On the potential for megathrust earthquakes and tsunamis off the southern coast of West Java and southeast Sumatra, Indonesia

Pepen Supendi (), Sri Widiyantoro, Nicholas Rawlinson, Tatok Yatimantoro, Abdul Muhari, Nuraini Rahma Hanifa, Endra Gunawan, Hasbi Ash Shiddiqi, Iswandi Imran, Suci Dewi Anugrah, Daryono Daryono, Bambang Setyo Prayitno, Suko Prayitno Adi, Dwikorita Karnawati, Lutfi Faizal and Ruben Damanik
Additional contact information
Pepen Supendi: University of Cambridge
Sri Widiyantoro: Institut Teknologi Bandung
Nicholas Rawlinson: University of Cambridge
Tatok Yatimantoro: Agency for Meteorology, Climatology, and Geophysics
Abdul Muhari: National Disaster Management Authority
Nuraini Rahma Hanifa: National Research and Innovation Agency
Endra Gunawan: Institut Teknologi Bandung
Hasbi Ash Shiddiqi: University of Bergen
Iswandi Imran: Institut Teknologi Bandung
Suci Dewi Anugrah: Agency for Meteorology, Climatology, and Geophysics
Daryono Daryono: Agency for Meteorology, Climatology, and Geophysics
Bambang Setyo Prayitno: Agency for Meteorology, Climatology, and Geophysics
Suko Prayitno Adi: Agency for Meteorology, Climatology, and Geophysics
Dwikorita Karnawati: Agency for Meteorology, Climatology, and Geophysics
Lutfi Faizal: Ministry of Public Work and Housing
Ruben Damanik: Multivision Tower

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2023, vol. 116, issue 1, No 55, 1315-1328

Abstract: Abstract High seismicity rates in and around West Java and Sumatra occur as a result of the Indo-Australian plate converging with and subducting beneath the Sunda plate. Large megathrust events associated with this process likely pose a major earthquake and tsunami hazard to the surrounding community, but further effort is required to help understand both the likelihood and frequency of such events. With this in mind, we exploit catalog seismic data sourced from the Agency for Meteorology, Climatology, and Geophysics (BMKG) of Indonesia and the International Seismological Centre (ISC) for the period April 2009 through to July 2020, in order to conduct earthquake hypocenter relocation using a teleseismic double-difference method. Our results reveal a large seismic gap to the south of West Java and southeast Sumatra, which is in agreement with a previous GPS study that finds the region to be a potential future source of megathrust earthquakes. To investigate this further, tsunami modeling was conducted in the region for two scenarios based on the estimated seismicity gaps and the existence of a backthrust fault. We show that the maximum tsunami height could be up to 34 m along the west coast of southernmost Sumatra and along the south coast of Java near the Ujung Kulon Peninsula. This estimate is comparable with the maximum tsunami height predicted by a previous study of southern Java in which earthquake sources were derived from the inversion of GPS data. However, the present study extends the analysis to southeast Sumatra and demonstrates that estimating rupture from seismic gaps can lead to reliable tsunami hazard assessment in the absence of GPS data.

Keywords: Earthquake; Tsunami; Megathrust; West Java; Southeast Sumatra (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1007/s11069-022-05696-y

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