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Sulaiman, M. I., P. A. Subakti, Haolia, D. Y. Fatimah, I. Madrinovella, A. Abdullah, D. A. Zaky, et al. "Early Results of Eastern Indonesia P-wave Tomography Study Using Regional Events." IOP Conference Series: Earth and Environmental Science 873, no. 1 (October 1, 2021): 012068. http://dx.doi.org/10.1088/1755-1315/873/1/012068.
Повний текст джерелаАнотація:
Abstract The tectonic system of Eastern Indonesia is controlled by several major and minor plates, such as Indo-Australian, Australian plate, and Pacific plates. This area is known for its complexity, and high seismic activity. This study tries to image the complex structures beneath this region by employing regional events data and seismic tomography methods. We used five years of regional events catalog provided by the Indonesian Agency of Meteorology, Climatology, and Geophysics. We have sorted 7336 events recorded between 120° – 136° longitude and 0° – 13°(-) latitude consisting of 46446 P and 15467 S wave arrival data. Relocated hypocenter map shows a better constrain location on seismicity along outer Bandar Arc. A dipping pattern of seismicity is seen that is going deeper to the Banda Sea. The seismicity map also images a steep angle pattern of seismicity that could be related to the subduction slab roll-back model at North of Wetar island. Interestingly, we spotted a seismicity gap in West Seram that could be linked with slab tear zone. The checker-board test suggests a proper resolution is still reliable to a depth of 200 km with a less interpretable model at a depth of 300 km. P-wave tomographic models image the high velocity dipping down going slab. The Banda slab is seen to subduct from south Timor Island to the north, from east Tanimbar and Aru Island to west part, and from north Seram Island to south. We observed the down-going slab meet from all directions at about 300 km beneath the Banda sea. P wave tomogram also shows the Timor Island slab has a steeper dip that agrees with the seismicity pattern. Near the Seram island, we identify a low-velocity anomaly zone infiltrate the Banda slab beneath the shallow part of West Seram, which was previously interpreted as slab tear zone. This study also noticed a higher velocity tomogram model at North of Wetar island that might indicate a back-arc thrust. Lastly, a low-velocity band is also exposed at a shallow depth close to the volcano chain along that Banda volcanic arc.
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Haq, M. S., Haolia, M. I. Sulaiman, I. Madrinovella, S. Satiawan, D. A. Zaky, S. K. Suhardja, et al. "Early Results of P Wave Regional Tomography Study at Sunda-Banda Arc using BMKG Seismic Network." IOP Conference Series: Earth and Environmental Science 873, no. 1 (October 1, 2021): 012065. http://dx.doi.org/10.1088/1755-1315/873/1/012065.
Повний текст джерелаАнотація:
Abstract The plate movement, geological structure, magmatism, and seismic activity in the area of Bali to East Nusa Tenggara are mainly related with the subducting of Indo-Australian Plate underneath the Eurasian plate. The complexity is added with the recent collision of Australian continent lithosphere with the western Banda arc, along the islands of Flores, Sumba and Timor island. Our study area is known as the Sunda-Banda arc transition. With the aim of imaging subsurface structure, we perform seismic tomography inversion using regional events. We collected 5 years of earthquake data (January 2015 – December 2019) from the Indonesian Agency of Meteorology, Climatology, and Geophysics (BMKG). The output of our data processing is not limited to only P wave velocity model, but also relocated seismicity pattern in the region. In general, seismicity pattern shows dominant shallow events in the south that progressively shift into deeper events in the north down to a few 500 km, marking a dipping subduction zone in this region. A group of shallow events down to a depth of 50 km is also seen at the norther region that may relate to back-arc thrust activity. P wave tomogram model show a lower velocity perturbation at a depth of 30 km that could be associated with magmatic activity along the volcanic front line. Higher P wave perturbation model are spotted at two different zones, the first one is marking a dipping Indo-Australian plate down to depth of 400 km. We noticed that the angle of dipping is steeper in the Eastern part compared to the Western part. The second a relatively flat at shallow depth at the northern region from the island of Lombok to Nusa Tenggara Timur that may mark the back-arc thrust region
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Fatmawati, Fatmawati, I. Made Yuliara, Ganis Riandhita, Febriyanti Jia Kelo, Audrey Vellicia, and Lintang Ardhana Reswari. "Tsunami level disaster based on simulation scenario of earthquake modeling and seismicity in South Bali 2010-2018." International journal of physics & mathematics 2, no. 1 (July 5, 2019): 36–41. http://dx.doi.org/10.31295/ijpm.v2n1.88.
