A possible opak fault segment that caused the 2006 mw 6.3 yogyakarta earthquake and its future implication

Pratama, C. and Widjajanti, N. and Parseno, P. and Pinasti, A. and Ummi, R.F. and Lestari, D. and Sunantyo, T.A. and Heliani, L.S. and Ulinnuha, H. (2021) A possible opak fault segment that caused the 2006 mw 6.3 yogyakarta earthquake and its future implication. In: International Geography Seminar 2019.

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Abstract

On May 26th, 2006, the Mw 6.3 earthquake devastated the Yogyakarta region in a shallow strike-slip mechanism. Previous studies suggest the 2006 Yogyakarta earthquake aligned with the Opak river fault. However, several studies reported the aftershock distribution occurred along the eastward side of the Opak river fault strike. Those discrepancies may indicate two possibilities. First, the Opak river fault has an eastward dipping fault. Second, there are unidentified fault lines rather than Opak river fault. In this study, we investigated the fault segment that was responsible for the 2006 earthquake. We estimated the fault length based on seismic moment release assuming rigidity, fault depth, and coseismic displacement are 30 GPa, 12.5 Km, and 1 m, respectively. Therefore, we investigated the two possible scenarios using multi-years and recent Global Navigation Satellite System (GNSS) network developed by the Department of Geodetic Engineering, Universitas Gadjah Mada. The GNSS observation suggests the 2006 Yogyakarta earthquake occurred on the unidentified fault rather than has an eastward dipping fault. The estimated fault length is only 9.2 Km segment. Hence, the present study implies that other fault segments might not have released the accumulated stress and may become large earthquakes in the future. © Published under licence by IOP Publishing Ltd.

Item Type: Conference or Workshop Item (Paper)
Additional Information: Cited by: 0; Conference name: 3rd International Geography Seminar 2019, IGEOS 2019; Conference date: 31 August 2019; Conference code: 167943; All Open Access, Gold Open Access
Uncontrolled Keywords: Earthquake effects; Global positioning system; Rivers; Accumulated stress; Aftershock distributions; Co-seismic displacement; Fault strike; Global Navigation Satellite Systems; Large earthquakes; Seismic-moment release; Strike-slip mechanism; Faulting
Divisions: Faculty of Engineering > Geodetic Engineering Department
Depositing User: Sri JUNANDI
Date Deposited: 21 Oct 2024 06:45
Last Modified: 21 Oct 2024 06:45
URI: https://ir.lib.ugm.ac.id/id/eprint/5348

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