Waveform inversion and analysis of an unusual earthquake swarm in the Boshan mining area,Shandong Province,China |
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Authors: | Jian-Chang Zheng Jin-Hua Zhao Chang-Peng Xu Peng Wang |
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Institution: | Earthquake Administration of Shandong Province, Jinan 250014, China |
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Abstract: | Moment tensor solutions were retrieved for the earthquake swarm that occurred during November and December 2010 in the Boshan mining area, Shandong Province, China. The results showed that the double-couple components in the source mechanisms were higher at the beginning of the swarm and consisted mainly of shear faulting controlled by tectonic stress. The subsequent events had significant non-double-couple components, indicating tensile faulting. The double-couple components predominately presented as normal faulting and the P axes were orientated almost vertically. The slip vectors of the swarm events were relatively stable. With reference to the tectonic features near the epicenter, we concluded that the swarm was a result of subordinate fault motion related to the Wangmu Mountain fault and that high-pressure pore fluids played a crucial role in the activity of the earthquake swarm. |
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Keywords: | Moment tensor Tensile crack Mechanism Boshan earthquake swarm Pore pressure |
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