Повний текст джерелаАнотація:
Bali is one of the areas prone to earthquakes and tsunamis because it is located in the meeting area of ??two plates namely the Eurasian and Indo-Australian plates located in the south of Bali and a back-arc trust zone located in the north of Bali. Research has been carried out on tsunami hazard level analysis based on scenario modeling and earthquake seismicity in southern Bali. This study uses earthquake data in January 2010 - July 2018. Tsunami prone areas in southern Bali are Klungkung district, Nusa Penida, Kuta beach, Sanur beach, Tabanan and Gianyar districts. The research conducted aims to determine the level of tsunami hazard by looking at the tsunami run up and arrival time in the southern region of Bali. This simulation model uses 1427 data which is then processed using Generic Mapping Tools (GMT) software so that seismicity maps are obtained, and tsunami modeling uses the Tsunami Observation and Simulation Terminal (TOAST) software. The results obtained from the tsunami modeling simulation in the form of altitude (run up) and tsunami wave arrival time (arrival time) which have an average value of 1,385 - 2,776 meters with an arrival time of 20-24 minutes. The tsunami hazard level is obtained in scenario A with a magnitude of 7.5 which has a maximum value of <1 meter (low) and scenario B with a magnitude of 7.8 has a maximum tsunami run-up value of 1-3 meters (medium) and in scenario C with a magnitude 8.0 has a maximum run-up of tsunami waves of 1 - 3 meters (medium).
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Luthfiyani, N., S. Rosalia, T. Yudistira, S. Widiyantoro, and A. N. T. Puspito. "Love Wave Group Velocity Extraction Using Ambient Noise Tomography in West Java, Indonesia." Journal of Physics: Conference Series 2243, no. 1 (June 1, 2022): 012019. http://dx.doi.org/10.1088/1742-6596/2243/1/012019.
Повний текст джерелаАнотація:
Abstract West Java, Indonesia, is located in the northern part of the subduction zone between the Australian and Eurasian plates, with a complex tectonic setting and high seismicity level. In 2016, Institut Teknologi Bandung (ITB) and Australia National University (ANU) deployed 85 temporary seismometers to investigate this area. We constructed the shallow crust profile by applying the Ambient Noise Tomography (ANT) method to improve our knowledge of the tectonic condition in West Java. In this research, we used the north-south (NS) and east-west (EW) components to extract the Love waves Green’s function. We first rotated the NS and EW daily data series to obtain the transverse component. We then pre-processed the transverse daily data and applied cross-correlation to all station pair data. The daily cross-correlated data is stacked to obtain the Love waves Green’s function. The Green’s function in this study is clearly seen in the 1-25 s period band. The obtained Green’s function will be analyzed further to get the Love waves group velocity which then will be inverted to obtain the shear wave velocity (Vs) profile beneath the study area.
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Baskara, Bayu, I. Ketut Sukarasa, and Ardhianto Septiadhi. "PEMETAAN BAHAYA GEMPA BUMI DAN POTENSI TSU-NAMI DI BALI BERDASARKAN NILAI SEISMISITAS." BULETIN FISIKA 18, no. 1 (February 1, 2017): 20. http://dx.doi.org/10.24843/bf.2017.v18.i01.p04.
Повний текст джерелаАнотація:
Bali is one of the areas prone to earthquake and tsunami as being at the junction of two plates, namely the Eurasian plate and the Indo-Australian plate is located in the south of Bali and back arc trust zones are located in the North of Bali. We need research on the potential dangers of earthquakes and tsunami in Bali are based on the value of seismicity which is interpreted by the value of b and a. This study uses earthquake data on the coordinates 6?-11? SLand 114?-116? EL with 339 data that was processed using Zmap in order to obtain the value of b at 1.57 ± 0.008 and the value of a is 10.6 and maximum magnitude of 7.1 Mw. From mapping the values ??of b and a known area that has the highest value of b and a lies in the sea area to the south of Bali, Karangasem and Buleleng to the northern region of Bali. Furthermore, for mapping the tsunami in Bali using the TOAST application obtained tsunami prone areas of Bali, Kuta Beach, East Buleleng and Karangasem.
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Haolia, M. I. Sulaiman, P. T. Brilianti, R. P. Nugroho, I. Madrinovella, A. Abdullah, D. A. Zaky, et al. "Preliminary Results of Double Difference Tomography at Sunda-Banda Arc." IOP Conference Series: Earth and Environmental Science 873, no. 1 (October 1, 2021): 012067. http://dx.doi.org/10.1088/1755-1315/873/1/012067.
