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EARTHQUAKE ›› 2008, Vol. 28 ›› Issue (1): 40-46.

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Large aftershocks triggering by coulomb failure stress following the 2007 MS8.5 and 8.3 Sumatra great earthquakes

ZHOU Long-quan1, MA Hong-sheng2, XIA Hong3, ZHOU Jun-jie4, SHAO Zhi-gang2   

  1. 1. China Earthquake Networks Center, CEA, Beijing 100045;
    2. Institute of Earthquake Science, CEA, Beijing 100036;
    3. China Search and Rescue Center, CEA, Beijing 100049;
    4. College of Natural Resource, Hebei University of Engineering, Handan 056038, China
  • Received:2007-10-15 Revised:2007-11-10 Online:2008-01-31 Published:2021-10-29

Abstract: A series of large aftershocks with magnitude larger than 6.0 occurred after the Sumatra MS8.5 earthquake (Sep.12, 2007). The change of Coulomb failure stress on aftershock focal depth produced by all the earthquakes before each aftershock is calculated. The results show that the large aftershocks of the 2007 MS8.5 Sumatra earthquake occurred in areas of increscent stress, which is more than 0.01 MPa. Therefore, the aftershocks were probably triggered by the Coulomb failure stress change.

Key words: Sumatra MS8.5 and 8.3 earthquakes, Coulomb failure stress, Stress triggering

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