Artykuły w czasopismach na temat „Geology South Australia Tirrawarra Field”

Sedimentological analysis of cored sections within the Merrimelia Formation (basal Gidgealpa Group, Cooper Basin, S.A.) reveals a complex glacigenic environment, including glacio-lacustrine, deltaic, shorezone, fluvial, aeolian and other terrestrial facies. These facies are observed within terminoglacial and proglacial environments, and interfinger constantly throughout the Merrimelia Formation, exhibiting rapid environment change related to position of the ice sheet. Detailed sedimentological and petrological analysis, suggests that Tirrawarra sandstone-type facies belongs within the Merrimelia depositional realm. Provenance data indicates that the lithic component of the Tirrawarra Sandstone, is sourced from reworked Merrimelia coeval depositional facies. A high proportion of labile grains, which are commonly observed in the Merrimelia Formation, are only observed rarely in the Tirrawarra Sandstone (sensu stricto). It is proposed that the fluvial sandstones of the Merrimelia Formation are part of the same fluvial deposystem as the Tirrawarra Sandstone (sensu stricto) and the two sandstone sequences are the natural progression of coarsening sediment as more detritus was released from melting glaciers. It is suggested that there no longer remains any sedimentological, stratigraphical or petrographical reasons why the Tirrawarra Sandstone should not be included within the Merrimelia Formation. It is further proposed that all the braided glacio- fluvial sandstones within the Merrimelia Formation and Tirrawarra Sandstone (sensu stricto) be grouped together as 'Tirrawarra-type' facies within the Merrimelia glacigenic domain.The concept that the glacio-fluvial sandstones within the Merrimelia Formation are of the same genetic origin as the Tirrawarra Sandstone (sensu stricto), must point to the economic potential of similar sandstones found throughout the Merrimelia Formation. The thickness, sediment style and lateral extent of the proglacial braidplains is controlled by the duration of glacial melting. The Merrimelia Formation reveals a sequence of major freezing and thawing episodes with the overlying Patchawarra Formation representing the cessation of glacial influence in the Cooper Basin. Therefore, the youngest 'Tirrawarra-type' sandstone facies found at the top of the Merrimelia Formation is likely to contain the least amount of labile grains, a highly rigid siliceous framework and will be well sorted. The risk of lower reservoir quality increases down section where, with time, freezing dominated over thawing and the sediments were less rinsed, and where the resultant sandstones are more likely to be thin, more poorly sorted and chemically immature with a high proportion of labile framework grains. Thus compositional variation, controlling the diagenetic overprint, together with sandstone facies and bedform style exert profound control on the reservoir quality in the Tirrawarra-Moorari Field area, on potential gas reservoirs in the Merrimelia Formation.

Robert Bedford (1874–1951), based in the isolated community of Kyancutta in South Australia, was a unique contributor to world geology, specifically in the field of meteorites and fossil archaeocyatha. Born Robert Arthur Buddicom in Shropshire, UK, he was an Oxford graduate who worked as a scientist in Freiberg, Naples, Birmingham and Shrewsbury as well as with the Natural History Museum, Kensington and the Plymouth Museum in the United Kingdom. He was a Fellow of the Geological Society of London, 1899–1910. In 1915, Buddicom changed his surname to Bedford and relocated to South Australia. During the 1920s, Bedford expanded his geological interests with the establishment of a public museum in Kyancutta in 1929. This included material previously collected and stored in the United Kingdom before being sent to Australia. Bedford was very successful in collecting material from the distant Henbury meteorite craters in Australia's Northern Territory, during three separate trips in 1931–1933. He became an authority on meteorites with much Henbury material being sent to the British Museum in London. However, Bedford's work on, and collecting of, meteorites resulted in a serious rift with the South Australian scientific establishment. Bedford is best known amongst geologists for his five taxonomic papers on the superbly preserved lower Cambrian archaeocyath fossils from the Ajax Mine near Beltana in South Australia's Flinders Ranges with field work commencing in about 1932 and extending until World War II. This research, describing thirty new genera and ninety-nine new species, was published in the Memoirs of the Kyancutta Museum, a journal that Bedford personally established and financed in 1934. These papers are regularly referenced today in international research dealing with archaeocyaths.

The Tubridgi Gas Field is located in the south of the Barrow Sub-basin, onshore in the Carnarvon Basin, Western Australia. The accumulation was discovered by Pan Pacific Petroleum NL in June 1981 with the drilling of the Tubridgi-1 well. Subsequent to Tubridgi-1, eight appraisal wells have been drilled, six of which were successful. The latest wells, Tubridgi-7 and-8, drilled in September 1990 by current operator Doral Resources NL, have enabled geological and petrophysical models for the field to be refined. These models were utilised for reserve determinations which were used to negotiate gas supply contracts and secure project financing to ensure the fields successful commercial development. Tubridgi gas is trapped within a broad, low relief, northeast-trending anticlinal closure. Reservoirs for the accumulation are the Middle to Upper Triassic Mungaroo Formation, Upper Cretaceous Flacourt Formation of the Barrow Group and Birdrong Sandstone of the Cretaceous Winning Group. All three units exhibit porosities averaging 29-30 per cent, with permeabilities of 3-16 D in the Mungaroo and Flacourt Formations and 157 mD in the Birdrong Sandstone. Vertical seal for the accumulation is the Muderong Shale of the Winning Group.The Tubridgi Gas Field is the first onshore Carnarvon Basin hydrocarbon accumulation to be commercially developed. Gas production into the Dampier-to-Bunbury Natural Gas Pipeline commenced on 26 September 1991 and within one month had reached contract volumes averaging 22 MMCFD (623 000 m3/d). Field life is anticipated to be ten years.

The colonial artist Eugene von Guérard travelled extensively throughout south-eastern Australia sketching thousands of views during his three-decade-long sojourn in Australia. His field drawings are renowned for their fidelity to nature and observational accuracy, but the validity of the latter claim depends on comparing drawings with the view at the sites where he sketched. The location of the view in some artworks, such as Mount Kosciusko, seen from the Victorian Border, has eluded art historians and aficionados who have ventured into the field. This article discusses the collation of clues from historical narratives, maps and surveying techniques to limit the search area for the vantage point where he sketched the view on which he based his painting of the Kosciuszko massif. Novel use of spatial technology utilising satellite imagery, Global Positioning System (GPS) and Shuttle Radar Topography Mission (SRTM) data, particularly digital elevation models, to locate the actual site is explored, and the topographical accuracy of his sketches evaluated when compared with photographs taken from close to the site. Finally, the potential value of using spatial technology in art history field work is discussed.

The distribution of heterobranch sea slugs is generally poorly documented at a regional scale. Thus, it is currently difficult to quantify biodiversity, identify endemic and invasive species, and track range shifts at scales relevant to conservation management. For Lord Howe Island, which lies ~600 km east of the New South Wales (NSW) mid-north coast, data from a range of taxa indicate high biodiversity and endemism, but this has not been examined for heterobranch sea slugs. To address this deficit, we collated occurrence data on sea slugs from both private and public sources, including museum records, scientific literature, field guides and citizen science activities. A total of 186 nominal (formally described) species in 82 genera and 31 families were identified from intertidal and subtidal habitats. Of these, two species are endemic to Lord Howe Island, two have not been recorded elsewhere in Australia, and 28 have not been recorded on the mainland coast of NSW. These results support studies of other taxa suggesting that the relative isolation of the island has facilitated the development of diverse and unique assemblages. However, this isolation is moderated by larval transport from surrounding regions, resulting in considerable overlap of the species pool with the mainland coast of NSW and tropical areas to the north.

ABSTRACT This study documents the growth of a megaflap along the flank of a passive salt diapir as a result of the long-lived interaction between sedimentation and halokinetic deformation. Megaflaps are nearly vertical to overturned, deep minibasin stratal panels that extend multiple kilometers up steep flanks of salt diapirs or equivalent welds. Recent interest has been sparked by well penetrations of unidentified megaflaps that typically result in economic failure, but their formation is also fundamental to understanding the early history of salt basins. This study represents one of the first systematic characterizations of an exposed megaflap with regards to sub-seismic sedimentologic, stratigraphic, and structural details. The Witchelina diapir is an exposed Neoproterozoic primary passive salt diapir in the eastern Willouran Ranges of South Australia. Flanking minibasin strata of the Top Mount Sandstone, Willawalpa Formation, and Witchelina Quartzite, exposed as an oblique cross section, record the early history of passive diapirism in the Willouran Trough, including a halokinetically drape-folded megaflap. Witchelina diapir offers a unique opportunity to investigate sedimentologic responses to the initiation and evolution of passive salt movement. Using field mapping, stratigraphic sections, petrographic analyses, correlation diagrams, and a quantitative restoration, we document depositional facies, thickness trends, and stratal geometries to interpret depositional environments, sequence stratigraphy, and halokinetic evolution of the Witchelina diapir and flanking minibasins. Top Mount, Willawalpa, and Witchelina strata were deposited in barrier-bar-complex to tidal-flat environments, but temporal and spatial variations in sedimentation and stratigraphic patterns were strongly influenced from the earliest stages by the passively rising Witchelina diapir on both regional (basinwide) and local minibasin scales. The salt-margin geometry was depositionally modified by an early erosional sequence boundary that exposed the Witchelina diapir and formed a salt shoulder, above which strata that eventually became the megaflap were subsequently deposited. This shift in the diapir margin and progressive migration of the depocenter began halokinetic rotation of flanking minibasin strata into a megaflap geometry, documenting a new concept in the understanding of deposition and deformation during passive diapirism in salt basins.