Повний текст джерелаАнотація:
Abstract The Sunda-Arc transition to the Banda Arc is located on the south of the Flores Island, Indonesia, where the Australian lithosphere is moving to the north direction. On-going subduction process dictates the tectonic setting though some studies also suggest a collision and obduction may occur in the past due to of plate buoyancy. This area has active seismicity with frequent large magnitude events. To better understand the tectonic system in this region, we performed double-difference tomography inversion using regional events. We obtained the data catalog from the Indonesian Agency of Meteorology, Climatology, and Geophysics ranging from 116° to 125° east longitude and -6.5° to 12.5° latitude. We collected 4312 events data, detected from 15 stations from January 2015 to December 2019. Final relocated hypocenters showed a reduced fixed-depth problem and a more clustered event, although some deep events disappear. Most events are related to the subducting Benioff zone with some clustered events in the northern area may be related to back-arc thrust. We also observed clustered events near active volcano region and reduced shallow seismicity region to the west of the Timor Island. Resolution test using the checkerboard and Derivative weigh Sum (DWS) shows that fair P wave resolution can be achieved until 300 km, although a smearing start to show at a deeper depth. However, due to lack of arrival S wave data, the resolution test suggest good resolution can only be seen until a depth of 100 km. Tomogram P and S wave models show a clear dipping subducting slab from south to North down to a 250 km. We also spot a fast velocity band near the Timor Island area that similar to the previous tomography study, interpreted as sliver forearm. We spotted a band of lower Vp, lower Vs and higher Vp/Vs at shallow depth close to the volcanic line and we interpreted this as a zone of higher temperature, that may relate to magmatic activity in this region. We also noticed a zone of low velocity and higher Vp/Vs that may relate with dehydration and partial melting. However, we feel this still uncertain due to low Vs resolution.
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Pettinga, Jarg R., Mark D. Yetton, Russ J. Van Dissen, and Gaye Downes. "Earthquake source identification and characterisation for the Canterbury region, South Island, New Zealand." Bulletin of the New Zealand Society for Earthquake Engineering 34, no. 4 (December 31, 2001): 282–317. http://dx.doi.org/10.5459/bnzsee.34.4.282-317.
Повний текст джерелаАнотація:
The Canterbury region of the South Island of New Zealand straddles a wide zone of active earth deformation associated with the oblique continent-continent collision between the Australian and Pacific tectonic plates east of the Alpine fault. The associated ongoing crustal strain is documented by the shallow earthquake activity (at depths of <40 km) and surface deformation expressed by active faulting, folding and ongoing geodetic strain. The level of earth deformation activity (and consequent earthquake hazard) decreases from the northwest to the southeast across the region. Deeper-level subduction related earthquake events are confined to the northernmost parts of the region, beneath Marlborough.
To describe the geological setting and seismological activity in the region we have sub-divided the Canterbury region into eight domains that are defined on the basis of structural styles of deformation. These eight domains provide an appropriate geological and seismological context on which seismic hazard assessment can be based. A further, ninth source domain is defined to include the Alpine fault, but lies outside the region.
About 90 major active earthquake source faults within and surrounding the Canterbury region are characterised in terms of their type (sense of slip), geometry (fault dimensions and attitude) and activity (slip rates, single event displacements, recurrence intervals, and timing of last rupture). In the more active, northern part of the region strike-slip and oblique strike-slip faults predominate, and recurrence intervals range from 81 to >5,000 years. In the central and southern parts of the region oblique-reverse and reverse/thrust faults predominate, and recurrence intervals typically range from -2,500 to >20,000 years.
In this study we also review information on significant historical earthquakes that have impacted on the region (e,g. Christchurch earthquakes 1869 and 1870; North Canterbury 1888; Cheviot 1902; Motunau 1922; Buller 1929; Arthurs Pass 1929 and 1994; and others), and the record of instrumental seismicity. In addition, data from available paleoseismic studies within the region are included; and we also evaluate large potential earthquake sources outside the Canterbury region that are likely to produce significant shaking within the region. The most important of these is the Alpine fault, which we include as a separate source domain in this study.
The integrated geological and seismological data base presented in this paper provide the foundation for the probabilistic seismic hazard assessment for the Canterbury region, and this is presented in a following companion paper in this Bulletin (Stirling et al. this volume).
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Santoso, D., E. J. Wahyudi, W. G. A. Kadir, S. Alawiyah, A. D. Nugraha, P. Supendi, and W. W. Parnadi. "Gravity Structure around Mt. Pandan, Madiun, East Java, Indonesia and Its Relationship to 2016 Seismic Activity." Open Geosciences 10, no. 1 (December 31, 2018): 882–88. http://dx.doi.org/10.1515/geo-2018-0069.
Повний текст джерелаАнотація:
Abstract Java Island is part of the island arc influenced by subducting Indo-Australian beneath Eurasian tectonic plates, therefore there is high seismic activity and an active volcanic chain trending East-West. One of the volcanoes in Java Island is Mt. Pandan, northern part of Madiun, East Java region, which is known as one of the dormant volcano in the region. According to the list of volcanoes in Indonesia Mt. Pandan is not classified as an active volcano. The previous studies mentioned that Mt. Pandan is a modern volcano which is located in the Kendeng zone. On June 25, 2015, there was felt earthquake (M 4.2) causing several houses damaged around Mt. Pandan as reported by Agency for Meteorology, Climatology, Geophysics (BMKG), Indonesia and then in February 2016, more than twenty small earthquakes (M < 4) occurred again in the area. In order to understand the structure beneath Mt. Pandan, we have conducted gravity measurement and seismicity analysis through hypocenter relocation. Our results show prominent low gravity and density anomalies by forward modeling derived from residual anomaly around Mt. Pandan area. The clusters of small earthquakes appear at depths of less than 30 km beneath Mt. Pandan. The selected focal mechanism of the event in the area is left-lateral faulting in the north and oblique dominant thrust in the south of Mt. Pandan. Some indications related to submagmatic activities such as hot springs and warm ground is found. Our interpretation is this phenomenon may be related to tectonic and magmatic activities. On the other hand, it confirms also that Mt. Pandan is probably a modern volcanic center.
