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[1]JIANG Jinzhong,FU Hong,LI Tao.Relocation of the 2021 Yangbi,Yunnan MS6.4 Earthquake Sequence and Discussion of Its Seismogenic Fault[J].Journal of Seismological Research,2021,44(03):320-329.

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Relocation of the 2021 Yangbi,Yunnan M_S6.4 Earthquake Sequence and Discussion of Its Seismogenic Fault

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 44 Number of periods: 2021 03 Page number: 320-329 Column: Public date: 2021-10-20

Title:: Relocation of the 2021 Yangbi,Yunnan M_S6.4 Earthquake Sequence and Discussion of Its Seismogenic Fault

Author(s):: JIANG Jinzhong; FU Hong; LI Tao; (Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)

Keywords:: the 2021 Yangbi M_S6.4 earthquake; the double-difference relocation; the cross-correlation analysis; focal mechanism solution; seismogenic fault

CLC:: P315.7

DOI:: -

Abstract:: Using earthquake catalog and seismic waveforms data recorded by the Yunnan Seismic Network,we relocate the Yangbi,Yunnan M_S6.4 earthquake sequence occurring from 18th to 23th May,2021 through the double-difference relocation algorithm and the cross-correlation analysis.We also invert the focal mechanisms and depths of the three M_S≥5.0 events(including the mainshock)in the Yangbi earthquake sequence with the cut-and-paste(CAP)method.Then we obtain epicenters and focal depths of 1 012 events,with median relocation errors about 1.1 km and 3.0 km in horizontal and depth direction,respectively.The focal mechanisms and the depths of each of the three events inverted are slightly different,which could be attributed to the different fault structures between the shallow and the deep part of the seismogenic fault zone,or the stress adjustment or fluid migration after the mainshock.According to the double-difference relocation,CAP inversions and distribution of regional geological structures,we preliminary infer that the Weixi-Qiaohou Fault could be the seismogenic fault of the 2021 Yangbi M_S6.4 earthquake sequence.The parameters of the Fault’s fracture surface,strike/dip/slip,could be 140°/80°/-160°.

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Last Update: 2021-10-20