The South Pepper field, discovered in 1982, is located 30 km southwest of Barrow Island in the offshore portion of the Barrow Sub-basin, Western Australia. The oil and gas accumulation occurs in the uppermost sands of the Lower Cretaceous Barrow Group and the overlying low permeability Mardie Greensand Member of the Muderong Shale.The hydrocarbons are trapped in one of several fault closed anticlines which lie on a high trend that includes the North Herald, Pepper and Barrow Island structures. This trend is postulated to have formed during the late Valanginian as the result of differential compaction and drape over a buried submarine fan sequence. During the Turonian the trend acted as a locus for folding induced by right-lateral wrenching along the sub-basin edge. Concurrent normal faulting dissected the fold into a number of smaller anticlines. This essentially compressional tectonic phase contrasted with the earlier extensional regime which was associated with rift development during the Callovian. A compressional tectonic event in the Middle Miocene produced apparent reverse movement on the South Pepper Fault but only minor changes to the structural closure.Geochemical and structural evidence indicates at least two periods of hydrocarbon migration into the top Barrow Group - Mardie Greensand reservoir. The earlier occurred in the Turonian subsequent to the period of wrench tectonics and involved the migration of oil from Lower Jurassic Dingo Claystone source rocks up the South Pepper Fault. This oil was biodegraded before the second episode of migration occurred after the Middle Miocene tectonism. The later oil is believed to have been sourced by the Middle to Upper Jurassic Dingo Claystone. Biodegradation at this stage ceased or became insignificant due to temperature increase and reduction of meteoric water flow. Gas-condensate, sourced from Triassic or Lower Jurassic sediments may have migrated into the structure with this second oil although a more recent migration cannot be ruled out.The proposed structural and hydrocarbon migration history fits regional as well as local geological observations for the Barrow Sub-basin. Further data particularly from older sections of the stratigraphic column within the area are needed to refine the interpretation.

The share of global hydrocarbon production from ‘aging’ assets is increasing, whereas global demand for energy continues to increase at 1–2% per year (IEA 2019). In 2018, the International Energy Agency estimated the global average production decline at 4% per annum (Gould and McGlade 2018). Production from many of Australia’s established basins, such as the Cooper–Eromanga basin and the North West Shelf, is dominated by aging assets. To arrest this decline, actions must be taken to meet global demand for oil and gas, sustain production and underpin shareholder expectations of a return on their investment. Arresting field decline is a multifaceted problem. A single fix, whether technological or operational, will not maximise production or asset value. Any project to arrest field decline, grow production or (re)develop a field must be considered in its entirety, as an integrated system, by a multidisciplinary team. In addition, and critical to success, the required outcome must be clearly established and committed to by field owners, consultants and staff assigned to the project. This paper demonstrates how using a committed, outcome-focused approach, an integrated project team identified field redevelopment opportunities that significantly increased estimated ultimate recovery in an aging oilfield (that had already produced more than 70–80% of the developed resource) in the Cooper–Eromanga basin, South Australia. Factors critical to success were: (1) a commitment to look at all aspects of the field, from geology and geophysics, through the completion, well and field performance and operational infrastructure to identify development opportunities; (2) an ability to be agile, cycling quickly through the workflow as new information became available; (3) dedicated resources, clear communication and a commitment to integrated work across consultant and staff resources; and (4) management support.

Abstract The role of the Cathaysia Block, South China, and its linkage with orogenesis in the Rodinia and Gondwana supercontinents remain unresolved because of uncertainties in its paleoposition in supercontinental reconstructions. The lithostratigraphic, geochronologic, geochemical (including isotopic), and paleocurrent data on late Neoproterozoic to early Paleozoic sub-basins in the Cathaysia Block reveal spatio-temporal, tectono-sedimentary, and provenance diversity that show linkages with previously adjacent terranes and orogens in East Gondwana. An abundance of siliceous and conglomeratic rocks, local unconformities, and pinch-out in certain layers indicate a late Cryogenian proximal deposition, late Ediacaran transgression, and Middle Cambrian uplift. Cryogenian to early Ordovician strata contain predominantly 1000–900 Ma (late Grenvillian age) detrital zircon population, whereas 1300–1050 Ma (early Grenvillian age) zircons are only dominant in strata earlier than late Ediacaran. Besides, 850–700 Ma zircons are the most prominent group in the Middle Cambrian strata along with an occasional increase in the 650–500 Ma (Pan-African age) zircons. The Grenvillian age zircon groups exhibit significant sediment input from the eastern Indian terrane (990–950 Ma) and western Australia (1300–1050 Ma), underlining the fact that the Cathaysia Block was located between these two terranes in the northern part of East Gondwana. The diminishing contribution of early Grenvillian components in the late Ediacaran strata can be linked to the Pinjarra Orogeny (550–520 Ma), which led to uplift that blocked the transport of detritus from Australia. Middle Cambrian provenance variation with high abundance of 850–700 Ma components indicates the presence of intrinsic sediment from the Wuyishan terrane of South China. Given that the Cathaysia Block was a passive continental margin, this change was caused by the uplift of the southeastern Cathaysia Block, which was related to the far-field stress effects of the late phase of the Kuunga Orogeny (530–480 Ma). The decrease in abundance of early Grenvillian and Pan-African zircons in space implies that they were transported into the basins through independent drainage systems. This is consistent with the local and temporal variations in paleocurrent orientations during the Cambrian, further implying diverse and complex drainage systems in the southwestern Cathaysia Block during this period.

Abstract Field evidence from the Pilbara craton (Australia) and Kaapvaal craton (South Africa) indicate that modern tectonic processes may have been operating at ca. 3.2 Ga, a time also associated with a high density of preserved Archaean impact indicators. Recent work has suggested a causative association between large impacts and tectonic processes for the Hadean. However, impact flux estimates and spherule bed characteristics suggest impactor diameters of <100 km at ca. 3.5 Ga, and it is unclear whether such impacts could perturb the global tectonic system. In this work, we develop numerical simulations of global tectonism with impacting effects, and simulate the evolution of these models throughout the Archaean for given impact fluxes. We demonstrate that moderate-size (∼70 km diameter) impactors are capable of initiating short-lived subduction, and that the system response is sensitive to impactor size, proximity to other impacts, and also lithospheric thickness gradients. Large lithospheric thickness gradients may have first appeared at ca. 3.5–3.2 Ga as cratonic roots, and we postulate an association between Earth’s thermal maturation, cratonic root stability, and the onset of widespread sporadic tectonism driven by the impact flux at this time.

Regional geophysics research provides for prospect assessment of Timor-Leste, part of the Southeast Asia Archipelago in a region embracing the Banda Arc, Timor Island, and the northwest Australia Gondwana continental margin edge. Timor Island is a microcontinent with several distinct tectonic provinces that developed initially by rifting and drifting away from the Australian Plate. A compressive convergence began in the Miocene whereby the continental edge of the large craton collided with the microcontinent, forming a subduction zone under the island. The bulk of Timor Island consists of a complex mélange of Tertiary, Cretaceous, Jurassic, Triassic, Permian, and volcanic features over a basal Gondwana craton. Toward the north, the offshore consists of a Tertiary minibasin facing the Banda Arc Archipelago, with volcanics interspersed onshore with the basal Gondwana pre-Permian. A prominent central overthrust nappe of Jurassic and younger layers makes up the mountains of Timor-Leste, terminating south against an accretionary wedge formed by this ongoing collision of Timor and Australia. The northern coast of the island is part of the Indonesian back arc, whereas the southern littoral onshore plus shallow waters are part of the accretionary prism. Deepwater provinces embrace the Timor Trough and the slope of the Australian continental margin being the most prospective region of Timor-Leste. Overall crust and mantle tectonic structuring of Timor-Leste is interpreted from seismic and potential field data, focusing mostly on its southern offshore geology where hydrocarbon prospectivity has been established with interpretation of regional seismic data and analyses of gravity, magnetic, and earthquake data. Well data tied to seismic provides focal points for stratigraphic correlation. Although all the known producing hydrocarbon reservoirs of the offshore are Jurassic sands, interpretation of Permian and Triassic stratigraphy provides knowledge for future prospect drilling risk assessment, both onshore and offshore.

Coal seam gas (CSG), also known as coalbed methane (CBM), is an important source of gas supply to the liquefied natural gas (LNG) exporting facilities in eastern Australia and to the Australian domestic market. In late 2018, Australia became the largest exporter of LNG in the world. 29% of the country’s LNG nameplate capacity is in three east coast facilities that are supplied primarily by coal seam gas. Six geological basins including Bowen, Sydney, Gunnedah, Surat, Cooper and Gloucester host the majority of CSG resources in Australia. The Bowen and Surat basins contain an estimated 40Tcf of CSG whereas other basins contain relatively minor accumulations. In the Cooper Basin of South Australia, thick and laterally extensive Permian deep coal seams (>2 km) are currently underdeveloped resources. Since 2013, gas production exclusively from deep coal seams has been tested as a single add-on fracture stimulation in vertical well completions across the Cooper Basin. The rates and reserves achieved since 2013 demonstrate a robust statistical distribution (>130 hydraulic fracture stages), the mean of which, is economically viable. The geological characteristics including coal rank, thickness and hydrogeology as well as the present-day stress pattern create favourable conditions for CSG production. Detailed analyses of high-resolution borehole image log data reveal that there are major perturbations in maximum horizontal stress (SHmax) orientation, both spatially and with depth in Australian CSG basins, which is critical in hydraulic fracture stimulation and geomechanical modelling. Within a basin, significant variability in gas content and permeability may be observed with depth. The major reasons for such variabilities are coal rank, sealing capacity of overlying formations, measurement methods, thermal effects of magmatic intrusions, geological structures and stress regime. Field studies in Australia show permeability may enhance throughout depletion in CSG fields and the functional form of permeability versus reservoir pressure is exponential, consistent with observations in North American CSG fields.

Enhancements to traditional catchment-scale water quality assessments can be realized by leveraging geographical information systems (GIS) for both field data collection and hydrologic and water quality (H/WQ) modeling. In this study, we describe a GIS-based data collection system for geo-referenced environmental sampling utilizing mobile, wireless and Internet technologies. Furthermore, sampled field data is combined with historical measurements within a GIS-based semi-distributed watershed model for simulating water quantity and quality in a large regional catchment. The GIS-based sampling and modeling system is intended to streamline water quality assessments as compared to current practices. We describe an application and field study in the Williams River, New South Wales, Australia designed to assess the impacts of point and non-point source pollution on water quality. Historical data were utilized for calibrating and validating the Hydrologic Simulation Program – Fortran (HSPF) with the BASINS GIS interface over the 1988–2000 period. Results from the study indicate that short-duration, spatially extensive field campaigns provide useful data for enhancing modeling studies based on historical measurements at sparse sites. In addition, the study suggests that the conjunctive use of data collection and modeling is a step towards real-time integration of field data in hydrologic and water quality modeling efforts.

