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Littérature scientifique sur le sujet « Magnetotelluric studies »

Auteur : Grafiati

Publié le 6 septembre 2023

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Articles de revues sur le sujet "Magnetotelluric studies"

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Gokarn, S. G., C. K. Rao, B. P. Singh et P. N. Nayak. « Magnetotelluric studies across the Kurduwadi gravity feature ». Physics of the Earth and Planetary Interiors 72, n^o 1-2 (juillet 1992) : 58–67. http://dx.doi.org/10.1016/0031-9201(92)90049-2.

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Unsworth, Martyn. « Magnetotelluric Studies of Active Continent–Continent Collisions ». Surveys in Geophysics 31, n^o 2 (24 novembre 2009) : 137–61. http://dx.doi.org/10.1007/s10712-009-9086-y.

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Chen, Kai, Sheng Jin et Ming Deng. « Multifunction waveform generator for EM receiver testing ». Geoscientific Instrumentation, Methods and Data Systems 7, n^o 1 (29 janvier 2018) : 11–19. http://dx.doi.org/10.5194/gi-7-11-2018.

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Abstract. In many electromagnetic (EM) methods – such as magnetotelluric, spectral-induced polarization (SIP), time-domain-induced polarization (TDIP), and controlled-source audio magnetotelluric (CSAMT) methods – it is important to evaluate and test the EM receivers during their development stage. To assess the performance of the developed EM receivers, controlled synthetic data that simulate the observed signals in different modes are required. In CSAMT and SIP mode testing, the waveform generator should use the GPS time as the reference for repeating schedule. Based on our testing, the frequency range, frequency precision, and time synchronization of the currently available function waveform generators on the market are deficient. This paper presents a multifunction waveform generator with three waveforms: (1) a wideband, low-noise electromagnetic field signal to be used for magnetotelluric, audio-magnetotelluric, and long-period magnetotelluric studies; (2) a repeating frequency sweep square waveform for CSAMT and SIP studies; and (3) a positive-zero–negative-zero signal that contains primary and secondary fields for TDIP studies. In this paper, we provide the principles of the above three waveforms along with a hardware design for the generator. Furthermore, testing of the EM receiver was conducted with the waveform generator, and the results of the experiment were compared with those calculated from the simulation and theory in the frequency band of interest.

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Young, Charles T., John R. Booker, Ricardo Fernandez, George R. Jiracek, Mario Martinez, James C. Rogers, John Stodt, Harve S. Waff et Phillip E. Wannamaker. « Verification of five magnetotelluric systems in the mini‐EMSLAB experiment ». GEOPHYSICS 53, n^o 4 (avril 1988) : 553–57. http://dx.doi.org/10.1190/1.1442487.

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Given the degree of complexity of modern magnetotelluric (MT) instrumentation, comparison of the total performance for two or more systems is an important verification test. This paper compares the processed data from five MT systems which were designed and constructed separately, and which employ different electrode types, electrode separations, magnetometers, and methods of signal processing. The comparison shows that there is a high degree of agreement among the data from the different systems. The study also demonstrates the compatibility and reliability of the MT systems employed as part of EMSLAB Juan de Fuca (Electromagnetic Sounding of the Lithosphere and Asthenosphere Beneath the Juan de Fuca Plate). This project, proposed by a consortium of institutions, involves not only magnetotellurics studies but also studies of magnetic variation, on land and on the sea bottom. The project calls for the real‐time MT systems to occupy stations along segments of a profile in Oregon. A composite profile will be created from the segments. Prior to commencing the main MT profiling phase, one week was set aside in August, 1984, for all groups to record and process MT data sequentially at six sites in diverse geologic terrains; this experiment was called mini‐EMSLAB.

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Lantu, Syamsuddin et A. Hardianti Yunus. « KARAKTERISASI ZONA RESERVOAR CEKUNGAN BULA MALUKU DENGAN METODE ELEKTROMAGNETIK MAGNETOTELLURIK ». JURNAL GEOCELEBES 1, n^o 1 (17 mai 2017) : 23. http://dx.doi.org/10.20956/geocelebes.v1i1.1777.

