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Slip distribution of the 2007 Bengkulu earthquake inferred from tsunami waveforms and InSAR data

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Title: Slip distribution of the 2007 Bengkulu earthquake inferred from tsunami waveforms and InSAR data
Authors: Gusman, A. R. Browse this author
Tanioka, Y. Browse this author
Kobayashi, T. Browse this author
Latief, H. Browse this author
Pandoe, W. Browse this author
Issue Date: 16-Dec-2010
Publisher: American Geophysical Union
Journal Title: Journal of Geophysical Research, Solid Earth
Volume: 115
Start Page: B12316
Publisher DOI: 10.1029/2010JB007565
Abstract: Joint inversion study using tsunami waveforms and InSAR data provides a new way to understand the magnitude and spatial extent of subduction zone earthquakes. A great earthquake (Mw 8.5) occurred on 12 September 2007 off the west coast of Bengkulu, Indonesia. The tsunami generated by the event was recorded by tide gauge stations around the Indian Ocean and by two bottom-pressure sensors in the deep sea. The ground surface displacements produced by the earthquake on Pagai Islands and on Sumatra Island were observed by Interferometric Synthetic Aperture Radar (InSAR). We estimated the slip distribution of the earthquake by joint inversion incorporating a spatial smoothness constraint, using tsunami waveforms and InSAR data. The total released seismic moment calculated from the slip distribution is 6.7 x 10^[21] N m (Mw 8.5), consistent with the seismic moment of the Global CMT solution, 6.71 x 10^[21] N m. The maximum observed tsunami heights along the coast of Bengkulu agree with those computed from the slip distribution. The slip amount of the 2007 earthquake is smaller than the amount of potential slip that has been accumulated since after the 1797 and 1833 events. The premise is that, averaged over long periods of time, the entire fault must slip equal amounts. Therefore the 2007 great earthquake could be followed by several great earthquakes that will rupture the plate interface until the potential slip that has been accumulated is completely released.
Rights: Copyright 2010 by the American Geophysical Union
Type: article
URI: http://hdl.handle.net/2115/45768
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Gusman, A. R.

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