Frictional Afterslip Following the 2005 Nias-Simeulue Earthquake, Sumatra

Author:

Hsu Ya-Ju123,Simons Mark123,Avouac Jean-Philippe123,Galetzka John123,Sieh Kerry123,Chlieh Mohamed123,Natawidjaja Danny123,Prawirodirdjo Linette123,Bock Yehuda123

Affiliation:

1. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.

2. Research Center for Geotechnology, Indonesian Institute of Sciences, Bandung 40135, Indonesia.

3. Institute of Geophysics and Planetary Physics, University of California, San Diego, La Jolla, CA 92093, USA.

Abstract

Continuously recording Global Positioning System stations near the 28 March 2005 rupture of the Sunda megathrust [moment magnitude ( M w ) 8.7] show that the earthquake triggered aseismic frictional afterslip on the subduction megathrust, with a major fraction of this slip in the up-dip direction from the main rupture. Eleven months after the main shock, afterslip continues at rates several times the average interseismic rate, resulting in deformation equivalent to at least a M w 8.2 earthquake. In general, along-strike variations in frictional behavior appear to persist over multiple earthquake cycles. Aftershocks cluster along the boundary between the region of coseismic slip and the up-dip creeping zone. We observe that the cumulative number of aftershocks increases linearly with postseismic displacements; this finding suggests that the temporal evolution of aftershocks is governed by afterslip.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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