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AbstrakTelah dilakukan penelitian dengan metode elaktromagnetik tellurik untuk karakterisasi zona reservoir hidrokarbon di daerah Bula Kabupaten Seram bagian timur, propinsi Maluku. Ditinjau dari tektonik lempeng , daerah ini merupakan cekungan sedimen yang kaya akan hidrokarbon. Metode yang digunakan untuk identifikasi potensi cekungan sedimen tersebut digunakan metode elektromagnetik magnetotellurik untukkarakterisasi sifat listrik sedimen yang terdapat pada cekungan teresbut. Tujuan utama penelitian adalah identifikasi zona reservoar potensial didaerah ini. Analisis dan interpretasi pengolahan data berupa model 1D yang menampilkan jumlah lapisan tiap titik pengukuran dan model 2D yang menampilkan struktur resistivitas bawah permukaan. Dari hasil analisa dan interpretasi model diperoleh bahwa zona reservoar berada pada kedalaman 2500 – 4000 meter pada rentan nilai resistivitas 32-1024 Ohmmeter didukung dengan adanya manifestasi minyak bumi di permukaan, informasi geologi daerah penelitian dan informasi dari penelitian sebelumnya.Kata Kunci : Cekungan Sedimen, Hidrokarbon, Magnetotellurik, ReservoarAbstractThe research have been realize with using the electromagnetic telluric for reservoir characterization of hydrocarbon. The Research area is located in Bula Seram which is the eastern part of Maluku Province. Base on map of the tectonic plate Seram island, area is sedimentary basins that is potential of hydrocarbons. The method used to predict the potential of sedimentary basins that magnetotelluric method to identificate of reservoir zone. This study uses secondary data of MT with two line, each line consisting of seven measurement points. The processed data shows 1D model that display the number of layers for each measurement points and 2D model that display the structure of subsurface resistivity. Analysis and interpretation model showed that the reservoir zone is located in a depth of 2500 - 4000 meter with resistivity values is about 32-1024 Ohmmeter supported by manifestation of oil on the surface, the geological information area of research and information from previous studies. Key word : Sedimentary Basin, Hidrocarbon, Magnetotelluric, Reservoir

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Chen, C. S., F. Hsieh, D. Zuo, J. Li, Lin Lin et G. Xie. « Magnetotelluric Modelling and Inversion For Earthquake Studies in Taiwan ». ASEG Extended Abstracts 2003, n^o 1 (avril 2003) : 1–5. http://dx.doi.org/10.1071/aseg2003_3demab003.

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Gokarn, S. G., Gautam Gupta, Shipra Dutta et Nitu Hazarika. « Geoelectric structure in the Andaman Islands using magnetotelluric studies ». Earth, Planets and Space 58, n^o 2 (février 2006) : 259–64. http://dx.doi.org/10.1186/bf03353386.

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Gokarn, S. G., C. K. Rao et Gautam Gupta. « Crustal structure in the Siwalik Himalayas using magnetotelluric studies ». Earth, Planets and Space 54, n^o 1 (janvier 2002) : 19–30. http://dx.doi.org/10.1186/bf03352418.

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Gokarn, S. G., C. K. Rao, Gautam Gupta, B. P. Singh et M. Yamashita. « Deep crustal structure in central India using magnetotelluric studies ». Geophysical Journal International 144, n^o 3 (mars 2001) : 685–94. http://dx.doi.org/10.1046/j.1365-246x.2001.01355.x.

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de Lugão, Patricia Pastana, Emanuele Francesco LaTerra, Berthold Kriegshäuser et Sergio L. Fontes. « Magnetotelluric studies of the Caldas Novas geothermal reservoir, Brazil ». Journal of Applied Geophysics 49, n^o 1-2 (janvier 2002) : 33–46. http://dx.doi.org/10.1016/s0926-9851(01)00097-0.

