A Possible Opak Fault Segment that Caused the 2006 Mw 6.3 Yogyakarta Earthquake and its Future Implication
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 o...
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Main Authors: | , , , , , , , , |
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Format: | Conference or Workshop Item PeerReviewed |
Language: | English |
Published: |
2019
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Subjects: | |
Online Access: | https://repository.ugm.ac.id/276029/1/_SI2.pdf https://repository.ugm.ac.id/276029/ |
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Institution: | Universitas Gadjah Mada |
Language: | English |
Summary: | 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. |
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