Frictional afterslip following the 2005 Nias-Simeulue earthquake, Sumatra.
نویسندگان
چکیده
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.
منابع مشابه
Supporting Online Material for Frictional Afterslip Following the 2005 Nias-Simeulue Earthquake, Sumatra
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ورودعنوان ژورنال:
- Science
دوره 312 5782 شماره
صفحات -
تاریخ انتشار 2006