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Thèses sur le sujet "Magnetotelluric studies"

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Galanopoulos, Dimitrios. « Magnetotelluric studies in geothermal areas of Greece and Kenya ». Thesis, University of Edinburgh, 1989. http://hdl.handle.net/1842/10909.

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Krause, P. J. « Geomagnetic and magnetotelluric studies in the South-West of England ». Thesis, University of Exeter, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353997.

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Bailey, David. « Magnetotelluric studies of the Zambezi Valley mobile belt, Northern Zimbabwe ». Thesis, University of Edinburgh, 1998. http://hdl.handle.net/1842/10697.

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The Mana Pools and Lower Zambezi Karoo sedimentary basins lie within the Zambezi mobile belt in northern Zimbabwe. The subsurface apparent resistivities measured at both locations are extremely low. This thesis models the resistivity structure of these two basins and the underlying material. New and pre-existing magnetotelluric data and the available seismic reflection data are used to determine the basin structure and the depth of the electrical basement. Long period magnetotelluric data were collected at 5 stations along a 60 km profile running north-south across the Mana Pools basin and onto the escarpment to the south. These data are used to augment an existing audio frequency dataset from the same area. After processing of both datasets the estimated impedance tensor is decomposed, showing that the resistivity structure of the Mana Pools basin can be modelled two dimensionally. Minimum structure models for the Mana Pools and Lower Zambezi basins are produced and compared, the latter obtained from a pre-exiting magnetotelluric dataset. There are significant differences between the structure of the two basins. The major conductive feature in the Mana Pools basin is contained within the Upper Karoo sedimentary layer and does not extend into the basement below, which is, however, of an extremely low resistivity for basement rock. The electrical basement in the Lower Zambezi basin is not detected. A good conductor is again found in the Upper Karoo sediments but extends to below 11.6 km, within the gneissic rocks of the seismic basement. The resistivity structure of the Mana Pools basin is well modelled as a series of resistive layers whose boundaries are defined by the seismic data.

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Mohamed, Adel K. « Applications of magnetotelluric and transient electromagnetic methods in groundwater and engineering studies ». Thesis, University of Leicester, 2002. http://hdl.handle.net/2381/30449.

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The main aim of this study is to use the transient electromagnetic (TEM) and magnetotelluric (MT) methods to determine the electrical resistivity distribution of the subsurface and locate possible structural features controlling groundwater distribution in the northern and south-eastern margins of Parnaiba basin, Brazil. MT data from 24 stations along two profiles across the margins of the basin have been processed using standard tensorial techniques to obtain the interpretable response functions. The TEM data recorded at the same sites facilitated the removal of static shift and the recovery of the near-surface structure. One-dimensional (1-D) joint inversion of TEM and MT data yielded an approximate geoelectric structure for each profile. Subsequent two-dimensional (2-D) modelling revealed a more realistic resistivity distribution for each profile. The result of 2-D regularized inversion of MT data delineated the main sedimentary sequences and deep basement features. A resistive crystalline basement (â‰¥ 200 &OHgr;m) is overlain by relatively conductive sedimentary sequences of varying resistivities and thicknesses. The existence of a major basement trough at the expected position of a concealed fault in the north-eastern margin of the basin was proved by the MT model. This anomalous zone is interpreted to have a thick development of granular sediments and may be a good site for groundwater development. The 2-D model for the south-eastern profile defined the position of a major fault, which is interpreted as Picos fault and may have implication for groundwater development. A graben-like structure is also suggested âˆ¼10 km further east from Picos fault and considered to be a good target for groundwater development. Overall, the 2-D MT inversion results are consistent with the available geological information and offer new insights into the deep structure of the basin margins of Parnaiba basin.

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Johnson, Nicholas Edward. « Magnetotelluric studies of the crust and upper mantle in a zone of active continental breakup, Afar, Ethiopia ». Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7739.

