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Earthquake Geology of the Lembang Fault, West Java, Indonesia
Daryono M.R.a,b, Natawidjaja D.H.a, Sapiie B.b, Cummins P.c
a RC for Geotechnology, Indonesian Institutes of Sciences (LIPI), Indonesia
b Institute of Technology Bandung (ITB), Indonesia
c Australia National University (ANU), Indonesia
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© 2018 Elsevier B.V.The Lembang Fault is a major fault in western Java that skirts the northern edge of Bandung, one of Indonesia’s largest cities, just south of the active Tangkuban Perahu volcano. Although it has no recorded or historical large earthquakes, the Lembang Fault shows obvious geomorphic evidence of recent activity and has long been thought to be active. In this study, we use geomorphic analysis to unequivocally establish that the fault has a dominantly sinistral sense of movement with a slip rate of 1.95–3.45 mm/yr. This proves that the fault is accommodating trench parallel slip resulted from a slight obliquity in plate convergence at the JavaTrench. With a length of 29 km, this suggests that the Lembang Fault could produce a Mw 6.5–7.0 earthquake with a recurrence time of 170–670 years. We also conducted paleoseismological trenching of the Lembang Fault and found evidence for at least 3 earthquakes in the 15th century, 2300–60 BCE and 19,620–19,140 BP. The 2300–60 BCE earthquake had a measurable vertical displacement of 40 cm, which is consistence with a Mw 6.5 earthquake. This is the first mapping of a source of crustal earthquakes in Java, Indonesia, the world’s most densely populated island in one of its most tectonically active areas. The Lembang Fault and other faults in Java are likely to pose substantial risk to not only Bandung but many of Java’s major urban agglomerations.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Active fault,Crustal earthquakes,Geomorphic analysis,Geomorphic evidence,IFSAR,Slip rates,Urban agglomerations,Vertical displacements[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Active faults,IFSAR,Lembang Fault,LIDAR,Paleoseismological trenching,Slip rate[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text][{‘$’: ‘We are grateful to Australian Department of Foreign Affairs and Trade for the financial support for the Graduate Research for Earthquake and Active Tectonics (GREAT) – Institute Teknologi Bandung (ITB), Research Centre for Geotechnology – Indonesian Institutes of Sciences (LIPI). We thank Bambang S. Widoyoko, Nandang Supriatna, Dadan D. Wardhana, Purna S. Putra and Ilham Arisbaya for georesistivity assistance. We thank Ayu, Januar Ridwan and Eka Gamara for assistance during geological mapping. Indonesian Volcanologists and PVMBG colleagues Sri Hidayati, Ahmad Solikhin, Supartoyo, Imun Maimunah and Afif. We thank Rob Govers (Tectonophysics), Rishav Mallick (Earth Observatory of Singapore) and Noelynna T. Ramos (University of Phillipines) for constructive comment and suggestion to improve the manuscript.’}, {‘$’: ‘We are grateful to Australian Department of Foreign Affairs and Trade for the financial support for the Graduate Research for Earthquake and Active Tectonics (GREAT) – Institute Teknologi Bandung (ITB), Research Centre for Geotechnology – Indonesian Institutes of Sciences (LIPI). We thank Bambang S. Widoyoko, Nandang Supriatna, Dadan D. Wardhana, Purna S. Putra and Ilham Arisbaya for georesistivity assistance. We thank Ayu, Januar Ridwan and Eka Gamara for assistance during geological mapping. Indonesian Volcanologists and PVMBG colleagues Sri Hidayati, Ahmad Solikhin, Supartoyo, Imun Maimunah and Afif. We thank Rob Govers (Tectonophysics), Rishav Mallick (Earth Observatory of Singapore) and Noelynna T. Ramos (University of Phillipines) for constructive comment and suggestion to improve the manuscript.’}][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1016/j.tecto.2018.12.014[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]