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Beaudouin, Thierry, Oliver Bellier, and Michel Sebrier. "Present-day stress and deformation field within the Sulawesi Island area (Indonesia) : geodynamic implications." Bulletin de la Société Géologique de France 174, no. 3 (May 1, 2003): 305–17. http://dx.doi.org/10.2113/174.3.305.
Повний текст джерелаАнотація:
Abstract Sulawesi Island, eastern Indonesia, is located at the junction between the Pacific-Philippine, Indo-Australian Plates, and the Sunda Block, i.e., the southeastern edge of the Eurasian Plate (fig. 1). Its peculiar shape results from an on-going complex history of collision and rotation of continental slivers, island arcs, and oceanic domains with respect to the Sunda Block. Seismic network document a high level of seismicity in its northern boundaries, corresponding to deformation along the North Sulawesi trench and within the Molucca Sea subduction (fig. 1). Seismic activity is lower in central and south Sulawesi (fig. 4). It represents the activity of the NE, SW and SE arms thrust and the left-lateral Central Sulawesi Fault System, which comprises the Palu-Koro and Matano fault zones. This system connects, from northwest to southeast, the North Sulawesi Subduction zone to the Sorong fault (through th Sud Sula fault, after, Hinschberger et al. [2000] and the Tolo thrust in the North Banda Sea, Silver et al., [1983] proposed a deformation model that implies a clockwise rotation of the Sula block that is limited to the west and south by the Central Sulawesi Fault System. Paleomagnetic [Surmont et al., 1994] and GPS [Walpersdorf et al., 1998a] studies confirm and measure this rotation. In order to discus the present day kinematics and deformation of Sulawesi area, we performed a seismotectonic study, using focal mechanism of moderate and large (Mw ≥ 5) shallow earthquake (≤ 60 Km), collected from the Harverd CMT database (period 1976 to 2001) and complemented by Fitch [1972] and Cardwell [1980] (period 1964–1976). From these focal mechanisms and the known structural context, we defined ten homogeneous deformation domains (fig. 3 et fig.5). For seven of these, focal solution and moment tensors were inverted (Carey-Gailhardis and Mercier method [1987Carey-Gailhardis and Mercier method [1992]) and summed, in order to obtain stress and deformation tensors and rate estimates (Brune [1968] or Kostrov [1974] methods). Results are presented in table I, on figure 2 and figure 3. In northern Molucca Sea (north of equvator), the fast convergence slip rate (75 mm/a) is absorbed by the Sangihe subduction and accommodates the major part of the Philippines/Sunda plates motion. South of the equator, the estimated slip rate is only 2 mm/yr and represents the Sangihe slap subduction, which is affected by a torsion from NNE to E strike. Along the North-Sulawesi fault system, direction of the stress axes are not significantly different from east to west (average N356°±5E), but the determined slip rates increase from 20±4 mm/a to 54±10 mm/a, respectively. These values agree with the Sula block rotation pole previously proposed and located at the eastern extremity of the Northern Arm. The Palu-Koro fault, bounding the western Sula block, contributes to this rotaion because its trace fits well a small circle centered on the pole. However, seisicity document few moderate magnitude earthquake (fig. 4) related to the left lateral Central Sulawesi fault system, despite many identified active tectonic feature [Beaudouin, 1998]. Moreover, geologically determined Palu-Koro long-term slip rate of 35±8 mm/a, [Bellier et al., 2001] agrees with the far-field strike-slip rate of 32–45 mm/a proposed from GPS measurement [Walpersdorf et al., 1998b ; Stevens et al., 1999]. This confirms that is a fast slipping fault with a relatively low level of seismicity. The southeastern limit of the Sula block is represented by the ENE-trending Sorong strike-slip fault that extends from Irian-Jaya island to the east coast of Sulawesi where it connects to the Matano fault through the South Sula fault, This structure is particularly active south of the Sula island with a major Mw=7.7 earthquake (29/11/98). The inversion provides a strike-slip regime with respectively N220°E and N310°E-trending σ1. and σ3 stress axes. This study also highlight the Sula block internal deformation that could explain in the GPS velocities model obtained by walpersdorf et al. [1998a] for the Sula block rotation. We evidence an extensional stress regime with a N030°E-trending σ3, in the southern part of the Tomini Gulf. The estimated extension rate is 9 mm/a toward a N036°E direction. Considering the location of the Tomini Gulf, this deformation could be interpreted as a back-arc spreading related to the North Sulawesi subduction. The Batui zone correspond to the domain of the collision wich occured in the early-middle Plicene [e.g., Velleneuve et al., 2000] between the NE arm and the Irian-jaya derived Banggaï-Sula block. This domain remains active (12 earthquake with a major one of Mw=7.6, 14/05/00, fig. 4) but is mainly affected by strike-slip deformation. The Tolo thrust, lying off the SE arm east coast, absorbs the convergence to the west of the North Banda Sea, as attested by six moderate earthquake with reverse faulting focal mechanisms. This allows to distinguish a North-Banda block in SE Sulawesi, bounded by the South Sula segment of the Sorong fault, the Tolo thrust and the Hamilton fault (fig. 5) and moving westward at a lower rate than the Sula block. The SW arm of Sulawesi is also characterised by a compressional stress regime with N099°E-trending σ1 and an estimated convergence rate of 8.5 mm/a toward a N080°E direction. This is the consequence of the Majene-Kalosi thrust activity and could represent the most western accommodation of the Philippines/Sunda plates motion.
