Partial rupture of a locked patch of the Sumatra megathrust during the 2007 earthquake sequence

A. Ozgun Konca, Jean-Philippe Avouac (), Anthony Sladen, Aron J. Meltzner, Kerry Sieh, Peng Fang, Zhenhong Li, John Galetzka, Jeff Genrich, Mohamed Chlieh, Danny H. Natawidjaja, Yehuda Bock, Eric J. Fielding, Chen Ji and Don V. Helmberger
Additional contact information
A. Ozgun Konca: Tectonics Observatory, California Institute of Technology, Pasadena, California 91125, USA
Jean-Philippe Avouac: Tectonics Observatory, California Institute of Technology, Pasadena, California 91125, USA
Anthony Sladen: Tectonics Observatory, California Institute of Technology, Pasadena, California 91125, USA
Aron J. Meltzner: Tectonics Observatory, California Institute of Technology, Pasadena, California 91125, USA
Kerry Sieh: Tectonics Observatory, California Institute of Technology, Pasadena, California 91125, USA
Peng Fang: Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093, USA
Zhenhong Li: COMET, University of Glasgow
John Galetzka: Tectonics Observatory, California Institute of Technology, Pasadena, California 91125, USA
Jeff Genrich: Tectonics Observatory, California Institute of Technology, Pasadena, California 91125, USA
Mohamed Chlieh: Geosciences Azur, Université de Nice Sophia-Antipolis, Institut de Recherche pour le Développement, Observatoire de la Cote d’Azurrue, 06560 Valbonne, France
Danny H. Natawidjaja: Tectonics Observatory, California Institute of Technology, Pasadena, California 91125, USA
Yehuda Bock: Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093, USA
Eric J. Fielding: Jet Propulsion Laboratory, M.S. 300-233, California Institute of Technology, Pasadena, California 91109, USA
Chen Ji: University of California, Santa Barbara, California 94106
Don V. Helmberger: Tectonics Observatory, California Institute of Technology, Pasadena, California 91125, USA

Nature, 2008, vol. 456, issue 7222, 631-635

Abstract: Seismic stress at Mentawai In March 2005, just south of the rupture area of the 2004 great Sumatra-Andaman earthquake, the magnitude 8.6 Sunda megathrust earthquake occurred. Concern then focused further south on the Mentawai area, where large earthquakes had occurred in 1797 and 1833. A magnitude 8.4 and, twelve hours later, a magnitude 7.9 earthquake did indeed occur in September 2007. Konca et al. now show that the 2007 seismic crisis released only a fraction of the elastic strain that had accumulated since the events of 1797 and 1833, with the same portion of the megathrust rupturing in different patterns depending on local factors. The potential for a large megathrust event in the Mentawai area is therefore still high.

Date: 2008
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DOI: 10.1038/nature07572

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