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Identifying the most explainable fault ruptured of the 2018 Palu-Donggala earthquake in Indonesia using coulomb failure stress and geological field report

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Geodesy and Geodynamics 2020年第4期11卷 252-257页

作者： Endra Gunawan sri widiyantoro Pepen Supendi Takuya Nishimura Global Geophysics Research Group Faculty of Mining and Petroleum EngineeringBandung Institute of TechnologyIndonesia Agency for Meteorological Climatological and GeophysicsIndonesia Disaster Prevention Research Institute Kyoto UniversityJapan Faculty of Engineering Maranatha Christian University BandungIndonesia

This study investigates the relation between the Coulomb failure stress of the mainshock with the aftershocks sequence following the 2018 Palu-Donggala earthquake in *** calculate the Coulomb failure stress using the available coseismic fault models,which had varied moment magnitudes between M_W7.53~M_*** interpretations of the fault sources were suggested by previous *** two fault models suggested that one inland fault segment ruptured during the earthquake,another fault model proposed that two fault segments ruptured inland of Central Sulawesi and along the coast of Palu *** further overlay the positive and negative values of Coulomb failure stress with the reported relocated *** find that only by conducting Coulomb failure stress analysis,we can not favour the preference of the coseismic fault which explains aftershock *** investigation demonstrates that additional observational data from geological field surveys are required to identify the surface rupture in comparison with the coseismic fault model.

关键词： The 2018 Palu-Donggala earthquake Aftershocks Coulomb failure stress Geological field report

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维普期刊数据库

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Double-difference tomography of P- and S-wave velocity structure beneath the western part of Java, Indonesia

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Earthquake Science 2019年第1期32卷 12-25页

作者： Shindy Rosalia sri widiyantoro Andri Dian Nugraha Pepen Supendi Faculty of Mining and Petroleum Engineerings Institute of Technology Bandung^Bandung 40132 Indonesia MeteorologicalClimatological and Geophysical Agency(BMKG)Bandung 40161Indonesia

West Java in the western part of the Sunda Arc has a relatively high seismicity due to subduction activity and *** this study,double-difference tomography was used to obtain the 3D velocity tomograms of P and S waves beneath the western part of *** infer the geometry of the structure beneath the study area,precise earthquake hypo・center determination was first performed before tomographic *** this,earthquake waveform data were extracted from the regional Meteorological,Climatological,Geophysical Agency(BMKG)network of Indonesia from South Sumatra to Central *** P and S arrival times for about 1,000 events in the period April 2009 to July 2016 were selected,the key features being events of magnitude>3,azimuthal gap8.A nonlinear method using the oct-tree sampling algorithm from the NonLinLoc program was employed to determine the earthquake *** hypocenter locations were then relocated using double-difference tomography(tomoDD).A significant reduction of travel-time(root mean square basis)and a better clustering of earthquakes were achieved which correlated well with the geological structure in West ***-difference tomography was found to give a clear velocity structure,especially beneath the volcanic arc area,i.e.,under Mt Anak Krakatau,Mt Salak and the mountains complex in the southern part of West *** velocity anomalies for the P and S waves as well as the vp/vs ratio below the volcanoes indicated possible partial melting of the upper mantle which ascended from the subducted slab beneath the volcanic arc.

关键词： West Java P-and S-wave velocity structures double-difference tomography

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Relocation of hypocenters from DOMERAPI and BMKG networks： a preliminary result from DOMERAPI project

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Earthquake Science 2017年第2期30卷 67-79页

作者： Mohamad Ramdhan sri widiyantoro Andri Dian Nugraha Jean-Philippe Métaxian Asep Saepuloh Said Kristyawan Andry Syaly Sembiring Agus Budi Santoso Antoine Laurin Ahmad Ali Fahmi Study Program of Earth Sciences Faculty of Earth Science andTechnology Institute of Technology Bandung Jalan Ganesa No.10 Bandung 40132 Indonesia Agency for Meteorology Climatology and Geophysics(BMKG) Jakarta Indonesia Global Geophysics Research Group Faculty of Mining andPetroleum Engineering Institute of Technology Bandung JalanGanesa No. 10 Bandung 40132 Indonesia Research Center for Disaster Mitigation Institute of TechnologyBandung Jalan Ganesa No. 10 Bandung 40132 Indonesia ISTerre IRD R219 CNRS Universite de Savoie Mont BlancLe Bourget-du-Lac France Faculty of Earth Sciences and Technology Institute of Technology Bandung Jalan Ganesa No. 10 Bandung 40132Indonesia Center for Volcanology and Geological Hazard Mitigation Geological Agency Jalan Diponegoro No. 57 Bandung 40122Indonesia

Merapi volcano located in central Java, Indonesia,is one of the most active stratovolcanoes in the world. Many Earth scientists have conducted studies on this volcano using various methods. The geological features around Merapi are very attractive to be investigated because they have been formed by a complex tectonic process and volcanic activities since tens of millions of years ago. The southern mountain range, Kendeng basin and Opak active fault located around the study area resulted from these processes. DOMERAPI project was conducted to understand deep magma sources of the Merapi volcano comprehensively. The DOMERAPI network was running from October 2013 to mid-April 2015 by deploying 46 broad-band seismometers around the volcano. Several steps, i.e., earthquake event identification,arrival time picking of P and S waves, hypocenter determination and hypocenter relocation, were carried out in this study. We used Geiger＇s method（Geiger 1912） for hypocenter determination and double-difference method for hypocenter relocation. The relocation result will be used to carry out seismic tomographic imaging of structures beneath the Merapi volcano and its surroundings. For the hypocenter determination, the DOMERAPI data were processed simultaneously with those from the Agency for Meteorology, Climatology and Geophysics（BMKG） seismic network in order to minimize the azimuthal gap. We found that the majority of earthquakes occurred outside the DOMERAPI network. There are 464 and 399 earthquakes obtained before and after hypocenter relocation, respectively. The hypocenter relocation result successfully detects some tectonic features, such as a nearly vertical cluster of events indicating a subduction-related backthrust to the south of central Java and a cluster of events to the east of Opak fault suggesting that the fault has an eastward dip.

关键词： Earthquake Relocation DOMERAPI BMKG Tectonic feature

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Mantle flow induced by the interplay of downgoing slabs revealed by seismic anisotropy beneath the Sula Block in eastern Indonesia

Mantle flow induced by the interplay of downgoing slabs reve...

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2023年中国地球科学联合学术年会

作者：曹令敏吕川川何小波 Tianyao Hao sri widiyantoro Pepen Supendi Nicholas Rawlinson Liang Zhao Huaiyu Yuan Minghui Zhao Xuelin Qiu Muhammad Rafi Alfian Alfian David Sahara 中科院南海所剑桥大学浙江海洋大学中科院地质地球所 Faculty of Mining and Petroleum Engineering InstitutTeknologi Bandung University of Cambridge Institute of Geology and Geophysics Chinese Academy of Sciences Macquarie University Hasanuddin University InstitutTeknologi Bandung

Adjacent subduction zones with horizontal overlapping subducting slabs in the upper mantle have unclear dynamic interactions. The North Sulawesi subduction zone is characterized by southward subduction of the Celebes Sea slab to a depth of 50 km, mainly overlying the Sangihe slab that subducts west from the Molucca Sea and penetrates the mantle transition zone.

关键词： Mantle flow induced by the interplay of downgoing slabs revealed by seismic anisotropy beneath the Sula Block in eastern Indonesia Block

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