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Xie Mengyu, Shi Baoping, Lin Luchun. 2018: Aftershock rate decay induced by postseismic creep: A case study from the MW7.9 Wenchuan earthquake sequence. Acta Seismologica Sinica, 40(3): 316-331. DOI: 10.11939/jass.20170124
Citation: Xie Mengyu, Shi Baoping, Lin Luchun. 2018: Aftershock rate decay induced by postseismic creep: A case study from the MW7.9 Wenchuan earthquake sequence. Acta Seismologica Sinica, 40(3): 316-331. DOI: 10.11939/jass.20170124
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Aftershock rate decay induced by postseismic creep: A case study from the MW7.9 Wenchuan earthquake sequence

  • College of Earth and Planetary Sciences，University of Chinese Academy of Sciences，Beijing 100049，China

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  • Received Date: May 31, 2017
  • Revised Date: October 16, 2017
  • Available Online: April 25, 2018
  • Published Date: April 30, 2018
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    • Abstract
  • Based on the Dieterich seismicity theory, this study derived a general formula used to calculate decay rate and cumulative frequency of aftershocks following a mainshock, of which the shear stress variation in the fault plane follows the Jeffreys-Lomnitz creep law and is directly related to the modified Omori law. The p value in the modified Omori law is positively correlated with post earthquake loading and unloading process of the transient stress. Combined with the postseismic slip model proposed by Rubin and Ampuero, this study obtained approximate formulas to describe the variation of seismicity and to fit aftershock sequence following the 2008 MW7.9 Wenchuan earthquake. The results show that the p value is directly associated with the ratio of b/a, where a and b are the frictional parameters used in rate- and state-dependent friction, and the c value used in the modified Omori law is associated with Dc, a critical creep distance described by rate- and state-dependent friction. For the MW7.9 Wenchuan earthquake sequence, the fitting results indicate the ratio of b/a and Dc are about 1.13 and 2 to 3 cm, respectively. It needs to be emphasized that postseismic creep proposed by Rubin and Ampuero is an inherent stage during earthquake cycle, which describes characteristics of the transient velocity change in seismogenic zone after the mainshock.
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