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Lubis, Lailatul Husna, Arwi Anti Ayundita, Novita Sari, and Wisnu Wardono. "AKTIVITAS SEISMISITAS DI WILAYAH SUMATERA BAGIAN UTARA MENGGUNAKAN ARC-GIS PERIODE 2020-2021." Jurnal Kumparan Fisika 5, no. 2 (September 28, 2022): 91–98. http://dx.doi.org/10.33369/jkf.5.2.91-98.
Повний текст джерелаАнотація:
ABSTRAKPulau Sumatera merupakan daerah yang tinggi akan tingkat kegempaannya yang disebabkan karena berada pada daerah pertemuan antara dua lempeng yaitu Indo-Australia dibagian selatan dan lempeng Eurasia dibagian utara. Sumatera bagian Utara terletak pada koordinat 0o – 5o LU dan 96o – 101o BT. Tujuan dari penelitian ini untuk mengetahui aktivitas gempa bumi di wilayah Sumatera bagian Utara berdasarkan magnitudo dan kedalamannya pada tahun 2020 – 2021. Data yang digunakan berasal dari katalog gempa bumi BMKG Deli Serdang. Metode yang digunakan adalah metode kuantitatif dan deskriptif serta pemetaannya menggunakan aplikasi Arc-GIS 10.3. Hasil penelitian menunjukkan bahwa wilayah Sumatera bagian Utara pada tahun 2020 sampai 2021 memiliki tingkat kegempaan yang tinggi. Pada tahun 2020, gempa bumi yang terjadi sebanyak 1.352 kejadian dengan rentang magnitudo M1,2 hingga M4,9 dan rentang kedalaman 1 km hingga 750 km. Sedangkan pada tahun 2021, gempa bumi yang terjadi sebanyak 2.994 kejadian dengan rentang magnitudo M1,1 hingga M4,9 dan rentang kedalaman 1 km hingga 276 km.Kata Kunci : Sumatera, Gempa bumi, magnitudo, kedalaman. ABSTRACTThe island of Sumatra is an area that has a hig level of seismicity due to its location at the confluence of two plates, namely the Indo-Australia plate in the south and the Eurasian plate in the north. North Sumatra is located at coordinate 0o – 5o North Latitude and 96o – 101o East Longitude. The purpose of this study is to determine earthquake activity in the nothern Sumatra region based on its magnitude an depth in 2020-2021. The data used comes from the BMKG Deli Serdang earthquake catalog. The results of the study show that the northern part of Sumatra in 2020 to 2021 has a high level of seismicity. In 2020, there were 1,352 earthquakes with a magnitude range of M1,2 to M4,9 and da depth range of 1 km to 750 km. Meanwhile, in 2021, 2,994 earthquakes occurred with a magnitude range of M1,1 to M4,9 and a depth range of 1 km to 276 km.Keywords : Sumatera, earthquakes, magnitude, depth
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Lin, Xiangdong, Huaiyu Yuan, Michael C. Dentith, Ruth Murdie, Klaus Gessner, and Avinash Nayak. "Improved full waveform moment tensor inversion of Cratonic intraplate earthquakes in southwest Australia." Geophysical Journal International 227, no. 1 (May 31, 2021): 123–45. http://dx.doi.org/10.1093/gji/ggab214.
