Deformation and slip along the Sunda megathrust in the great 2005 Nias-Simeulue earthquake

Richard W. Briggs, Kerry Sieh, Aron J. Meltzner, Danny Natawidjaja, John Galetzka, Bambang Suwargadi, Ya Ju Hsu, Mark Simons, Nugroho Hananto, Imam Suprihanto, Dudi Prayudi, Jean Philippe Avouac, Linette Prawirodirdjo, Yehuda Bock

Research output: Contribution to journalArticlepeer-review

266 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1897-1901
Number of pages5
Issue number5769
Publication statusPublished (in print/issue) - 31 Mar 2006


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