The aim of this work was to develop a risk map for boron (B) deficiency in the grain cropping regions of Western Australia (WA), whilst avoiding the high costs associated with direct B measurements for an area as vast as the south-west of WA. The study firstly determined relationships between 0.01 m CaCl2-extractable soil B levels and readily available data on soil properties and parent materials for Reference Soils of south-west Australia and secondly assembled direct evidence of B deficiency risk from surveys of farmers’ crops and soils and from glasshouse experiments. Across 73 Reference Soils, there was a positive relationship between 0.01 m CaCl2-extractable soil B levels and clay (r 2 = 0.50) and pH (r 2 = 0.43) in the surface horizon. Soils containing <0.5 mg B/kg generally had <5% clay and pH CaCl2 <5.5. Plant and soil analysis surveys in farmers’ fields revealed 10–20% of fields had B levels below tentative critical levels. In a glasshouse experiment, B response in oilseed rape was obtained in 4 sandy acid soils, all developed on sandstone parent materials. From this prior evidence of B deficiency, spatial data layers for surface soil pH, subsurface pH, surface clay level, and geology in south-western Australia were weighted and combined using the Dempster-Shafer weight of evidence model to map B-deficiency risk. The weightings of evidence layers were revised to increase the correspondence between predicted areas of high risk and field areas with measured low B or B deficiency from a validation dataset. The model helps overcome the high cost associated with direct B measurements for risk mapping. A similar approach may have value for mapping risk of other deficiencies of relevance to agriculture.

Cultus Petroleum N.L. began exploration in petroleum permit EPP 23 of the offshore Otway Basin in December 1987. The permit was sparsely explored, containing only 2 wells and poor quality seismic data. A regional study was made taking into account the shape of the basin and the characteristics of the major seismic sequences. A prospective trend was recognised, running roughly parallel to the present shelf edge of South Australia. A new seismic survey was orientated over this prospective trend. The parameters were designed to investigate the structural control of the prospects in the basin. To improve productivity during the survey, north-south lines had to be repositioned due to excessive swell noise on the cable. The new line locations were kept in accordance with the structural model. Field displays of the raw 240 channel data gave encouraging results. Processing results showed this survey to be the best quality in the area. An FK filter was designed on the full 240 channel records. Prior to wavelet processing, an instrument dephase was used to remove any influence of the recording system on the phase of the data. Close liaison was kept with the processing centre over the selection of stacking velocities and their relevance to the geological model. DMO was found to greatly improve the resolution of steeply dipping events and is now considered to be part of the standard processing sequence for Otway Basin data. Seismic data of a high enough quality for structural and stratigraphic interpretation can be obtained from this basin.

ABSTRACT Quantitative analysis of quartz microtextures by means of scanning electron microscopy (SEM) can reveal the transport histories of modern and ancient sediments. However, because workers identify and count microtextures differently, it is difficult to directly compare quantitative microtextural data analyzed by different workers. As a result, the defining microtextures of certain transport modes and their probabilities of occurrence are not well constrained. We used principal-component analysis (PCA) to directly compare modern and ancient aeolian, fluvial, and glacial samples from the literature with nine new samples from active aeolian and glacial environments. Our results demonstrate that PCA can group microtextural samples by transport mode and differentiate between aeolian transport and fluvial and glacial transport across studies. The PCA ordination indicates that aeolian samples are distinct from fluvial and glacial samples, which are in turn difficult to disambiguate from each other. Ancient and modern sediments are also shown to have quantitatively similar microtextural relationships. Therefore, PCA may be a useful tool to constrain the ambiguous transport histories of some ancient sediment grains. As a case study, we analyzed two samples with ambiguous transport histories from the Cryogenian Bråvika Member (Svalbard). Integrating PCA with field observations, we find evidence that the Bråvika Member facies investigated here includes aeolian deposition and may be analogous to syn-glacial Marinoan aeolian units including the Bakoye Formation in Mali and the Whyalla Sandstone in South Australia.

Removal of contaminants from groundwater using permeable reactive barriers (PRBs) is a cost-effective and popular engineering solution used throughout the world. Dissolved pollutants in groundwater are removed through geochemical processes that make PRBs effective for different types of contaminants. In achieving this, it is vital to determine the optimum width of the PRB to allow adequate residence time within the barrier and to establish its longevity. For this purpose, both field monitoring and geochemical modelling were conducted for a trial PRB located in the Shoalhaven Floodplain, south of Wollongong in Australia. In this study, the optimum PRB width is evaluated numerically, based on the neutralization effectiveness, i.e., when acidic groundwater travels through the alkaline PRB. A model developed previously has been extended considering the residence time, reaction kinetics, mineral precipitation–induced reduction in porosity and hydraulic conductivity, influent concentrations of the contaminants, and groundwater flow velocity. Longevity of the PRB is determined with respect to groundwater flow rates and amount of reactive material consumed.

A system of surcharge load combined with vertical drains to speed up consolidation of soft soil by reducing the drainage path is one of the most efficient and economical ground improvement techniques. In the field, conventional theories including smear zone have been commonly employed to predict the radial consolidation behaviour induced by vertical drains in soft clay. One of the key parameters in conventional analysis is the use of mean coefficient of volume compressibility and soil permeability, which are often assumed to be constant. The effect of drain installation on the soil compressibility of the in situ clay structure is often ignored. Laboratory testing has shown that the soil compressibility and permeability can vary nonlinearly over a considerable range of applied surcharge pressure, and both these properties can be affected during the drain installation. This study presents a mathematical model of radial consolidation via vertical drains incorporating the variations of soil compressibility and permeability as well as highlighting the effects of drain installation on those parameters. The main differences between the proposed and conventional models are elucidated, in terms of stress history and preloading (surcharge) pressure. The effects of preconsolidation pressure and the magnitude of applied preloading are examined through the dissipation of average excess pore pressure and associated settlement. Supported by experimental observations, the proposed theory is validated with field data of a selected case study in the town of Ballina, New South Wales, Australia.