Повний текст джерелаАнотація:
SUMMARY In contrast to global observations in stable continental crust, the present-day orientation of the maximum horizontal stress in Western Australia is at a high angle to plate motion, suggesting that in addition to large-scale plate driving forces, local factors also play an important role in stress repartitioning. As a reliable stress indicator, full waveform moment tensor solutions are calculated for earthquakes that occurred between 2010 and 2018 in the southern Yilgarn Craton and the adjacent Albany-Fraser Orogen in southwestern Australia. Due to regional velocity heterogeneities in the crust, we produced two geographically distinct shear wave velocity models by combining published crustal velocity models with new ambient noise tomography results. We applied a full waveform inversion technique to 15 local earthquakes and obtained 10 robust results. Three of these events occurred near Lake Muir in the extreme south of the study area within the Albany-Fraser Orogen. The focal mechanism of the 16th September 2018 Lake Muir event is thrust; two ML≥ 4.0 aftershocks are normal and strike-slip. Our results are consistent with field observations, fault orientations inferred from aeromagnetic data and surface displacements mapped by Interferometric Synthetic Aperture Radar which are all consistent with reactivation of existing faults. The other seven solutions are in the southeastern Yilgarn Craton. These solutions show that the faulting mechanisms are predominantly thrust and strike-slip. This kinematic framework is consistent with previous studies that linked active seismicity in the Yilgarn Craton to the reactivation of the NNW–SSE oriented Neoarchean structures by an approximately E–W oriented regional stress field. Our results suggest that the kind of faulting that occurs in southwest Australia is critically dependent on the local geological structure. Thrust faulting is the dominant rupture mechanism, with some strike-slip faulting occurring on favourably oriented structures.
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Tang, Yuxiang, Nelson Lam, Hing-Ho Tsang, and Elisa Lumantarna. "Use of Macroseismic Intensity Data to Validate a Regionally Adjustable Ground Motion Prediction Model." Geosciences 9, no. 10 (September 30, 2019): 422. http://dx.doi.org/10.3390/geosciences9100422.
Повний текст джерелаАнотація:
In low-to-moderate seismicity (intraplate) regions where locally recorded strong motion data are too scare for conventional regression analysis, stochastic simulations based on seismological modelling have often been used to predict ground motions of future earthquakes. This modelling methodology has been practised in Central and Eastern North America (CENA) for decades. It is cautioned that ground motion prediction equations (GMPE) that have been developed for use in CENA might not always be suited for use in another intraplate region because of differences in the crustal structure. This paper introduces a regionally adjustable GMPE, known as the component attenuation model (CAM), by which a diversity of crustal conditions can be covered in one model. Input parameters into CAM have been configured in the same manner as a seismological model, as both types of models are based on decoupling the spectral properties of earthquake ground motions into a generic source factor and a regionally specific path factor (including anelastic and geometric attenuation factors) along with a crustal factor. Unlike seismological modelling, CAM is essentially a GMPE that can be adapted readily for use in different regions (or different areas within a region) without the need of undertaking any stochastic simulations, providing that parameters characterising the crustal structure have been identified. In addressing the challenge of validating a GMPE for use in an area where instrumental data are scarce, modified Mercalli intensity (MMI) data inferred from peak ground velocity values predicted by CAM are compared with records of MMI of past earthquake events, as reported in historical archives. South-Eastern Australia (SEA) and South-Eastern China (SEC) are the two study regions used in this article for demonstrating the viability of CAM as a ground motion prediction tool in an intraplate environment.
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Keppel, Mark N., Karl Karlstrom, Laura Crossey, Andrew J. Love, and Stacey Priestley. "Evidence for intra-plate seismicity from spring-carbonate mound springs in the Kati Thanda–Lake Eyre region, South Australia: implications for groundwater discharge from the Great Artesian Basin." Hydrogeology Journal 28, no. 1 (November 6, 2019): 297–311. http://dx.doi.org/10.1007/s10040-019-02049-1.
Повний текст джерела
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Ridwan, M., Y. Yatini, and S. Pramono. "Mapping of Potential Damages Area in Lombok Island Base on Microtremor Data." Jurnal Pendidikan Fisika Indonesia 17, no. 1 (May 2, 2021): 49–59. http://dx.doi.org/10.15294/jpfi.v17i1.27028.
Повний текст джерелаАнотація:
Lombok Island and its surrounding is an area that has a high seismicitys level because it is located in the Eastern Sunda Arc. Tectonically, Lombok Island located between the Indo-Australia plate collision zone with Eurasia in the south and the fult of the backarc Bali-Flores in the north. This research’s purposed to determine the distribution of vulnerability index and peak ground acceleration value are used to determine the GSS value, so mapping of potential damage areas could be done. The microtremor data taken on 32 observation points distributed in Lombok Island. Microtremor data is analysed using Horizontal to Vertical Spectral Ratio (HVSR) method to get seismic vulnerability index (Kg) and dominant period. Determination of Peak Ground Acceleration (PGA) value using data from the MASE Stasion measurement results based on earthquake events on August 5, 2018. Seismic vulnerability index and peak ground acceleration value are used to determine the GSS value. Determination of potential damage area using analysis of the dominant period, seismic vulnerability indexs and Ground Shear Strain values. The results of this research showed that seismic vulneribility index value in research area is about 0,029 sekon to 1,360 sekon, seismic vulneribility index value is about 0,56 to 189,92 and GSS value is about 2,52 x 10-5 to 8,46 x 10-3. The results show that the light damage dominated in East Lombok Districts, the moderate damage is on Mataram City and it dominated in West Lombok Districts. The heavy damage present in the most parts of West Lombok Districts.
