注水诱发地震序列的震源机制变化特征: 以四川长宁序列为例

朱航; 何畅

doi:10.3799/dqkx.2014.161

Volume 39 Issue 12

Dec. 2014

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Zhu Hang, He Chang, 2014. Focal Mechanism Changing Character of Earthquake Sequence Induced by Water Injection: A Case Study of Changning Sequence, Sichuan Province. Earth Science, 39(12): 1776-1782. doi: 10.3799/dqkx.2014.161

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Zhu Hang, He Chang, 2014. Focal Mechanism Changing Character of Earthquake Sequence Induced by Water Injection: A Case Study of Changning Sequence, Sichuan Province. Earth Science, 39(12): 1776-1782. doi: 10.3799/dqkx.2014.161

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Focal Mechanism Changing Character of Earthquake Sequence Induced by Water Injection: A Case Study of Changning Sequence, Sichuan Province

doi: 10.3799/dqkx.2014.161

Zhu Hang,
He Chang

Sichuan Earthquake Administration, Chengdu 610041, China

Received Date: 2014-02-27
Publish Date: 2014-12-01

Abstract

Abstract

Earthquakes induced by water injection appeared in the border area of Changning, Xingwen and Gongxian counties, Sichuan Province since April, 2006. Up to April 30, 2013, 16 M_L≥4.0 earthquakes occurred and the maximum is M_L=5.2 on April 25, 2013. In this paper, the earthquake focal mechanism changing process of Changning M_L≥3.0 earthquake sequence is studied by calculating correlation coefficient of body wave spectral amplitudes, and the results show that focal mechanisms of sequence events are scattering, furthermore, 12 M_L≥4.0 earthquakes' focal mechanisms are calculated by CAP method and they are in disorder also. The following analyses believe that water injection causes the pore pressure of rock body increasing as well as the friction coefficients of pre-existing fault planes decreasing, and those 2 factors lead to Coulomb stress change Δσ_f increasing, thus induce earthquakes' occurrence. Therefore, the earthquakes induced by water injection occur without obvious enhancement of regional tectonic stress intensity, and there are no obvious restraining effects on the rupture directions of the earthquakes. As a result, the focal mechanisms of those earthquakes appear scattering.
- earthquake induced by water injection,
- earthquake sequence,
- focal mechanism,
- spectral amplitude correlation coefficient,
- earthquake

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References(35)

References

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Focal Mechanism Changing Character of Earthquake Sequence Induced by Water Injection: A Case Study of Changning Sequence, Sichuan Province

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