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The Afar region of Ethiopia is slowly being torn apart by the Red Sea, Gulf of Aden and Main Ethiopian rifts which all meet at this remote, barren corner of Africa. Prior to rifting, volcanism probably started here some 30 million years ago, marked by the arrival of the Afar mantle plume and subsequent eruption of kilometres thick flood basalts. To the north and east the Red Sea and Gulf of Aden rifts have already progressed to become sea-floor spreading centres where new oceanic crust is produced. Active spreading on the Red Sea rift takes a landward step west into Eritrean Afar at approximately 15oN, after which divergence between the Nubian and Arabian tectonic plates is localised into 60 km long, 20 km wide magmatic segments that undergo periodic rifting cycles. This part of Afar is a unique natural laboratory where the process of transition from continental rifting to sea floor spreading can be studied. In September 2005 a dramatic rifting episode began on one such segment of the Red Sea rift in Afar (the Dabbahu magmatic segment), whereby a 60 km long dyke containing an estimated 2.5 km3 magma was intruded in just two weeks, allowing opening of up to 8 m. Since then a further 13 smaller dykes have been intruded, some with fissural eruptions of basaltic lava. Subsidence observed via geodetic observations can only account for a small fraction of the magma supply required to in ate the dykes, suggesting a deep crustal or upper mantle source must exist. The magnetotelluric (MT) method is a passive geophysical technique, used to probe the Earth to reveal subsurface conductivity. The presence of fluids can dramatically increase conductivity by orders of magnitude making the MT method ideally suited to detecting them. MT data collected from 22 sites on profiles near to and crossing the active rift are analysed and interpreted in conjunction with seismic and petrological constraints. They reveal for the first time, the existence of both a mid to lower-crustal magma chamber directly below the rift, and an o -axis zone of partial melt well within the mantle. The volume of melt contained within the crust and upper mantle below the Dabbahu segment is estimated to be at least 350 km3; enough to supply the rift at current spreading rates for almost 30 thousand years, assuming that both melt containing regions supply the rift. Vast amounts of highly conductive material, suggesting the existence of pure melt in places, are also required in the shallow crust close to Dabbahu volcano which lies at the northern end of the segment. Further data collected on the currently inactive Hararo segment which is the next one to the south of Dabbahu, show a smaller zone of partial melt that appears to be pooling at the Moho, inferred seismically to be at about 22 km, but little or no melt is required within the mid-crust. The minimum amount of melt estimated to be contained here is just 21 km3; an order of magnitude less than on the Dabbahu segment, but similar to estimates for melt within the crust found below the rift axis in the continental Main Ethiopian rift. This, along with other morphological evidence, suggests that this rift segment is less mature than the Dabbahu segment to the north, rather than it simply being at a different stage of a rifting cycle. A wide spread layer of highly conductive sediments up to 2 km thick has been imaged at most locations. This was unexpected on the Dabbahu segment where the surface of the Earth is dominated by heavily faulted basalts erupted from fissures, which are seen as a resistive uppermost layer several hundred metres thick. The high conductivity of the sediments is attributed to high heat flow and the presence of brines.

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Hübert, Juliane. « From 2D to 3D Models of Electrical Conductivity based upon Magnetotelluric Data : Experiences from two Case Studies ». Doctoral thesis, Uppsala universitet, Geofysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-165143.