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Ramadhan, Daffa Galuh, and Madlazim . "PENCITRAAN RUPTURE GEMPABUMI SUMATERA BARAT 2 MARET 2016, MW 7,9 MENGGUNAKAN METODE MUSICBP." Inovasi Fisika Indonesia 11, no. 1 (February 10, 2022): 28–34. http://dx.doi.org/10.26740/ifi.v11n1.p28-34.
Повний текст джерелаАнотація:
Abstrak
Sumatera Barat merupakan daerah yang memiliki tingkat seismisitas sangat tinggi. Gempabumi berkekuatan besar sering melanda daerah ini baik di wilayah daratan maupun lautan. Amplitudo dari gempabumi berkekuatan besar selalu memicu terbentuknya zona segmentasi rupture. Penelitian ini bertujuan untuk menganalisis karakteristik rupture dari gempabumi Mw 7,9 yang terjadi di daerah Sumatera Barat pada tanggal 2 Maret 2016. Karakteristik dari rupture yang dihasilkan berupa nilai durasi, panjang, kecepatan, dan arah rupture. Metode yang digunakan ialah Multiple Signal Back-Projection (MUSICBP) menggunakan filter band pass dengan rentang 0,25 – 1 Hz. Data yang digunakan didapatkan dari website IRIS Wilber 3 dengan pengaturan event gempa teleseismik. Data gempabumi dengan format SAC yang digunakan direkam oleh stasiun Array Ausralia sebanyak 60 stasiun. Data SAC dari gempabumi tersebut diolah menggunakan cross correlation sehingga diperoleh sinyal yang koheren dan sefase. Hasil dari pemrosesan data berupa arah rambat rupture yang memiliki arah utara-selatan (north-south ) secara bilateral dengan panjang rupture 90 km dan berdurasi 40 detik. Gempabumi ini berjenis intraplate earthquake dengan mekanisme gempa strike slip. Selain itu, Gempabumi ini juga memiliki episenter gempa yang berada di Cekungan Wharton Samudera Hinda. Berdasarkan hasil regresi linier dari durasi dan panjang rupture maka dapat diketahui nilai kecepatan rambat rupture yaitu 2,3 km/s. Hasil pencitraan rupture gempabumi ini divalidasi menggunakan lokasi gempa susulan – gempa susulan dan didapatkan bahwa lokasi gempa susulan – gempa susulan terletak di zona segmentasi rupture gempabumi tersebut.
Kata Kunci: Gempabumi Sumatera, Karakteristik Rupture, Multiple Signal Back-Projection.
Abstract
West Sumatra is an area that has a very high level of seismicity. Large earthquakes often hit this area both on land and sea. The amplitude of a large earthquake always triggers the formation of segmentation zone rupture. This study aims to analyze the characteristics rupture of the earthquake Mw 7.9 that occurred in West Sumatra on March 2, 2016. The characteristics of rupture the resulting are the duration, length, velocity, and direction of the rupture. The method used is Multiple Signal Back-Projection (MUSICBP) using a band pass filter with a range of 0.25 – 1 Hz. The data used is obtained from the IRIS Wilber 3 website with settings event teleseismic earthquake. Earthquake data in the SAC format used was recorded by Array 60 stations from Australia. The SAC data from the earthquake was processed using cross correlation to obtain a coherent and in-phase signal. The result of data processing is the direction of propagation rupture which has a north-south direction bilaterally with a length of rupture 90 km and a duration of 40 seconds. This earthquake is an intraplate earthquake with an earthquake mechanism strike slip. In addition, this earthquake also has an epicenter in the Wharton Basin of the Indian Ocean. Based on the results of linear regression of the duration and length of the rupture, it can be seen that the value of the velocity rupture is 2.3 km/s. The results of imaging rupture this earthquake were validated using the location of the aftershock – aftershocks and it was found that the location of the aftershock – aftershock was located in the segmentation zone of the rupture earthquake.
Keywords: Sumatran Earthquake, Characteristics Rupture, Multiple Signal Back-Projection.
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Rajif, Mudzullah, and Syafriani Syafriani. "HAZARD SEISMIC ZONATION ANALYSIS OF WEST SUMATRA REGION USING PROBABILISTIC HAZARD SEISMIC ANALYSIS (PHSA) METHOD." PILLAR OF PHYSICS 14, no. 1 (July 12, 2021). http://dx.doi.org/10.24036/10753171074.
Повний текст джерелаАнотація:
Indonesia is one of the countries that is prone to high intensity seismicity, where Indonesia is located between three main plates, namely the Eurasian plate in the north, the Indo-Australian plate in the south and the Pacific plate in the northeast. As a result of the meeting of the three plates, Indonesia has a high level of seismicity both on land and at sea. One of the provinces with a high level of earthquake hazard is West Sumatra. Seismic hazards are useful in designing earthquake-resistant buildings and can describe the effects of earthquakes at a location which will help in anticipating community preparedness and earthquake disaster mitigation efforts. This type of research is descriptive, namely by collecting catalog data for the NEIC / USGS earthquake with the period 1969-2019 with M ≥ 5 S.R. Seismic hazard data processing uses the probabilistic seismic hazard analysis (PSHA) method. PSHA is based on earthquake parameters that produce the greatest ground motion. The magnitude of the intensity at a location due to an earthquake in the earthquake source area with a magnitude M and a distance of R can be used as an attenuation function. The attenuation function used in this study is Joyner-Boore (1997) and Young et al (1997). The results show that the largest seismic hazard occurs in the PGA with a maximum range of 1.28 g - 3.69 g in the Mentawai Islands region. The seismic hazard level is in the Bukit Barisan area with a maximum PGA value of 1.72 g - 2.12 g.
