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Hsu YJ, Simons M, Avouac JP, et al. Frictional afterslip following the 2005 Nias-Simeulue earthquake, Sumatra. Science. 2006;312(5782):1921-6doi: 10.1126/science.1126960.
Hsu, Y. J., Simons, M., Avouac, J. P., Galetzka, J., Sieh, K., Chlieh, M., Natawidjaja, D., Prawirodirdjo, L., & Bock, Y. (2006). Frictional afterslip following the 2005 Nias-Simeulue earthquake, Sumatra. Science (New York, N.Y.), 312(5782), 1921-6. https://doi.org/10.1126/science.1126960
Hsu, Ya-Ju, et al. "Frictional afterslip following the 2005 Nias-Simeulue earthquake, Sumatra." Science (New York, N.Y.) vol. 312,5782 (2006): 1921-6. doi: https://doi.org/10.1126/science.1126960
Hsu YJ, Simons M, Avouac JP, Galetzka J, Sieh K, Chlieh M, Natawidjaja D, Prawirodirdjo L, Bock Y. Frictional afterslip following the 2005 Nias-Simeulue earthquake, Sumatra. Science. 2006 Jun 30;312(5782):1921-6. doi: 10.1126/science.1126960. PMID: 16809533.
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Science. 2006 Jun 30;312(5782):1921-6. doi: 10.1126/science.1126960.

Frictional afterslip following the 2005 Nias-Simeulue earthquake, Sumatra.

Science (New York, N.Y.)

Ya-Ju Hsu, Mark Simons, Jean-Philippe Avouac, John Galetzka, Kerry Sieh, Mohamed Chlieh, Danny Natawidjaja, Linette Prawirodirdjo, Yehuda Bock

Affiliations

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

PMID: 16809533 DOI: 10.1126/science.1126960

Abstract

Continuously recording Global Positioning System stations near the 28 March 2005 rupture of the Sunda megathrust [moment magnitude (Mw) 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.

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