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

نویسندگان

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

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عنوان ژورنال:
  • Science

دوره 312 5782  شماره 

صفحات  -

تاریخ انتشار 2006