Introduction
Bimonthly, started in 1957
Administrator
Shanxi Provincial Education Department
Sponsor
Taiyuan University of Technology
Publisher
Ed. Office of Journal of TYUT
Editor-in-Chief
SUN Hongbin
ISSN: 1007-9432
CN: 14-1220/N
Administrator
Shanxi Provincial Education Department
Sponsor
Taiyuan University of Technology
Publisher
Ed. Office of Journal of TYUT
Editor-in-Chief
SUN Hongbin
ISSN: 1007-9432
CN: 14-1220/N
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The Moment Tensor Inversion of Yuanping M L4.7Earthquake in Shanxi Province
DOI:
10.16355/j.cnki.issn1007-9432tyut.2019.05.009
Received:
Accepted:
abstract:
According to the China Earthquake Networks Center(CENC),an earthquake with M L=4.7 occurred in Yuanping,Shanxi Province on April 7,2016.It is important to determine the focal mechanism for further understanding the seismicity and generation mechanism of moderate-strong earthquakes of this region.Based on the digital seismic data recorded on the Shanxi Seismic Network and the precise location of the seismic sequence by Hypo2000 method,we investigated the best double-couple focal mechanism for this event.The seismic moment tensor was determined with uncertainty estimation.To verify the reliability of obtained parameters,the inversion results are then compared with the distribution of P wave polarity of vertical components of different stations on the source sphere,and compared with the focal mechanism solutions obtained by Snoke method and CAP method.The results show that the node surfaceⅠparameters of the best double-couple focal mechanism solution is strike 143°,dip 63°,rake-66°;nodeⅡstrike 278°,dip 36°,rake-128°.It is characterized by double couple model as a normal faulting with right-lateral strike-slip component and the optimal focal depth is 11~14 km.The azimuth and plunge of the principal compressive stress P axis are 94°and 64°,respectively.The azimuth and plunge of the principal tensile stress T axis are 216°and 15°,respectively.The scalar seismic moment is M 0=2.492 64×10^15 N·m and the moment magnitude,M W,is consistent with the surface-wave magnitude,M S.
Keywords:
focal mechanism solution;moment tensor inversion;earthquake relocation;Shanxi seismic belt;Yuanping of Shanxi province