The 2007 Bengkulu earthquake, its rupture model and implications for seismic hazard

Ambikapathy, A. ; Catherine, J. K. ; Gahalaut, V. K. ; Narsaiah, M. ; Bansal, A. ; Mahesh, P. (2010) The 2007 Bengkulu earthquake, its rupture model and implications for seismic hazard Journal of Earth System Science, 119 (4). pp. 553-560. ISSN 0253-4126

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The 12 September 2007 great Bengkulu earthquake (Mw 8.4) occurred on the west coast of Sumatra about 130 km SW of Bengkulu. The earthquake was followed by two strong aftershocks of Mw 7.9 and 7.0. We estimate coseismic offsets due to the mainshock, derived from near-field Global Positioning System (GPS) measurements from nine continuous SuGAr sites operated by the California Institute of Technology (Caltech) group. Using a forward modelling approach, we estimated slip distribution on the causative rupture of the 2007 Bengkulu earthquake and found two patches of large slip, one located north of the mainshock epicenter and the other, under the Pagai Islands. Both patches of large slip on the rupture occurred under the island belt and shallow water. Thus, despite its great magnitude, this earthquake did not generate a major tsunami. Further, we suggest that the occurrence of great earthquakes in the subduction zone on either side of the Siberut Island region, might have led to the increase in static stress in the region, where the last great earthquake occurred in 1797 and where there is evidence of strain accumulation.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:2007 Bengkulu Earthquake; GPS Measurements; Coseismic Displacement; Slip Model Tsunami
ID Code:113246
Deposited On:07 Jun 2018 09:38
Last Modified:07 Jun 2018 09:38

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