Abstract Introduction and geodynamic setting. – Syn-rift exhumation of mantle rocks in a continental breakup zone was highlighted along the present-day west Iberian passive margin [e.g. Boillot et al., 1988, 1995; Whitmarsh et al., 1995, 2001; Beslier et al., 1996; Brun and Beslier, 1996; Boillot and Coulon, 1998; Krawczyk et al., 1996; Girardeau et al., 1998] and along the fossil Tethyan margins [e.g. Froitzheim and Manatschal, 1996; Manatschal and Bernoulli, 1996; Marroni et al., 1998; Müntener et al., 2000; Desmurs et al., 2001]. Along the west Iberian margin, serpentinized peridotite and scarce gabbro and basalt lay directly under the sediments, over a 30 to 130 km-wide transition between the thinned continental crust and the first oceanic crust [Girardeau et al., 1988, 1998; Kornprobst and Tabit, 1988; Boillot et al., 1989; Beslier et al., 1990, 1996; Cornen et al., 1999]. The formation of a wide ocean-continent transition (OCT), mostly controlled by tectonics and associated with an exhumation of deep lithospheric levels, would be an essential stage of continental breakup and a characteristic of magma-poor passive margins. The southwest Australian margin provides an opportunity to test and to generalize the models proposed for the west Iberian margin, as both margins present many analogies. The south Australian margin formed during the Gondwana breakup in the Mesozoic, along a NW-SE oblique extension direction [Willcox and Stagg, 1990]. From north to south, the continental slope is bounded by (1) a magnetic quiet zone (MQZ) where the nature of the basement is ambiguous [Talwani et al., 1979; Tikku and Cande, 1999; Sayers et al., 2001], (2) a zone where the basement shows a rough topography associated with poorly expressed magnetic anomalies [Cande and Mutter, 1982; Veevers et al., 1990; Tikku and Cande, 1999; Sayers et al., 2001], and which is the eastward prolongation of the Diamantina Zone, and (3) an Eocene oceanic domain. The continental breakup zone is believed to be located near or at the southern edge of the MQZ [Cande and Mutter, 1982; Veevers et al., 1990; Sayers et al., 2001]. Breakup is dated at 125 Ma [Stagg and Willcox, 1992], 95 ± 5 Ma [Veevers, 1986] or at 83 Ma [Sayers et al., 2001], and followed by ultra-slow seafloor spreading until the Eocene (43 Ma), and fast spreading afterwards [Weissel and Hayes, 1972; Cande and Mutter, 1982; Veevers et al., 1990; Tikku and Cande, 1999]. The western end of the margin (fig. 1) is starved and bounded in the OCT by basement ridges where peridotite, gabbro and basalt were previously dredged [Nicholls et al., 1981]. Altimetry data [Sandwell and Smith, 1997] show that some of these ridges are continuous over 1500 km along the OCT of the south Australian margin and of the conjugate Antarctic margin. The objectives of the MARGAU/MD110 cruise (May-June 1998; [Royer et al., 1998]; fig. 2) were to define the morpho-structure and the nature and evolution of the basement in the SW Australian OCT. An area of 180 000 km2 was explored with swath bathymetry. Gravimetric data (11382 km) were simultaneously recorded whereas few single channel seismic (1353 km) and magnetic (5387 km) data were obtained due to technical difficulties. Crystalline basement rocks, made of varied and locally well-preserved lithologies, were dredged at 11 sites located on structural highs. Main results. – The bathymetric map unveils three E-W domains (fig. 2). From north to south, they are the continental slope of Australia, prolonged westward by that of the Naturaliste Plateau, a 160 km-wide intermediate flat sedimented area corresponding to the MQZ, and a 100 km-wide zone of rough E-W oriented topography which continues the Diamantina Zone (fig. 3). The first two domains are cut through in three segments by two major fracture zones (FZ), the Leeuwin FZ along the eastern side of the Naturaliste Plateau, and the Naturaliste FZ along its western flank. These NW-SE trending FZ terminate north of the E-W trending fabric of the Diamantina Zone. Accordingly, extension occurred along the NW-SE direction during the formation of the slope and of the MQZ, and then turned to N-S during the formation of the Diamantina Zone. In the Diamantina Zone, the mantle rocks dredged at Site MG-DR02 are mainly lherzolites, rich in pyroxenitic micro-layers, and pyroxenites. They contain spinel rimmed by plagioclase and locally coronas of olivine + plagioclase between opx and spinel, which suggest that they underwent some subsolidus reequilibration in the plagioclase field (fig. 4C). Westward (Site DR09), the mantle rocks are harzburgitic, with lesser pyroxenitic bandings and no plagioclase. The rocks have coarse-grained porphyroclastic textures that are locally overprinted by narrow mylonitic shear bands, and then by a cataclastic deformation, which indicate decreasing temperatures and increasing stresses during their evolution. Basalts were sampled at Sites MG-DR01, −04, −05, and together with gabbros at Sites MG-DR02, -03, -09. They have a transitional composition as shown by their REE patterns, except one sample from site MG-DR-05 which is an alkaline basalt (fig. 5). The gabbros are clearly intrusive in the peridotite at Sites DR02 and -09. They contain olivine and clinopyroxene (cpx) at Site DR02, cpx, plagioclase and hornblende at Site DR03, and cpx and amphibole or orthopyroxene or olivine at Site DR09 (fig. 4D). At that site, a tonalite containing K-feldspar and biotite and alkaline in composition (fig. 5), has also been sampled. All these plutonic rocks display either their primary magmatic textures or secondary porphyroclastic ones that are locally overprinted by mylonitic shear zones (fig. 4E). Retrograde minerals of amphibolite to greenschist facies developed during the deformation. The basalts are clearly intrusive in the gabbros at Site DR03. They are altered and exhibit porphyric textures with abundant plagioclase and plagioclase + olivine phenocrysts at Sites DR03, -04, -08, -10, and have a transitional composition (fig. 5). The nature and evolution of the peridotites and associated gabbros are compatible with an exhumation under a rift zone, on both sides of the Leeuwin FZ. It includes a mylonitic deformation which attests that these rocks underwent a shearing deformation under lithospheric conditions, in probable relation with their exhumation during the early stages of the oceanic opening. The crustal rocks are represented only by intrusive gabbros and by transitional basalts. In the MQZ, the peridotites recovered at Site MG-DR06 are mainly spinel and plagioclase lherzolites (fig. 4B) and a few pyroxenites (fig. 4A) with high temperature porphyroclastic textures. Their discovery indicates that the basement in the MQZ is not exclusively formed of thinned continental crust. Lavas sampled westward of the Leeuwin FZ at Site DR10 have also transitional compositions (fig. 5). On the Australian slope, samples dredged at Site MG-DR07 are continental quartz-bearing rocks (mostly gneisses and rare granites), some showing a high grade paragenesis (upper amphibolite to granulite facies) marked by the presence of K-feldspar, biotite, sillimanite and/or kyanite and garnet, and without primary muscovite (fig. 4G). Some of these rocks underwent an intense mylonitic shear deformation followed by post-tectonic recrystallisation or migmatization. Depending on the age of the high grade evolution (metamorphism and shearing), these rocks document either the syn-rift exhumation of lower continental crust, or the formation of the older Australian craton. On the slope of the Naturaliste Plateau, at Site DR11, rocks of oceanic origin (gabbro-diorites/dolerite/basalt; fig. 4F) were dredged together with acid rocks (gneiss and granites) of probable continental origin, some having a quartz, K-feldspar, biotite and garnet metamorphic paragenesis (fig. 4H). At that site, the transitional basalts intrude the gabbros and associated dolerites. The presence of metamorphic acid rocks indicate that the Naturaliste Plateau is likely a continental fragment that was later intruded by mafic rocks, whose origin and ages of intrusion have to be determined. Discussion and conclusions. – The retrograde tectono-metamorphic evolution of the peridotites recovered in the MQZ, which includes a reequilibration in the plagioclase field (marked by the development of olivine and plagioclase after spinel and pyroxene), is compatible with an exhumation under a rift zone [Girardeau et al., 1988; Kornprobst and Tabit, 1988; Cornen et al., 1999]. By analogy with the Iberia Abyssal Plain, the MQZ could represent a wide OCT where the mantle was exhumed and stretched mostly by amagmatic extension before the initiation of oceanic accretion [Beslier et al., 1996; Boillot and Coulon, 1998] (fig. 6). This hypothesis is supported by the tectonic structures (horsts and grabens) imaged in the seismic data over the MQZ [Boeuf and Doust, 1975]. Accordingly, the limit of the continental crust would be located at the foot of the slope, i.e. 160 km (or 250 km in the NW-SE extension direction) northward of the assumed location of the OCT at the southern edge of the MQZ. The age of the Australia-Antarctic breakup would thus be (1) older than that inferred from the magnetic anomalies (circa 95 Ma [Cande and Mutter, 1982; Veevers, 1986]), which would rather date the onset of oceanic accretion, and (2) older than the age of the breakup unconformity estimated as Santonian (83 Ma), further east, in the Great Australian Bight [Sayers et al., 2001]. The origin of the Naturaliste Plateau, continental or oceanic, is still disputed. The discovery of metamorphic rocks of probable continental origin on the southern flank of the Plateau (Site DR11) shows that it consists at least partially of rocks of the Gondwana continent. All the samples from the Diamantina Zone confirm that its basement is made of a peridotite-gabbro-basalt assemblage. The nature and age of the peridotites and of the associated magmas will help understanding the origin of this domain, which can result either from Neocomian seafloor spreading with further remobilization during the Australia-Antarctic separation, or from post-Neocomian ultra-slow seafloor spreading. Because of the omnipresence of extensive tectonic structures (fig. 3) and of the relatively small proportion of crustal rocks relative to the mantle rocks, we argue that the formation of the Diamantina Zone was mainly controlled by tectonics rather than by magmatic processes. In conclusion, the data collected along the southwest Australian margin during the MARGAU/MD110 survey evidence two major tectonic phases with formation of a wide OCT where abundant mantle rocks, in association with few mafic rocks, outcrop or lay directly beneath the sediments. The evolution of the crystalline rocks is compatible with an exhumation under a rift zone during a phase of magma-poor extension primarily controlled by tectonic processes. The domains where basement highs were sampled seem to be continuous over more than 1500 km eastward along the south Australian margin. Additional evidence on such large-scale structural continuity and on the nature of the associated basement highs may help generalizing the models for continental breakup and formation of non-volcanic passive margins, where oceanic accretion does not immediately follow continental breakup.

The Heazlewood-Luina-Waratah area is a prospective region for minerals in northwest Tasmania, Australia, associated with historically important ore deposits related to the emplacement of granite intrusions and/or ultramafic complexes. The geology of the area is poorly understood due to the difficult terrain and dense vegetation. We have constructed an initial high-resolution 3D geologic model of this area using constraints from geologic maps and geologic and geophysical cross sections. This initial model is improved upon by integrating results from 3D geometry and physical property inversion of potential field (gravity and magnetic) data, petrophysical measurements, and updated field mapping. Geometry inversion reveals that the Devonian granites in the south are thicker than previously thought, possibly connecting to deep sources of mineralization. In addition, we identified gravity anomalies to the northeast that could be caused by near-surface granite cupolas. A newly discovered ultramafic complex linking the Heazlewood and Mount Stewart Ultramafic Complexes in the southwest also has been modeled. This implies a greater volume of ultramafic material in the Cambrian successions and points to a larger obducted component than previously thought. The newly inferred granite cupolas and ultramafic complexes are targets for future mineral exploration. Petrophysical property inversion reveals a high degree of variation in these properties within the ultramafic complexes indicating a variable degree of serpentinization. Sensitivity tests suggest maximum depths of 2–3 km for the contact aureole that surrounds major granitic intrusions in the southeast, whereas the Heazlewood River complex is likely to have a deeper source up to 4 km. We have demonstrated the value of adding geologic and petrophysical constraints to 3D modeling for the purpose of guiding mineral exploration. This is particularly important for the refinement of geologic structures in tectonically complex areas that have lithology units with contrasting magnetic and density characteristics.

Environmental gradients or biophysical parameters such as climate, topography and geology drive landscape-scale vegetation structure, species distribution and productivity. These gradients have the potential to provide detailed, fine-scale spatial prediction of the accumulation of bushfire fuels and hence fire hazard by elucidating patterns in field information in a consistent and repeatable way. Rapid visual assessment of bushfire fuel hazard via ratings provides fire and land management agencies with a measure of the probability of first attack success and general suppression difficulty of bushfires at a location. This study used generalised additive modelling to examine how measures of fuel hazard, recorded for locations in New South Wales, Australia, varied in response to environmental gradients and whether these gradients could be used to predict fuel hazard at a landscape scale. We found that time since last fire, temperature and precipitation were strong predictors of fuel hazard. Our model predictions for fuel hazard outperformed current operational methods; however, both methods tended to overestimate lower fuel hazard and underestimate higher fuel hazard. Biophysical modelling of fuel hazard provides significant advancement for predicting fuel hazard. These models have the capability to be improved and developed as additional fuel hazard data, fire history mapping and remote sensing of environmental variables advance both spatially and temporally.

The Olympic Cu-Au Province is a metallogenic province in South Australia that contains one of the world’s most significant Cu-Au-U resources in the Olympic Dam deposit. The Olympic Cu-Au Province also hosts a range of other iron oxide-copper-gold (IOCG) deposits including Prominent Hill and Carrapateena. This paper reviews the geology of the Olympic Cu-Au Province by investigating the lithospheric architecture, geodynamic setting and alteration systematics. In addition, since the province is almost entirely buried by post-mineral cover, the sedimentary cover sequences are also reviewed. The Olympic Cu-Au Province formed during the early Mesoproterozoic, ca. 1.6 Ga and is co-located with a fundamental lithospheric boundary in the eastern Gawler Craton. This metallogenic event was driven in part by melting of a fertile, metasomatized sub-continental lithospheric mantle during a major regional tectonothermal event. Fluid evolution and multiple fluid mixing resulted in alteration assemblages that range from albite, magnetite and other higher temperature minerals to lower temperature assemblages such as hematite, sericite and chlorite. IOCG mineralisation is associated with both high and low temperature assemblages, however, hematite-rich IOCGs are the most economically significant. Burial by Mesoproterzoic and Neoproterozoic-Cambrian sedimentary successions preserved the Olympic Cu-Au Province from erosion, while also providing a challenge for mineral exploration in the region. Mineral potential modelling identifies regions within the Olympic Cu-Au Province and adjacent Curnamona Province that have high prospects for future IOCG discoveries. Exploration success will rely on improvements in existing potential field and geochemical data, and be bolstered by new 3D magnetotelluric surveys. However, drilling remains the final method for discovery of new mineral resources.

