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Xie Mengyu, Shi Baoping. 2018: Discussion on the largest aftershock of the Wenchuan aftershock sequence. Acta Seismologica Sinica, 40(3): 304-315. DOI: 10.11939/jass.20170209
Citation: Xie Mengyu, Shi Baoping. 2018: Discussion on the largest aftershock of the Wenchuan aftershock sequence. Acta Seismologica Sinica, 40(3): 304-315. DOI: 10.11939/jass.20170209
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Discussion on the largest aftershock of the Wenchuan aftershock sequence

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

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  • Received Date: November 29, 2017
  • Revised Date: January 17, 2018
  • Available Online: March 20, 2018
  • Published Date: April 30, 2018
    Graphical Abstract
    • Abstract
  • The 2008 MW7.9 Wenchuan earthquake occurred in Wenchuan, Sichuan Province caused heavy casualties and great economic losses. Using the method proposed by Shcherbakov and Turcotte, we estimate the magnitude of the largest aftershock following the Wenchuan mainshock. The results show that, when aftershock’s magnitude becomes much large, the corresponding aftershocks in the current aftershock catalogue we have used may be missed, which causes the phenomenon that the catalogue deviates from the prediction calculated by the Gutenberg-Richter relationship, and this deviation also causes the big difference between the recorded largest aftershock and inferred largest aftershock. However, using the empirical relationships between the magnitude and surface rupture length or rupture area, we find that the sub-event caused by the Guanxian-Jiangyou fault has a similar magnitude with the inferred largest aftershock. Moreover, based on the model which describes the instability time of fault frictional slip and the Brune’s source model, we demonstrate that the shear seismic wave generated by the earthquake rupture on the Beichuan-Yingxiu fault could trigger the rupture on the Guanxian-Jiangyou fault at a very short time, which finally could lead to an earthquake. Therefore, the triggered event could be considered as one of the largest aftershocks and also be involved in the aftershock’s catalogue.
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    • References (62)
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