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Deformation and Slip Along the Sunda Megathrust in the Great 2005 Nias-Simeulue Earthquake

Briggs, Richard W. and Sieh, Kerry and Meltzner, Aron J. and Natawidjaja, Danny and Galetzka, John and Suwargadi, Bambang and Hsu, Ya-Ju and Simons, Mark and Hananto, Nugroho and Suprihanto, Imam and Prayudi, Dudi and Avouac, Jean-Philippe and Prawirodirdjo, Linette and Bock, Yehuda (2006) Deformation and Slip Along the Sunda Megathrust in the Great 2005 Nias-Simeulue Earthquake. Science, 311 (5769). pp. 1897-1901. ISSN 0036-8075.

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Seismic rupture produced spectacular tectonic deformation above a 400-kilometer strip of the Sunda megathrust, offshore northern Sumatra, in March 2005. Measurements from coral microatolls and Global Positioning System stations reveal trench-parallel belts of uplift up to 3 meters high on the outer-arc islands above the rupture and a 1-meter-deep subsidence trough farther from the trench. Surface deformation reflects more than 11 meters of fault slip under the islands and a pronounced lessening of slip trenchward. A saddle in megathrust slip separates the northwestern edge of the 2005 rupture from the great 2004 Sumatra-Andaman rupture. The southeastern edge abuts a predominantly aseismic section of the megathrust near the equator.

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Additional Information:© 2006 American Association for the Advancement of Science. Received 14 November 2005; accepted 20 January 2006. This research was supported by the NSF, the Gordon and Betty Moore Foundation, and the Indonesian International Joint Research Program (RUTI). The National Geographic Channel and The Discovery Channel provided partial helicopter support. The captains and crews of Derazona Helicopters, the Mentawai Indah, the Saraina, and the Sariman Jadi provided expert transportation in the air and on the sea. Thanks to M. Chlieh, M. Tobita, and M. Meiner for helpful discussions and to J. Giberson and S. Healy for assistance with spatial data. Finally, we thank the people in the earthquake-affected region for their hospitality and willingness to share their observations. This is Caltech Tectonics Observatory contribution number 29.
Group:Caltech Tectonics Observatory, Caltech Tectonics Observatory. Sumatran Plate Boundary, Seismological Laboratory
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Gordon and Betty Moore FoundationUNSPECIFIED
Indonesian International Joint Research Program (RUTI)UNSPECIFIED
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Caltech Tectonics Observatory29
Record Number:CaltechAUTHORS:20101117-090803275
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20845
Deposited By: Tony Diaz
Deposited On:17 Nov 2010 18:36
Last Modified:11 Jun 2015 13:57

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