Abstract. In this work, the results of the analysis on total electron content (TEC) data before, during and after the geomagnetic storm of 8 September 2017 are reported. One of the responses to geomagnetic storms due to the southern vertical interplanetary magnetic field (Bz) is the enhancement of the electron density in the ionosphere. Vertical TEC (VTEC) from the Center for Orbit determination in Europe (CODE) along with a statistical method were used to identify positive and/or negative ionospheric storms in response to the geomagnetic storm of 8 September 2017. When analyzing the response to the storm of 8 September 2017 it was indeed possible to observe an enhancement of the equatorial ionization anomaly (EIA); however, what was unexpected was the identification of a local TEC enhancement (LTE) to the south of the EIA (∼40∘ S, right over New Zealand and extending towards the southeastern coast of Australia and also eastward towards the Pacific). This was a very transitory LTE that lasted approximately 4 h, starting at ∼ 02:00 UT on 8 September where its maximum VTEC increase was of 241.2 %. Using the same statistical method, comparable LTEs in a similar category geomagnetic storm, the 2015 St. Patrick's Day storm, were looked for. However, for the aforementioned storm no LTEs were identified. As also indicated in a past recent study for a LTE detected during the 15 August 2015 geomagnetic storm, an association between the LTE and the excursion of Bz seen during the 8 September 2017 storm was observed as well. Furthermore, it is very likely that a direct impact of the super-fountain effect along with traveling ionospheric disturbances may be playing an important role in the production of this LTE. Finally, it is indicated that the 8 September 2017 LTE is the second one to be detected since the year 2016.

Radiometric methods were used to investigate the radioactive properties of rocks in parts of southwestern Nigeria with a view to interpreting the geological structure and abundance of natural radioactive elements in the main type rocks. The airborne radiometric dataset of Ikole Sheet and ground radiometric data recorded from eight traverses in Akoko axis of the study area were processed. Results presented as maps and profiles displayed variations of high and low radioactive concentrations across the area. These maps showed moderate to very high concentrations and very low to low concentrations of the radioelements; uranium (4.5-13.0 ppm); (LLD-low limit of detection -3.0 ppm), Th (25.0-70.0 ppm); (8.5-16.0 ppm) and K (2.0-4.0 %); but the most often observed values are in the range 2.5-7.0 ppm, 22.0-30.0 ppm and 3.0-4.0% for U, Th, and K respectively. High concentrations imply that the rocks are crystalline, undeformed and are rich in feldspar and U-Th bearing minerals. While low radioactivity is attributed to varying geologic framework compositions; weathered materials or fluids formed as a result of intense metamorphism. The radiometric datasets proved valuable in delineating different rock types and serve as a complementary tool in identifying geochemical zoning of rocks in the area.ReferencesAjibade A.C. and Fitches W.R., 1988. The Nigerian Precambrian and the Pan-African Orogeny, Precambrian Geology of Nigeria, 45-53.Ajibade A.C., Woakes M. and Rahaman M.A., 1987.Proterozoic crustal development in Pan-African regime of Nigeria: In A. Croner (ed.) Proterozoic Lithospheric Evolution Geodynamics, 17, 259-231.Appleton J.D., Miles J.C.H., Green B.M.R, Larmour R., 2008. Pilot study of the application of Tellus airborne radiometric and soil geochemical data for radon mapping. Journal of Environmental Radioactivity, 99, 1687-1697.Arisekola T.M. and Ajenipa R.A., 2013. Geophysical data results preliminary application to uranium and thorium exploration. IAEA-CYTED-UNECE Workshop on UNFC-2009 at Santiago, Chile 9-12, July, 12.Bayowa O.G., Olorunfemi O.M., Akinluyi O.F. and Ademilua O.L., 2014.A Preliminary Approach to Groundwater Potential Appraisal of Ekiti State, Southwestern Nigeria. International Journal of Science and Technology (IJST), 4(3), 48-58.Bierwirth P.N., 1997. The use of airborne gamma-emission data for detecting soil properties.Proceedings of the Third International Airborne Remote Sensing Conference and Exhibition.Copenhagen, Denmark.Grasty R.L. and Multala J., 1991. A correlation technique for separating natural and man-made airborne gamma-ray spectra. In: Current Research, Part D, Geological Survey of Canada, 111-116.Grasty R.L., Minty B.R.S., 1995a. A guide to the technical specifications for airborne gamma ray surveys. Australian Geological Survey Organization, Record.Grasty R.L., Minty B.R.S., 1995b. The standardization of airborne gamma-ray surveys in Australia. Exploration Geophysics, 26, 276-283.IAEA, 1991. Airborne gamma ray spectrometer surveying, International Atomic Energy Agency, Technical Report Series, 323.IAEA, 2007.International Atomic Energy Agency. Safety Glossary, Terminology used in Nuclear Safety and Radiation Protection-2007 Edition.Jones H.A. and Hockey, 1964.The Geology of part of’ Southwestern Nigeria.Geological Survey, Nigeria bulletin, 31.Kearey P., Brooks M. and Hill I., 2002. An Introduction to Geophysical Exploration.3rd ed. Oxford: Blackwell Science, 262.Milsom J., 2003. Field Geophysics: The geological field guide series, John Milsom University College, London. Published by John Wiley and Sons Ltd. Third edition, 51-70.MontajTM Tutorial, 2004. Two - Dimensional frequency domain processing of potential field data.Nigeria Geological Survey Agency (NGSA), 2009. Geological map of Nigeria prepared by Nigeria Geological Survey Agency, 31, ShetimaMangono Crescent Utako District, Garki, Abuja, Nigeria.Omosanya K.O., Ariyo S.O., Kaigama U., Mosuro G.O., and Laniyan T.A., 2015. An outcrop evidence for polycyclic orogenies in the basement complex of Southwestern Nigeria. Journal of Geography and Geology, 7(3), 24-34.Oyawoye, M.O., 1972. The Basement Complex of Nigeria.In African Geology. T.F.J. Dessauvagie and A.J. Whiteman (Eds) Ibadan University Press, 67-99.Oyinloye A.O., 2011. Geology and Geotectonic Setting of the Basement Complex Rocks in Southwestern Nigeria: Implications on Provenance and Evolution. Earth and Environmental Sciences, 98-117. ISBN: 978-953-307-468-9.Rahaman M.A., 1981. Recent Advances in the Study of the Basement Complex of Nigeria.First Symposium on the Precambrian Geology of Nigeria, Summary.Rahaman M.A., Emofureta W.O. and Vachette M., 1983. The potassic-grades of the Igbeti area: Further evaluation of the polycyclic evolution of the Pan-African Belt in South-western Nigeria. Precambrian Resources, 22, 75-92.Woakes M., Rahaman M.A., Ajibade A.C., 1987. Some Metallogenetic Features of the Nigerian Basement. Journal of African Earth Sciences, 6(5), 655-664.

This study aims to describe the understanding of geography literacy and student experience with landscape recognition observations using an ethnometodology perspective. The subject of this study was the chairman of each landscape recognition practice group student geography education program from University of Jember. The results of this study that geography literacy has a dimension of relevance to geographic skills in representing contextual phenomena and places from landscape recognition observation activities. The results of both observational studies provide research experience, motivation, critical and scientific thinking skills for students represented in the mapping of the area. Keywords: Geography Literacy, Student Experience, Ethnometodology References Bogdan, R. And Biklen, S.K.(1998). Qualitative Research for Education: An introduction to theories and methods. Boston: Allyn and Bacon, Inc. Boogart II, Thomas A. (2001). The Powwer of Place: From Semiotics to Ethnogeography, Middle States Geograher, 2001, 34: 38-47. Boyle, A., Maguire, S., Martin, A., Milsom, C., Nash, R., Rawlinson, S., Turner, A., Wurthmann, S. & Conchie, S.(2007). Fieldwork is Good: The Student Perception and the Affective Domain, Journaal of Geography in Higher Education, 31(2), 299-317. Chappell, Adrian.(2007). Using Teaching Observations and Reflective Practice to Challenge Conventions and Conceptions of Teaching in Geography, Journal of Geography in Higher Education, 32(2), 257-268. Comber, Barbara.(2017). Literacy Geography and Pedagogy: Imagining Translocal Research Alliances for Educational Justice, Journal Literacy Research: Theory, Method, and Practice, Sagepub, University of South Australia, 66, 53-72. Cotton, Debby R.E., Stokes, Alison, & Cotton, Peter A.(2010).Using Observational Methods to Research the Student Experience, Journal of Geography in Higher Education, 34(3), 463-473. Denzin, Norman K. And Lincoln Yvonna S. (2008). Strategies of Qualitative Inquiry. California: Sage Publications, Inc. Fatchan, Achmad. (2015). Methodology Research Qualitative of Ethnography and Ethnometodology Approaches for Social Sciences. Yogyakarta: Ombak. Guertin, L., Stubbs, C., Millet, C., Lee, T., & Bodek, M.(2012). Enchancing Geographic and Digital Literacy with a Student Generated Course Portfolio in Google Earth, Journal of College Science Teaching, 42(2), 32-37. Hunter, Nancee.(2016). Assesing Sense of Place and Geo-literacy Indicatorc as Learning Outcomes of an International Teacher Professional Development Program, Dissertation, Porland State University. Johnston, B. And Webber, S. (2003). Information Literacy in Higher Education: a review and case study, Studies in Higher Education, 28 (3), 335-352. Levinson, S.C.(2003). Space in Language and Cognition: Explorations in Cognitive Disversity. New York: Cambridge University Press. Lloyd, Annemaree.(2006). Information Literacy Landscapes: an emerging picture, Journal of Documentation, 62 (5), 570-583. Miles, Matthew B, Huberman, A. Michael, and Saldana, Johnny.(2015). Qualitative Data Analysis A Methods Sourcebook. Thousand Oaks, CA: Sage Publications. Minca, Claudio.(2013). The Cultural Geographies of Landscape, Hungarian Geographical Bulletin 62(1), 47-62. National Research Council.(2005). Learning to Think Spatially. GIS as a Support System in the K12 Curriculum. Washington DC: National Research Council and National Academies Press. Ottati, Daniela F.(2015). Geographical Literacy, Attitudes, adn Experiences of Freshman Students: A Qualitative Study at Florida International University, Dissertation. Miami: Florida International University. Patton, M.Q.(2002). Qualitative Research and Evaluation Methods (3rd ed.). Thousand Oasks CA: Sage Publications. Stokes, A. & Boyle, A.P.(2009). The Undergraduate Geoscience Fieldwork Experience: Influencing Factors and Implications for Learning, in: S.J. Whitmeyer, D.W. Mogk & E.J. Pyle (Eds) Field Geology Education-Historical Perspectives and Modern Approach, 461, Geological Society of America, 313-321. Turner, S., & Leydon, J.(2012). Improving Geography Literacy among First Year Undergraduate Students: Testing the Effectivess of Online Quizzes, Journal of Geography, 111(2), 54-66.

