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Acta Seismologica Sinica

, Volume 16, Issue 2, pp 156–165 | Cite as

Earthquake triggering and delaying caused by fault interaction on Xianshuihe fault belt, southwestern China

  • Zhang Qiu-wen 
  • Zhang Pei-zhen 
  • Wang Cheng 
  • Wang Yi-peng 
  • Michael A Ellis
Article

Abstract

The coseismic Coulomb stress change caused by fault interaction and its influences on the triggering and delaying of earthquake are briefly discussed. The Xianshuihe fault belt consists of Luhuo, Daofu, Kangding, Qianning and Ganzi fault. Luohuo (M S=7.6, 1973)-Kangding (M S=6.2, 1975)-Daofu (M S=6.9, 1981)-Ganzi (M S=6.0, 1982) earthquake is a seismic sequence continuous on the time axis with magnitude greater than 6.0. They occurred on the Luhuo, Kangding, Daofu and Ganzi fault, respectively. The coseismic Coulomb stress changes caused by each earthquake on its surrounding major faults and microcracks are calculated, and their effects on the triggering and delaying of the next earthquake and aftershocks are analyzed. It is shown that each earthquake of the sequence occurred on the fault segment with coseismic Coulomb stress increases caused by its predecessors, and most aftershocks are distributed along the microcracks with relatively larger coseismic Coulomb stress increases resulted from the main shock. With the fault interaction considered, the seismic potential of each segment along Xianshuihe fault belt is reassessed, and contrasted with those predicted results ignoring coseismic Coulomb stress change, the significance of fault interaction and its effect on triggering and delaying of earthquake are emphasized. It is concluded that fault interaction plays a very important role on seismic potential of Xianshuihe fault belt, and the maximal change of future earthquake probability on fault segment is up to 30.5%.

Key words

coseismic Coulomb stress change fault interaction earthquake triggering and delaying seismic potential assessment Xianshuihe fault belt 

CLC number

P315.2 

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Copyright information

© Acta Seismologica Sinica 2003

Authors and Affiliations

  • Zhang Qiu-wen 
    • 1
  • Zhang Pei-zhen 
    • 2
  • Wang Cheng 
    • 1
  • Wang Yi-peng 
    • 2
  • Michael A Ellis
    • 3
  1. 1.Huazhong University of Science and TechnologyWuhanChina
  2. 2.Institute of GeologyChina Seismological BureauBeijingChina
  3. 3.University of MemphisMemphisUSA

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