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Magnetotelluric measurements are among the few geophysical techniques capable of imaging the structure both in the shallow subsurface as well as the entire crust of the Earth. With recent technical and computational advances it has become possible to derive three-dimensional inversion models of the electrical conductivity from magnetotelluric data, thereby overcoming the problems arising from the simplified assumption of two-dimensionality in conventional two-dimensional modeling. The transition from two-dimensional to three-dimensional analysis requires careful reconsideration of the classical challenges of magnetotellurics: galvanic distortion, data errors, model discretization and resolution.This work presents two examples of magnetotelluric investigations, where a new three-dimensional inversion algorithm has been applied. The new models are compared with conventional two-dimensional models and combined with the results of other geophysical techniques like reflection seismics and electrical resistivity tomography. The first case presents magnetotelluric investigations of the Kristineberg mining area in the Skellefte district, northern Sweden. This study is part of a joint geophysical and geological project to investigate the present structure and evolution of the whole district. Together with reflection seismic and surface geological information a three-dimensional conductivity model, derived through the inversion of magnetotelluric data, was interpreted. A comparison with two-dimensional modeling gives insights into the capabilities and challenges of three-dimensional inversion strategies with respect to data sampling and model resolution.The second case presents a study of remediation monitoring with geophysical methods after an oil blow-out in Trecate, Italy. A three-dimensional conductivity model was derived from radiomagnetotelluric measurements. In addition, two-dimensional joint inversion of radiomagnetotelluric and electrical tomography data was performed. Compared with electrical resistivity tomography, radiomagnetotelluric data is more sensitive to conductors and the derived three-dimensional inversion model resolves the vadose zone and the underlying aquifer.

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Danladi, Reuben. « Integrated magnetotelluric (MT) and transient electromagnetic (TEM) studies of structural control on massive sulphide mineralisation in part of northeastern Troodos Ophiolite Complex, Cyprus ». Thesis, University of Leicester, 1997. http://hdl.handle.net/2381/30461.

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The massive Fe- and Cu-sulphide mineralisation is the most valuable economic resource in the Troodos and has been explored and exploited mainly through exploratory drilling around ancient slags, gossans and old workings. The exhaustion of these superficial guides has meant a shift to locating orebodies at depth. Direct detection of orebodies by traditional geophysical methods has been difficult. Structures parallel and perpendicular to the spreading axes in the region are thought to control the localisation of the sulphide deposits. Their identification should aid indirect detection of mineralisations. Prior to speculation on possible geological meanings of data from an area not known for sulphide mineralisation, 33 MT and 48 TEM soundings were performed at Klirou, a known area of buried massive sulphide mineralisation. The joint MT/TEM methods identified the low resistivity lithological unit that hosts the mineralisation and the bounding faults, demonstrating their usefulness in mapping the lithological units and structures that host and control these mineralisations. Coincident IP and geological or geochemical anomalies could then be used to locate the orebodies. In Ayia Marina area, 37 MT and 68 TEM soundings were undertaken. Some ENE structures corresponding to the western flank of Mitsero graben, where the extrusion of the Troodos sulphide-bearing lavas is envisaged to have taken place, have been confirmed by ground MT/TEM surveys. The occurrence of olivine-bearing rocks north of Ayia Marina and the existence of an andesite plus 2 km north-northwest of Ayia Marina suggest that the interpreted low resistivity zone in the area may correspond to a prospective zone for massive sulphide occurrence.

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Khoza, Tshepo David. « Magnetotelluric studies across the Damara Orogen and Southern Congo craton ». Thesis, 2016. http://hdl.handle.net/10539/20354.

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A thesis submitted to the Faculty of Science, University of the Witwatersrand, in fulfilment of the requirements for the degree of Doctor of Philosophy University of the Witwatersrand School of Geosciences and Dublin Institute for Advanced Studies School of Cosmic Physics Geophysics Section February 2016
Archean cratons, and the Proterozoic orogenic belts on their flanks, form an integral part of the Southern Africa tectonic landscape. Of these, virtually nothing is known of the position and thickness of the southern boundary of the composite Congo craton and the Neoproterozoic Pan African orogenic belt due to thick sedimentary cover. In this work I present the first lithospheric-scale geophysical study of that cryptic boundary and define its geometry at depth. The results are derived from two-dimensional (2D) and three-dimensional (3D) inversion of magnetotelluric data acquired along four semi-parallel profiles crossing the Kalahari craton across the Damara-Ghanzi-Chobe belts (DGC) and extending into the Congo craton. Two dimensional and three-dimensional electrical resistivity models show significant lateral variation in the crust and upper mantle across strike from the younger DGC orogen to the older adjacent cratons. The Damara belt lithosphere is found to be more conductive and significantly thinner than that of the adjacent Congo craton. The Congo craton is characterized by very thick (to depths of 250 km) and resistive (i.e. cold) lithosphere. Resistive upper crustal features are interpreted as caused by igneous intrusions emplaced during Pan-African magmatism. Graphite-bearing calcite marbles and sulfides are widespread in the Damara belt and account for the high crustal conductivity in the Central Zone. The resistivity models provide new constraints on the southern extent of the greater Congo craton, and suggest that the current boundary drawn on geological maps needs revision and that the craton should be extended further south. The storage possibilities for the Karoo Basins were found to be poor because of the very low porosity and permeability of the sandstones, the presence of extensive dolerite sills and dykes. The obvious limitation of the above study is the large spacings between the MT stations (> 10km). This is particularly more limiting in resolving the horizontal layers in the Karoo basin. However the 1D models provide layered Earth models that are consistent with the known geology. The resistivity values from the 1D models allowed porosity of the Ecca and Beaufort group lithologies to be calculated. It is inferred that the porosities values are in the range 5-15 % in the region below the profile. This value is considered too low for CO2 storage as the average porosity of rock used for CO2 is generally more than 10 to 12 percent of the total rock unit volume.

