| Dynamic simulation of interactions between major earthquakes on the Xianshuihe fault zone |
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| 摘 要： | The authors firstly evaluate the strain accumulation rate of the Xianshuihe fault zone based on earth- quake activity. We calculated the stress and seismic moment accumulation rate for each subsection of the Xianshuihe fault zone based on the distribution of geological slip rate and GPS survey results. According to the results, we get the recurrence intervals of characterized earthquakes on each sub- section respectively. A three-dimensional finite element model for western Sichuan is constructed to discuss the earthquakes triggering among major earthquakes (M>6.7) that occurred along the Xianshuihe fault zone since 1893. The calculated Coulomb failure stress changes (ΔCFS) show that 5 of the 6 earthquakes with Ms>6.7 were triggered by positive ΔCFS. The interactions between major earthquakes not only influence recurrence intervals of characterized earthquakes on each subsection, but also change recurrence behavior of major earthquakes along the whole fault zone.
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Dynamic simulation of interactions between major earthquakes on the Xianshuihe fault zone |
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| Authors: | Hui Wang Jie Liu YaoLin Shi Huai Zhang and GuoMin Zhang |
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| Institution: | (1) Institute of Earthquake Science, China Earthquake Administration, Beijing, 100036, China;(2) Laboratory of Computational Geodynamics, Graduate University of Chinese Academy of Sciences, Beijing, 100049, China;(3) China Earthquake Network Center, China Earthquake Administration, Beijing, 100045, China |
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| Abstract: | The authors firstly evaluate the strain accumulation rate of the Xianshuihe fault zone based on earthquake activity. We calculated
the stress and seismic moment accumulation rate for each subsection of the Xianshuihe fault zone based on the distribution
of geological slip rate and GPS survey results. According to the results, we get the recurrence intervals of characterized
earthquakes on each subsection respectively. A three-dimensional finite element model for western Sichuan is constructed to
discuss the earthquakes triggering among major earthquakes ({ntM}>6.7) that occurred along the Xianshuihe fault zone since
1893. The calculated Coulomb failure stress changes (?CFS) show that 5 of the 6 earthquakes with Ms>6.7 were triggered by positive ?CFS. The interactions between major earthquakes not only influence recurrence intervals of
characterized earthquakes on each subsection, but also change recurrence behavior of major earthquakes along the whole fault
zone.
Supported by the Ministry of Science and Technology of China (Grant No. 2004CB418406), and the “Basic Science Research Plan”
of the Institute of Earthquake Science, China Earthquake Administration (Grant No. 2007-03) |
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| Keywords: | Xianshuihe fault zone strain accumulation and releasing recurrence interval finite element method Coulomb failure stress changes |
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