The evolution of the northern margin of Gondwana, especially to the north of India and Australia, remains enigmatic. Much controversy concerns when and where the Tarim craton was amalgamated with northern Gondwana due to final closure of the North and South Altyn Oceans (two branches of the Proto−Tethys Ocean between southeastern Tarim and northern Gondwana). This study addressed these issues through systematic field-based zircon U-Pb dating and Hf-isotope analyses of early Paleozoic sedimentary rocks in the Altyn Tagh orogen. New dating results reveal depositional ages from ca. 494 to 426 Ma. Provenance tracing indicates the ca. 494−477 Ma samples were dominantly sourced from local Altyn Tagh areas to the south of the North Altyn Ocean, whereas the ca. 465−449 Ma samples are characterized by a significant increase in ca. 2.7−2.4 Ga, 2.0−1.7 Ga, and 840−780 Ma detrital zircons, indicating an augmented supply of detritus from the Tarim craton to the north of the North Altyn Ocean. This change indicates a major provenance shift from a single to multiple source regions between ca. 477 and 465 Ma, marking the timing of the final closure of the North Altyn Ocean. Zircon U-Pb and Hf-isotopic data from the ca. 444−426 Ma samples resemble those from the ca. 465−449 Ma samples, suggesting local sediment recycling related to a postcollisional regime. Considering the South Altyn Ocean and other branches of the Proto−Tethys Ocean, we infer that the entire Proto−Tethys Ocean might have been progressively closed at ca. 500−420 Ma, leading to the amalgamation of most East Asian blocks with northern Gondwana. Detrital zircon U-Pb and Hf-isotope comparisons indicate that Tarim shared a North Indian affinity with many East Asian terranes (such as North Qilian, North Qinling, South China, Indochina, South Qiangtang, etc.), rather than with Arabia-Iran or other terranes (e.g., Lhasa and Sibumasu) that were adjacent to western Australia along the northern margin of Gondwana.

The antiquity of the Australian landscape has long been the subject of debate, with some studies inferring extraordinary longevity (>108 myr) for some subaerial landforms dating back to the early Paleozoic. A number of early Permian glacial erosion surfaces in the Fleurieu Peninsula, southeastern Australia, provide an opportunity to test the notion of long-term subaerial emergence, and thus tectonic and geomorphic stability, of parts of the Australian continent. Here we present results of apatite fission track analysis (AFTA) applied to a suite of samples collected from localities where glacial erosion features of early Permian age are developed. Our synthesis of AFTA results with geological data reveals four cooling episodes (C1-4), which are interpreted to represent distinct stages of exhumation. These episodes occurred during the Ediacaran to Ordovician (C1), mid-Carboniferous (C2), Permian to mid-Triassic (C3) and Eocene to Oligocene (C4).The interpretation of AFTA results indicates that the Neoproterozoic−Lower Paleozoic metasedimentary rocks and granitic intrusions upon which the glacial rock surfaces generally occur were exhumed to the surface by the latest Carboniferous−earliest Permian during episodes C2 and/or C3, possibly as a far-field response to the intraplate Alice Springs Orogeny. The resulting landscapes were sculpted by glacial erosive processes. Our interpretation of AFTA results suggests that the erosion surfaces and overlying Permian sedimentary rocks were subsequently heated to between c. 60 and 80°C, which we interpret as recording burial by a sedimentary cover comprising Permian and younger strata, roughly 1 km in thickness. This interpretation is consistent with existing thermochronological datasets from this region, and also with palynological and geochronological datasets from sediments in offshore Mesozoic−Cenozoic-age basins along the southern Australian margin that indicate substantial recycling of Permian−Cretaceous sediments. We propose that the exhumation which led to the contemporary exposure of the glacial erosion features began during the Eocene to Oligocene (episode C4), during the initial stages of intraplate deformation that has shaped the Mt Lofty and Flinders Ranges in South Australia. Our findings are consistent with several recent studies, which suggest that burial and exhumation have played a key role in the preservation and contemporary re-exposure of Gondwanan geomorphic features in the Australian landscape.

Abstract Divergent genetic models have been proposed for clastic dominant (CD-type) massive sulfide Zn-Pb mineralization in the Proterozoic Carpentaria Zn Province. Due to varying degrees of tectonic overprint, it has been difficult to accurately constrain structural and paragenetic timing aspects of the CD-type genetic model, and the most basic timing constraints (syngenetic vs. epigenetic, synextension vs. syninversion) remain debated. The recently discovered Teena Zn-Pb deposit is hosted by an exceptionally well preserved subbasin that permits relative timing relationships to be well defined. Using a combination of geophysical, structural, sedimentological, and petrographic datasets, a new model for subbasin development and syndiagenetic hydrothermal replacement mineralization is developed for the Teena mineral system. At Teena, sulfide mineralization was deposited from lateral fluid flow beneath an impermeable seal several hundred meters below the paleosurface and maximum flood surface, after formation of fine-grained diagenetic pyrite (py1) and dolomite nodules. Sulfide mineralization resulted from syndiagenetic carbonate replacement and pore space cementation where thermochemical sulfate reduction took place. The sulfide mineralization is therefore partly cospatial but not cogenetic with its thick pyritic hanging wall, and its lateral alteration footprint is much smaller than predicted by sedimentary exhalative (SEDEX) models. An additional zone of low-grade Zn-Pb mineralization in the footwall W-Fold Shale Member represents a different style of mineralization not previously reported for Carpentaria CD-type Zn deposits: it is associated with strata-bound lenses of hydrothermal dolomite (HTD) that formed by both replacement and carbonate dissolution and infill, which yielded diverse cavity-infill textures that include coarse-bladed dolomite fans cemented by interstitial sphalerite, dolomite, and quartz. Volumetrically minor Zn mineralization is also present in a fault conduit hydrothermal breccia and in hanging-wall synorogenic vein sets derived by hydrothermal leaching and remobilization of Zn from the underlying mineralized zones. Whereas both the Teena and nearby McArthur River Zn-Pb deposits are located along the northern margin of the 3rd-order Hot Spring-Emu subbasin, they formed in separate 4th-order subbasins in association with local extensional growth faults. Growth fault movement in the Teena subbasin was initiated during deposition of the W-Fold Shale Member and persisted episodically until a weak structural disconformity associated with sedimentary facies regression developed in the Upper HYC unit. Shifting patterns in depocenter location, sedimentary facies development, mineralization, and alteration zonation are attributed to progressive growth and linkage of segments of a regionally anomalous ENE-trending, synsedimentary fault zone. Similar patterns of extensional subbasin development were repeated in other Zn-mineralized subbasins throughout the River supersequence across the northern Carpentaria Zn Province, and formed in response to a short-lived episode of north-northwest–south-southeast regional extension around ca 1640 ± 5 Ma, triggered by far-field subduction events.

This Tropospheric Ozone Assessment Report (TOAR) on the current state of knowledge of ozone metrics of relevance to vegetation (TOAR-Vegetation) reports on present-day global distribution of ozone at over 3300 vegetated sites and the long-term trends at nearly 1200 sites. TOAR-Vegetation focusses on three metrics over vegetation-relevant time-periods across major world climatic zones: M12, the mean ozone during 08:00–19:59; AOT40, the accumulation of hourly mean ozone values over 40 ppb during daylight hours, and W126 with stronger weighting to higher hourly mean values, accumulated during 08:00–19:59. Although the density of measurement stations is highly variable across regions, in general, the highest ozone values (mean, 2010–14) are in mid-latitudes of the northern hemisphere, including southern USA, the Mediterranean basin, northern India, north, north-west and east China, the Republic of Korea and Japan. The lowest metric values reported are in Australia, New Zealand, southern parts of South America and some northern parts of Europe, Canada and the USA. Regional-scale assessments showed, for example, significantly higher AOT40 and W126 values in East Asia (EAS) than Europe (EUR) in wheat growing areas (p &lt; 0.05), but not in rice growing areas. In NAM, the dominant trend during 1995–2014 was a significant decrease in ozone, whilst in EUR it was no change and in EAS it was a significant increase. TOAR-Vegetation provides recommendations to facilitate a more complete global assessment of ozone impacts on vegetation in the future, including: an increase in monitoring of ozone and collation of field evidence of the damaging effects on vegetation; an investigation of the effects on peri-urban agriculture and in mountain/upland areas; inclusion of additional pollutant, meteorological and inlet height data in the TOAR dataset; where not already in existence, establishing new region-specific thresholds for vegetation damage and an innovative integration of observations and modelling including stomatal uptake of the pollutant.