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Ribeiro, Joana Alves. « Magnetotelluric studies in detecting and old suture zone and major crustal scale shear zones (iberia) ». Doctoral thesis, 2018. http://hdl.handle.net/10451/35917.

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Tese de doutoramento, Ciências Geofísicas e da Geoinformação (Geofísica), Universidade de Lisboa, Faculdade de Ciências, 2018
Lisbon Doctoral School on Earth System Science, Instituto Dom Luíz (IDL), Programa de Doutoramento, PD/143/2012, PD/BD/52557/2012; Fundo Europeu de Desenvolvimento Regional (FEDER), COMPETE : FCOMP-01-0124-FEDER-029192

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Murray, P. E. « A comparison of porosity values inferred from magnetotelluric and bore-hole density data ; case studies from two geothermal regions in South Australia ». Thesis, 2012. http://hdl.handle.net/2440/95178.

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This item is only available electronically.
Porosity is one of the main determining factors of the prospectivity of geothermal regions and can be estimated in a number of ways from geophysical surveys. The objective of this work was to better understand the link between porosity, permeability and electrical resistivity through Archie's law. This was achieved by comparing porosity values derived from magnetotelluric (MT) data with those derived from density measurements taken in a petroleum borehole. Two case studies were used and are located in north-eastern South Australia. The outcomes of these studies will help to minimise exploration risk by proving the effectiveness of MT as a primary survey of geothermal regions. This study provides a stepping stone to understand the ways in which permeability can be determined from MT surveys in order to better quantify expected fluid flow rates in geothermal prospects.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Earth and Environmental Sciences, 2012

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Livres sur le sujet "Magnetotelluric studies"

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Ádám, Antal. Role of magnetotellurics in geophysical prospecting. Hyderabad, India : Association of Exploration Geophysicists, 1985.

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A, Ádám. Role of magnetotellurics in geophysical prospecting. Hyderabad, India : Association of Exploration Geophysicists, 1985.

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Chapitres de livres sur le sujet "Magnetotelluric studies"

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Madden, T. R., et C. M. Swift. « Magnetotelluric Studies of the Electrical Conductivity Structure of the Crust and Upper Mantle ». Dans The Earth's Crust and Upper Mantle, 469–79. Washington, D. C. : American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm013p0469.

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Berdichevsky, Mark N., Valery Bubnov, Elena Aleksanova, Dmitry Alekseev, Andrey Yakovlev et Denis Yakovlev. « Magnetotelluric Studies in Russia : Regional-Scale Surveys and Hydrocarbon Exploration ». Dans Electromagnetic Sounding of the Earth's Interior, 379–401. Elsevier, 2015. http://dx.doi.org/10.1016/b978-0-444-63554-9.00013-1.

