Implications for megathrust earthquakes and tsunamis from seismic gaps south of Java Indonesia

Widiyantoro, S. and Gunawan, E. and Muhari, A. and Rawlinson, N. and Mori, J. and Hanifa, N. R. and Susilo, S. and Supendi, P. and Shiddiqi, H. A. and Nugraha, A. D. and Putra, H. E. (2020) Implications for megathrust earthquakes and tsunamis from seismic gaps south of Java Indonesia. Scientific Reports, 10 (1). ISSN 2045-2322 DOI https://doi.org/10.1038/s41598-020-72142-z

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Abstract

Relocation of earthquakes recorded by the agency for meteorology, climatology and geophysics (BMKG) in Indonesia and inversions of global positioning system (GPS) data reveal clear seismic gaps to the south of the island of Java. These gaps may be related to potential sources of future megathrust earthquakes in the region. To assess the expected inundation hazard, tsunami modeling was conducted based on several scenarios involving large tsunamigenic earthquakes generated by ruptures along segments of the megathrust south of Java. The worst-case scenario, in which the two megathrust segments spanning Java rupture simultaneously, shows that tsunami heights can reach ~ 20 m and ~ 12 m on the south coast of West and East Java, respectively, with an average maximum height of 4.5 m along the entire south coast of Java. These results support recent calls for a strengthening of the existing Indonesian Tsunami Early Warning System (InaTEWS), especially in Java, the most densely populated island in Indonesia.

Item Type: Article
Uncontrolled Keywords: 2020AREP; IA76
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
07 - Gold Open Access
Journal or Publication Title: Scientific Reports
Volume: 10
Identification Number: https://doi.org/10.1038/s41598-020-72142-z
Depositing User: Sarah Humbert
Date Deposited: 23 Nov 2020 00:05
Last Modified: 23 Nov 2020 00:05
URI: http://eprints.esc.cam.ac.uk/id/eprint/4926

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