Waveform inversion and analysis of an unusual earthquake swarm in the Boshan mining area, Shandong Province, China

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 m...

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Bibliographic Details
Published in:Earthquake science 2016-02, Vol.29 (1), p.1-15
Main Authors: Zheng, Jian-Chang, Zhao, Jin-Hua, Xu, Chang-Peng, Wang, Peng
Format: Article
Language:English
Subjects:
Analysis
China
Earth and Environmental Science
Earth Sciences
Earthquakes
Geological faults
Geophysics/Geodesy
Mathematical analysis
Mining
Mountains
Plate tectonics
Research Paper
Seismic activity
Shear
Tectonics
Tensile strength
地震群
山东省
异常
构造特征
波形反演
矩张量解
矿区
震源机制
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Summary: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.
ISSN:1674-4519
1867-8777
DOI:10.1007/s11589-016-0145-4