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Muttaqy, Faiz, Andri Dian Nugraha, Nanang T. Puspito, David P. Sahara, Zulfakriza Zulfakriza, Supriyanto Rohadi, and Pepen Supendi. "Double-difference earthquake relocation using waveform cross-correlation in Central and East Java, Indonesia." Geoscience Letters 10, no. 1 (January 14, 2023). http://dx.doi.org/10.1186/s40562-022-00259-2.
Повний текст джерелаАнотація:
AbstractThe Central and East Java region, which is part of the Sunda Arc, has relatively high seismic rates due to the convergence of two major tectonic plates in the Indonesian region; i.e., the Indo-Australian Plate subducting under the Eurasian Plate. Many devastating earthquakes have occurred in this area as a result of the interaction between these two plates. Two examples are the 1994 Banyuwangi earthquake (Mw 7.6) and the 2006 Yogyakarta earthquake (Mw 6.3). This study aims to determine precise earthquake locations and analyze the pattern of seismic distribution in Central and East Java, Indonesia. We manually re-picked P and S-wave arrival times that were recorded by the Agency for Meteorology, Climatology and Geophysics (BMKG) of the Indonesian earthquake network during the time period January 2009–September 2017. We then determined the earthquake locations using a non-linear method. To improve the accuracy of the earthquake locations, we relocated 1,127 out of 1,529 events, using a double-difference algorithm with waveform cross-correlation data. Overall, the seismicity in the Central and East Java region is predominantly distributed in the south of Java Island; e.g., the Kebumen, Yogyakarta, Pacitan, Malang, and Banyuwangi clusters. These clusters are probably related to the subduction activity in these regions. Meanwhile, there are clusters of earthquakes having shallow depths on the mainland that indicate the activity of inland faults in the region; e.g., the Opak Fault, the Kendeng Thrust, and the Rembang–Madura–Kangean–Sakala (RMKS) Fault Zone. Several other active inland faults have not shown any significant seismicity over the time period mentioned, i.e., the Pasuruan Fault, the Lasem Fault, the Muria Fault, the Semarang Thrust, and the Probolinggo Fault.
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Tiara Aurora, Maulita, Aisyah Nur Islamiyati, Bimo Kusumahasto, and Wahyu Budi Santosa. "ANALISIS MORFOTEKTONIK SESAR OPAK SEBAGAI APLIKASI MITIGASI BENCANA GEMPA BUMI YOGYAKARTA." PROSIDING SNAST, November 12, 2022, B20–29. http://dx.doi.org/10.34151/prosidingsnast.v8i1.4111.
Повний текст джерелаАнотація:
The Special Region of Yogyakarta is an area with tectonic activity marked by earthquake. The tectonic activity is caused by the collision of Indo-Australian plate and Eurasian plate that occurs in the southern part of the island of Java. The 2006 earthquake that occurred in the Special Region of Yogyakarta and was the most destructive is thought to have been caused by the Opak Fault which experienced relative north-south shift. Further research on the activities of Opak Fault is needed to design appropriate mitigation measures to minimize the negative impacts that will be caused. The method used in this study is morphotectonic analysis to predict tectonicactivity by performing calculations and image analysis. Calculations and data processing by calculating the value of the Valley Floor, sinuosity mountain floor, and velocity shear 30 using Global Mapper, Arcgis, and Microsoft Excel software. Digital elevation model (DEM) images, google earth images, vs30 maps and shapefile data for the districts of Bantul, Kulonprogo, Yogyakarta, Klaten and Gunungkidul as regional geological maps were used as primary data for the analysis. The result, geological structures and earthquakes contribute actively in shaping the appearance of area where there are active faults. The assessed morphotectonic analysis is method that is assessed and assesses the effectiveness of failure through a geomorphological approach. The research area,namely the Pleret and Segoroyoso areas, is included in area that has a high level of seismicity that causes alertness and appropriate mitigation measures against earthquake reactivation that can occur and trigger earthquakes again.
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Sellmann, Schirin, Mark Quigley, Brendan Duffy, Haibin Yang, and Dan Clark. "Fault geometry and slip rates from the Nullarbor and Roe Plains of south‐central Australia: insights into the spatial and temporal characteristics of intraplate seismicity." Earth Surface Processes and Landforms, September 30, 2022. http://dx.doi.org/10.1002/esp.5490.
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