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Varentsov, Ivan M. « Methods of Joint Robust Inversion in Magnetotelluric and Magnetovariational Studies with Application to Synthetic Datasets ». Dans Electromagnetic Sounding of the Earth's Interior, 191–229. Elsevier, 2015. http://dx.doi.org/10.1016/b978-0-444-63554-9.00008-8.

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Dai, Lidong, Haiying Hu, Yu He et Wenqing Sun. « Some New Progress in the Experimental Measurements on Electrical Property of Main Minerals in the Upper Mantle at High Temperatures and High Pressures ». Dans Mineralogy [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.101876.

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In this chapter, we present the recent progress in the experimental studies of the electrical conductivity of dominant nominally anhydrous minerals in the upper mantle of the deep Earth interior, namely, olivine, pyroxene, and garnet. The influences from pressure, oxygen partial pressure, and anisotropic orientation on hydrous and anhydrous electrical conductivities of minerals and rocks have been already explored detailedly. There are two main electric conduction mechanisms in Fe-bearing mantle minerals, for example, small proton and proton hopping conditions, which are well distinguished by the magnitude of activation enthalpy at high temperature and high pressure. Likewise, the conduction mechanisms are efficiently characterized by these obtained positive and negative effects from the oxygen fugacity on electrical conductivities of corresponding dry and wet Fe-bearing silicate minerals at the regions of the upper mantle under conditions of different oxygen partial pressures. On the base of high-pressure laboratory-based conductivity measurements for these nominally anhydrous minerals (e.g., olivine, pyroxene, and garnet), the water content will be estimated within the depth range of the upper mantle. In comprehensive considerations of filed geophysical magnetotelluric results, the electrical conductivity measurements of dominant upper-mantle minerals can thoroughly disclose the distribution, storage state, and migration conduction in the deep Earth interior.

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Actes de conférences sur le sujet "Magnetotelluric studies"

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Francesco La Terra, Emanuele, Patricia Pastana de Lugăo et Sergio L. Fontes. « Magnetotelluric Studies of the Caldas Novas Geothermal Area, Brazil ». Dans 5th International Congress of the Brazilian Geophysical Society. European Association of Geoscientists & Engineers, 1997. http://dx.doi.org/10.3997/2214-4609-pdb.299.248.

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A. Monteiro Santos, Fernando, Eugénio P. Almeida, António Soares, Rita Nolasco et Luís Mendes Victor. « The Use Of Telluric And Magnetotelluric Methods In Graben Studies ». Dans 7th International Congress of the Brazilian Geophysical Society. European Association of Geoscientists & Engineers, 2001. http://dx.doi.org/10.3997/2214-4609-pdb.217.040.

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da Silva Rocha, Nina, Leonardo Guimarães Miquelutti et Sergio Luiz Fontes. « Magnetotelluric Studies in NE of Brazil : Parnaíba basin and Adjacencies ». Dans 15th International Congress of the Brazilian Geophysical Society & EXPOGEF, Rio de Janeiro, Brazil, 31 July-3 August 2017. Brazilian Geophysical Society, 2017. http://dx.doi.org/10.1190/sbgf2017-041.

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Zhang, Letian, Wenbo Wei, Sheng Jin, Gaofeng Ye, Hao Dong, Fan Zhang, Chengliang Xie et Hui Wang. « Structure of the Eastern Margin of the Tibetan Plateau from Magnetotelluric Studies ». Dans Near Surface Geophysics Asia Pacific Conference, Beijing, China 17-19 July 2013. Society of Exploration Geophysicists, Australian Society of Exploration Geophysicists, Chinese Geophysical Society, Korean Society of Earth and Exploration Geophysicists, and Society of Exploration Geophysicists of Japan, 2013. http://dx.doi.org/10.1190/nsgapc2013-093.

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Srebrov, B., I. Logvinov et E. Botev. « Magnetotelluric Studies and Regional Seismic Activity in the Central Part of Balkans ». Dans 11th Congress of the Balkan Geophysical Society. European Association of Geoscientists & Engineers, 2021. http://dx.doi.org/10.3997/2214-4609.202149bgs26.