Introduction The aim of this paper is to examine whether recent catastrophic tsunamis have driven a cultural shift in the awareness of Australians to the danger associated with this natural hazard and whether the media have contributed to the emergence of “tsunami” as a new Australian catastrophe. Prior to the devastating 2004 Indian Ocean Tsunami disaster (2004 IOT), tsunamis as a type of hazard capable of generating widespread catastrophe were not well known by the general public and had barely registered within the wider scientific community. As a university based lecturer who specialises in natural disasters, I always started my public talks or student lectures with an attempt at a detailed description of what a tsunami is. With little high quality visual and media imagery to use, this was not easy. The Australian geologist Ted Bryant was right when he named his 2001 book Tsunami: The Underrated Hazard. That changed on 26 December 2004 when the third largest earthquake ever recorded occurred northwest of Sumatra, Indonesia, triggering the most catastrophic tsunami ever experienced. The 2004 IOT claimed at least 220,000 lives—probably more—injured tens of thousands, destroyed widespread coastal infrastructure and left millions homeless. Beyond the catastrophic impacts, this tsunami was conspicuous because, for the first time, such a devastating tsunami was widely captured on video and other forms of moving and still imagery. This occurred for two reasons. Firstly, the tsunami took place during daylight hours in good weather conditions—factors conducive to capturing high quality visual images. Secondly, many people—both local residents and westerners who were on beachside holidays and at the coast at multiple locations impacted by the tsunami—were able to capture images of the tsunami on their cameras, videos, and smart phones. The extensive media coverage—including horrifying television, video, and still imagery that raced around the globe in the hours and days after the tsunami, filling our television screens, homes, and lives regardless of where we lived—had a dramatic effect. This single event drove a quantum shift in the wider cultural awareness of this type of catastrophe and acted as a catalyst for improved individual and societal understanding of the nature and effects of disaster landscapes. Since this event, there have been several notable tsunamis, including the March 2011 Japan catastrophe. Once again, this event occurred during daylight hours and was widely captured by multiple forms of media. These events have resulted in a cascade of media coverage across television, radio, movie, and documentary channels, in the print media, online, and in the popular press and on social media—very little of which was available prior to 2004. Much of this has been documentary and informative in style, but there have also been numerous television dramas and movies. For example, an episode of the popular American television series CSI Miami entitled Crime Wave (Season 3, Episode 7) featured a tsunami, triggered by a volcanic eruption in the Atlantic and impacting Miami, as the backdrop to a standard crime-filled episode ("CSI," IMDb; Wikipedia). In 2010, Warner Bros Studios released the supernatural drama fantasy film Hereafter directed by Clint Eastwood. In the movie, a television journalist survives a near-death experience during the 2004 IOT in what might be the most dramatic, and probably accurate, cinematic portrayal of a tsunami ("Hereafter," IMDb; Wikipedia). Thus, these creative and entertaining forms of media, influenced by the catastrophic nature of tsunamis, are impetuses for creativity that also contribute to a transformation of cultural knowledge of catastrophe. The transformative potential of creative media, together with national and intergovernmental disaster risk reduction activity such as community education, awareness campaigns, community evacuation planning and drills, may be indirectly inferred from rapid and positive community behavioural responses. By this I mean many people in coastal communities who experience strong earthquakes are starting a process of self-evacuation, even if regional tsunami warning centres have not issued an alert or warning. For example, when people in coastal locations in Samoa felt a large earthquake on 29 September 2009, many self-evacuated to higher ground or sought information and instruction from relevant authorities because they expected a tsunami to occur. When interviewed, survivors stated that the memory of television and media coverage of the 2004 IOT acted as a catalyst for their affirmative behavioural response (Dominey-Howes and Thaman 1). Thus, individual and community cultural understandings of the nature and effects of tsunami catastrophes are incredibly important for shaping resilience and reducing vulnerability. However, this cultural shift is not playing out evenly.Are Australia and Its People at Risk from Tsunamis?Prior to the 2004 IOT, there was little discussion about, research in to, or awareness about tsunamis and Australia. Ted Bryant from the University of Wollongong had controversially proposed that Australia had been affected by tsunamis much bigger than the 2004 IOT six to eight times during the last 10,000 years and that it was only a matter of when, not if, such an event repeated itself (Bryant, "Second Edition"). Whilst his claims had received some media attention, his ideas did not achieve widespread scientific, cultural, or community acceptance. Not-with-standing this, Australia has been affected by more than 60 small tsunamis since European colonisation (Dominey-Howes 239). Indeed, the 2004 IOT and 2006 Java tsunami caused significant flooding of parts of the Northern Territory and Western Australia (Prendergast and Brown 69). However, the affected areas were sparsely populated and experienced very little in the way of damage or loss. Thus they did not cross any sort of critical threshold of “catastrophe” and failed to achieve meaningful community consciousness—they were not agents of cultural transformation.Regardless of the risk faced by Australia’s coastline, Australians travel to, and holiday in, places that experience tsunamis. In fact, 26 Australians were killed during the 2004 IOT (DFAT) and five were killed by the September 2009 South Pacific tsunami (Caldwell et al. 26). What Role Do the Media Play in Preparing for and Responding to Catastrophe?Regardless of the type of hazard/disaster/catastrophe, the key functions the media play include (but are not limited to): pre-event community education, awareness raising, and planning and preparations; during-event preparation and action, including status updates, evacuation warnings and notices, and recommendations for affirmative behaviours; and post-event responses and recovery actions to follow, including where to gain aid and support. Further, the media also play a role in providing a forum for debate and post-event analysis and reflection, as a mechanism to hold decision makers to account. From time to time, the media also provide a platform for examining who, if anyone, might be to blame for losses sustained during catastrophes and can act as a powerful conduit for driving socio-cultural, behavioural, and policy change. Many of these functions are elegantly described and a series of best practices outlined by The Caribbean Disaster Emergency Management Agency in a tsunami specific publication freely available online (CDEMA 1). What Has Been the Media Coverage in Australia about Tsunamis and Their Effects on Australians?A manifest contents analysis of media material covering tsunamis over the last decade using the framework of Cox et al. reveals that coverage falls into distinctive and repetitive forms or themes. After tsunamis, I have collected articles (more than 130 to date) published in key Australian national broadsheets (e.g., The Australian and Sydney Morning Herald) and tabloid (e.g., The Telegraph) newspapers and have watched on television and monitored on social media, such as YouTube and Facebook, the types of coverage given to tsunamis either affecting Australia, or Australians domestically and overseas. In all cases, I continued to monitor and collect these stories and accounts for a fixed period of four weeks after each event, commencing on the day of the tsunami. The themes raised in the coverage include: the nature of the event. For example, where, when, why did it occur, how big was it, and what were the effects; what emergency response and recovery actions are being undertaken by the emergency services and how these are being provided; exploration of how the event was made worse or better by poor/good planning and prior knowledge, action or inaction, confusion and misunderstanding; the attribution of blame and responsibility; the good news story—often the discovery and rescue of an “iconic victim/survivor”—usually a child days to weeks later; and follow-up reporting weeks to months later and on anniversaries. This coverage generally focuses on how things are improving and is often juxtaposed with the ongoing suffering of victims. I select the word “victims” purposefully for the media frequently prefer this over the more affirmative “survivor.”The media seldom carry reports of “behind the scenes” disaster preparatory work such as community education programs, the development and installation of warning and monitoring systems, and ongoing training and policy work by response agencies and governments since such stories tend to be less glamorous in terms of the disaster gore factor and less newsworthy (Cox et al. 469; Miles and Morse 365; Ploughman 308).With regard to Australians specifically, the manifest contents analysis reveals that coverage can be described as follows. First, it focuses on those Australians killed and injured. Such coverage provides elements of a biography of the victims, telling their stories, personalising these individuals so we build empathy for their suffering and the suffering of their families. The Australian victims are not unknown strangers—they are named and pictures of their smiling faces are printed or broadcast. Second, the media describe and catalogue the loss and ongoing suffering of the victims (survivors). Third, the media use phrases to describe Australians such as “innocent victims in the wrong place at the wrong time.” This narrative establishes the sense that these “innocents” have been somehow wronged and transgressed and that suffering should not be experienced by them. The fourth theme addresses the difficulties Australians have in accessing Consular support and in acquiring replacement passports in order to return home. It usually goes on to describe how they have difficulty in gaining access to accommodation, clothing, food, and water and any necessary medicines and the challenges associated with booking travel home and the complexities of communicating with family and friends. The last theme focuses on how Australians were often (usually?) not given relevant safety information by “responsible people” or “those in the know” in the place where they were at the time of the tsunami. This establishes a sense that Australians were left out and not considered by the relevant authorities. This narrative pays little attention to the wide scale impact upon and suffering of resident local populations who lack the capacity to escape the landscape of catastrophe.How Does Australian Media Coverage of (Tsunami) Catastrophe Compare with Elsewhere?A review of the available literature suggests media coverage of catastrophes involving domestic citizens is similar globally. For example, Olofsson (557) in an analysis of newspaper articles in Sweden about the 2004 IOT showed that the tsunami was framed as a Swedish disaster heavily focused on Sweden, Swedish victims, and Thailand, and that there was a division between “us” (Swedes) and “them” (others or non-Swedes). Olofsson (557) described two types of “us” and “them.” At the international level Sweden, i.e. “us,” was glorified and contrasted with “inferior” countries such as Thailand, “them.” Olofsson (557) concluded that mediated frames of catastrophe are influenced by stereotypes and nationalistic values.Such nationalistic approaches preface one type of suffering in catastrophe over others and delegitimises the experiences of some survivors. Thus, catastrophes are not evenly experienced. Importantly, Olofsson although not explicitly using the term, explains