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Hautot, S., P. Tarits et P. Roach. « Magnetotelluric and Gravity Subbasalt Imaging : Case Studies from Ethiopia and Djibouti Republic ». Dans EAGE/SPE Subsalt Imaging Workshop. Netherlands : EAGE Publications BV, 2016. http://dx.doi.org/10.3997/2214-4609.201600442.

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Montahaei, M. « A Comparison of WAL Rotational Invariants and GB Decomposition Method for Magnetotelluric Data Analysis, Synthetic Studies ». Dans 4th Asia Pacific Meeting on Near Surface Geoscience & Engineering. European Association of Geoscientists & Engineers, 2021. http://dx.doi.org/10.3997/2214-4609.202177040.

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Chandrasekhar, E., Mita Rajaram, S. P. Anand, Sergio L. Fontes et Jean Marie Flexor. « Aeromagnetic and Magnetotelluric Studies in Guaribas Region of Parnaiba Basin in North East Brazil for Groundwater Assessment ». Dans 9th International Congress of the Brazilian Geophysical Society & EXPOGEF, Salvador, Bahia, Brazil, 11-14 September 2005. Society of Exploration Geophysicists and Brazilian Geophysical Society, 2005. http://dx.doi.org/10.1190/sbgf2005-172.

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Chandrasekhar, E., Mita Rajaram, S. P. Anand, Sergio L. Fontes et Jean Marie Flexor. « Aeromagnetic and Magnetotelluric Studies in Guaribas Region of Parnaiba Basin in North East Brazil for Groundwater Assessment ». Dans 9th International Congress of the Brazilian Geophysical Society. European Association of Geoscientists & Engineers, 2005. http://dx.doi.org/10.3997/2214-4609-pdb.160.sbgf168.

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Rapports d'organisations sur le sujet "Magnetotelluric studies"

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Craven, J. A., G. McNeice, B. Powell, R. Koch, I R Annesley, G. Wood, C J Mwenifumbo, M. J. Unsworth et W. Xiao. Audio-magnetotelluric studies at the McArthur River mining camp and Shea Creek area, northern Saskatchewan. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2007. http://dx.doi.org/10.4095/223785.

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McLeod, J., J. A. Craven, I. J. Ferguson et B. J. Roberts. Overview of the 2013 and 2014 baseline magnetotelluric & ; controlled source electromagnetic studies of CO2 sequestration at the aquistore site near Estevan, Saskatchewan. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2016. http://dx.doi.org/10.4095/299100.

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Peter, J. M., et M. G. Gadd. Introduction to the volcanic- and sediment-hosted base-metal ore systems synthesis volume, with a summary of findings. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/328015.

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Résumé :

This volume presents results of research conducted during phase 5 of the Volcanic- and Sedimentary-hosted Base Metals Ore Systems project of the Geological Survey of Canada's Targeted Geoscience Initiative (TGI) program. The papers in this volume include syntheses and primary scientific reports. We present here a synopsis of the findings during this TGI project. Research activities have addressed several mineral deposit types hosted in sedimentary rocks: polymetallic hyper-enriched black shale, sedimentary exhalative Pb-Zn, carbonate-hosted Pb-Zn (Mississippi Valley-type; MVT), and fracture-controlled replacement Zn-Pb. Other carbonate-hosted deposits studied include a magnesite deposit at Mount Brussilof and a rare-earth element-F-Ba deposit at Rock Canyon Creek, both of which lack base metals but are spatially associated with the MVT deposits in the southern Rocky Mountains. Volcanogenic massive-sulfide deposits hosted in volcanic and mixed volcanic-sedimentary host rock settings were also examined. Through field geology, geochemical (lithogeochemistry, stable and radiogenic isotopes, fluid inclusions, and mineral chemistry), and geophysical (rock properties, magnetotelluric, and seismic) tools, the TGI research contributions have advanced genetic and exploration models for volcanic- and sedimentary-hosted base-metal deposits and developed new laboratory, geophysical, and field techniques to support exploration.

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