that the underlying reason for this construction of “them” and “us” is a form of imperialism and colonialism. Sharp refers to “historically rooted power hierarchies between countries and regions of the world” (304)—this is especially so of western news media reporting on catastrophes within and affecting “other” (non-western) countries. Sharp goes much further in relation to western representations and imaginations of the “war on terror” (arguably a global catastrophe) by explicitly noting the near universal western-centric dominance of this representation and the construction of the “west” as good and all “non-west” as not (299). Like it or not, the western media, including elements of the mainstream Australian media, adhere to this imperialistic representation. Studies of tsunami and other catastrophes drawing upon different types of media (still images, video, film, camera, and social media such as Facebook, Twitter, and the like) and from different national settings have explored the multiple functions of media. These functions include: providing information, questioning the authorities, and offering a chance for transformative learning. Further, they alleviate pain and suffering, providing new virtual communities of shared experience and hearing that facilitate resilience and recovery from catastrophe. Lastly, they contribute to a cultural transformation of catastrophe—both positive and negative (Hjorth and Kyoung-hwa "The Mourning"; "Good Grief"; McCargo and Hyon-Suk 236; Brown and Minty 9; Lau et al. 675; Morgan and de Goyet 33; Piotrowski and Armstrong 341; Sood et al. 27).Has Extensive Media Coverage Resulted in an Improved Awareness of the Catastrophic Potential of Tsunami for Australians?In playing devil’s advocate, my simple response is NO! This because I have been interviewing Australians about their perceptions and knowledge of tsunamis as a catastrophe, after events have occurred. These events have triggered alerts and warnings by the Australian Tsunami Warning System (ATWS) for selected coastal regions of Australia. Consequently, I have visited coastal suburbs and interviewed people about tsunamis generally and those events specifically. Formal interviews (surveys) and informal conversations have revolved around what people perceived about the hazard, the likely consequences, what they knew about the warning, where they got their information from, how they behaved and why, and so forth. I have undertaken this work after the 2007 Solomon Islands, 2009 New Zealand, 2009 South Pacific, the February 2010 Chile, and March 2011 Japan tsunamis. I have now spoken to more than 800 people. Detailed research results will be presented elsewhere, but of relevance here, I have discovered that, to begin with, Australians have a reasonable and shared cultural knowledge of the potential catastrophic effects that tsunamis can have. They use terms such as “devastating; death; damage; loss; frightening; economic impact; societal loss; horrific; overwhelming and catastrophic.” Secondly, when I ask Australians about their sources of information about tsunamis, they describe the television (80%); Internet (85%); radio (25%); newspaper (35%); and social media including YouTube (65%). This tells me that the media are critical to underpinning knowledge of catastrophe and are a powerful transformative medium for the acquisition of knowledge. Thirdly, when asked about where people get information about live warning messages and alerts, Australians stated the “television (95%); Internet (70%); family and friends (65%).” Fourthly and significantly, when individuals were asked what they thought being caught in a tsunami would be like, responses included “fun (50%); awesome (75%); like in a movie (40%).” Fifthly, when people were asked about what they would do (i.e., their “stated behaviour”) during a real tsunami arriving at the coast, responses included “go down to the beach to swim/surf the tsunami (40%); go to the sea to watch (85%); video the tsunami and sell to the news media people (40%).”An independent and powerful representation of the disjunct between Australians’ knowledge of the catastrophic potential of tsunamis and their “negative” behavioral response can be found in viewing live television news coverage broadcast from Sydney beaches on the morning of Sunday 28 February 2010. The Chilean tsunami had taken more than 14 hours to travel from Chile to the eastern seaboard of Australia and the ATWS had issued an accurate warning and had correctly forecast the arrival time of the tsunami (approximately 08.30 am). The television and radio media had dutifully broadcast the warning issued by the State Emergency Services. The message was simple: “Stay out of the water, evacuate the beaches and move to higher ground.” As the tsunami arrived, those news broadcasts showed volunteer State Emergency Service personnel and Surf Life Saving Australia lifeguards “begging” with literally hundreds (probably thousands up and down the eastern seaboard of Australia) of members of the public to stop swimming in the incoming tsunami and to evacuate the beaches. On that occasion, Australians were lucky and the tsunami was inconsequential. What do these responses mean? Clearly Australians recognise and can describe the consequences of a tsunami. However, they are not associating the catastrophic nature of tsunami with their own lives or experience. They are avoiding or disallowing the reality; they normalise and dramaticise the event. Thus in Australia, to date, a cultural transformation about the catastrophic nature of tsunami has not occurred for reasons that are not entirely clear but are the subject of ongoing study.The Emergence of Tsunami as a “New Australian Catastrophe”?As a natural disaster expert with nearly two decades experience, in my mind tsunami has emerged as a “new Australian catastrophe.” I believe this has occurred for a number of reasons. Firstly, the 2004 IOT was devastating and did impact northwestern Australia, raising the flag on this hitherto, unknown threat. Australia is now known to be vulnerable to the tsunami catastrophe. The media have played a critical role here. Secondly, in the 2004 IOT and other tsunamis since, Australians have died and their deaths have been widely reported in the Australian media. Thirdly, the emergence of various forms of social media has facilitated an explosion in information and material that can be consumed, digested, reimagined, and normalised by Australians hungry for the gore of catastrophe—it feeds our desire for catastrophic death and destruction. Fourthly, catastrophe has been creatively imagined and retold for a story-hungry viewing public. Whether through regular television shows easily consumed from a comfy chair at home, or whilst eating popcorn at a cinema, tsunami catastrophe is being fed to us in a way that reaffirms its naturalness. Juxtaposed against this idea though is that, despite all the graphic imagery of tsunami catastrophe, especially images of dead children in other countries, Australian media do not and culturally cannot, display images of dead Australian children. Such images are widely considered too gruesome but are well known to drive changes in cultural behaviour because of the iconic significance of the child within our society. As such, a cultural shift has not yet occurred and so the potential of catastrophe remains waiting to strike. Fifthly and significantly, given the fact that large numbers of Australians have not died during recent tsunamis means that again, the catastrophic potential of tsunamis is not yet realised and has not resulted in cultural changes to more affirmative behaviour. Lastly, Australians are probably more aware of “regular or common” catastrophes such as floods and bush fires that are normal to the Australian climate system and which are endlessly experienced individually and culturally and covered by the media in all forms. The Australian summer of 2012–13 has again been dominated by floods and fires. If this idea is accepted, the media construct a uniquely Australian imaginary of catastrophe and cultural discourse of disaster. The familiarity with these common climate catastrophes makes us “culturally blind” to the catastrophe that is tsunami.The consequences of a major tsunami affecting Australia some point in the future are likely to be of a scale not yet comprehensible. References Australian Broadcasting Corporation (ABC). "ABC Net Splash." 20 Mar. 2013 ‹http://splash.abc.net.au/media?id=31077›. Brown, Philip, and Jessica Minty. “Media Coverage and Charitable Giving after the 2004 Tsunami.” Southern Economic Journal 75 (2008): 9–25. Bryant, Edward. Tsunami: The Underrated Hazard. First Edition, Cambridge: Cambridge UP, 2001. ———. Tsunami: The Underrated Hazard. Second Edition, Sydney: Springer-Praxis, 2008. Caldwell, Anna, Natalie Gregg, Fiona Hudson, Patrick Lion, Janelle Miles, Bart Sinclair, and John Wright. “Samoa Tsunami Claims Five Aussies as Death Toll Rises.” The Courier Mail 1 Oct. 2009. 20 Mar. 2013 ‹http://www.couriermail.com.au/news/samoa-tsunami-claims-five-aussies-as-death-toll-rises/story-e6freon6-1225781357413›. CDEMA. "The Caribbean Disaster Emergency Management Agency. Tsunami SMART Media Web Site." 18 Dec. 2012. 20 Mar. 2013 ‹http://weready.org/tsunami/index.php?Itemid=40&id=40&option=com_content&view=article›. Cox, Robin, Bonita Long, and Megan Jones. “Sequestering of Suffering – Critical Discourse Analysis of Natural Disaster Media Coverage.” Journal of Health Psychology 13 (2008): 469–80. “CSI: Miami (Season 3, Episode 7).” International Movie Database (IMDb). ‹http://www.imdb.com/title/tt0534784/›. 9 Jan. 2013. "CSI: Miami (Season 3)." Wikipedia. ‹http://en.wikipedia.org/wiki/CSI:_Miami_(season_3)#Episodes›. 21 Mar. 2013. DFAT. "Department of Foreign Affairs and Trade Annual Report 2004–2005." 8 Jan. 2013 ‹http://www.dfat.gov.au/dept/annual_reports/04_05/downloads/2_Outcome2.pdf›. Dominey-Howes, Dale. “Geological and Historical Records of Australian Tsunami.” Marine Geology 239 (2007): 99–123. Dominey-Howes, Dale, and Randy Thaman. “UNESCO-IOC International Tsunami Survey Team Samoa Interim Report of Field Survey 14–21 October 2009.” No. 2. Australian Tsunami Research Centre. University of New South Wales, Sydney. "Hereafter." International Movie Database (IMDb). ‹http://www.imdb.com/title/tt1212419/›. 9 Jan. 2013."Hereafter." Wikipedia. ‹http://en.wikipedia.org/wiki/Hereafter (film)›. 21 Mar. 2013. Hjorth, Larissa, and Yonnie Kyoung-hwa. “The Mourning After: A Case Study of Social Media in the 3.11 Earthquake Disaster in Japan.” Television and News Media 12 (2011): 552–59. ———, and Yonnie Kyoung-hwa. “Good Grief: The Role of Mobile Social Media in the 3.11 Earthquake Disaster in Japan.” Digital Creativity 22 (2011): 187–99. Lau, Joseph, Mason Lau, and Jean Kim. “Impacts of Media Coverage on the Community Stress Level in Hong Kong after the Tsunami on 26 December 2004.” Journal of Epidemiology and Community Health 60 (2006): 675–82. McCargo, Duncan, and Lee Hyon-Suk. “Japan’s Political Tsunami: What’s Media Got to Do with It?” International Journal of Press-Politics 15 (2010): 236–45. Miles, Brian, and Stephanie Morse. “The Role of News Media in Natural Disaster Risk and Recovery.” Ecological Economics 63 (2007): 365–73. Morgan, Olive, and Charles de Goyet. “Dispelling Disaster Myths about Dead Bodies and Disease: The Role of Scientific Evidence and the Media.” Revista Panamericana de Salud Publica-Pan American Journal of Public Health 18 (2005): 33–6. Olofsson, Anna. “The Indian Ocean Tsunami in Swedish Newspapers: Nationalism after Catastrophe.” Disaster Prevention and Management 20 (2011): 557–69. Piotrowski, Chris, and Terry Armstrong. “Mass Media Preferences in Disaster: A Study of Hurricane Danny.” Social Behavior and Personality 26 (1998): 341–45. Ploughman, Penelope. “The American Print News Media Construction of Five Natural Disasters.” Disasters 19 (1995): 308–26. Prendergast, Amy, and Nick Brown. “Far Field Impact and Coastal Sedimentation Associated with the 2006 Java Tsunami in West Australia: Post-Tsunami Survey at Steep Point, West Australia.” Natural Hazards 60 (2012): 69–79. Sharp, Joanne. “A Subaltern Critical Geopolitics of The War on Terror: Postcolonial Security in Tanzania.” Geoforum 42 (2011): 297–305. Sood, Rahul, Stockdale, Geoffrey, and Everett Rogers. “How the News Media Operate in Natural Disasters.” Journal of Communication 37 (1987): 27–41.