[1]ZHANG Yan,JIANG Jinzhong,WANG Guangming,et al.Analysis of the Seismicity of Two Types of Earthquake Sequences in Yanjin,Yunnan[J].Journal of Seismological Research,2024,47(02):178-190.[doi:10.20015/j.cnki.ISSN1000-0666.2024.0023 ]
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Analysis of the Seismicity of Two Types of Earthquake Sequences in Yanjin,Yunnan

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 47 Number of periods: 2024 02 Page number: 178-190 Column: Public date: 2023-12-01
Title:
Analysis of the Seismicity of Two Types of Earthquake Sequences in Yanjin,Yunnan
Author(s):
ZHANG Yan1; 2; JIANG Jinzhong1; 2; WANG Guangming1; 2; ZHANG Shuai1; 2; HE Deqiang3; ZHOU Qingyun1; 2
(1.Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)(2.Kunming Institute of Earthquake Prediction,China Earthquake Administration,Kunming 650224,Yunnan,China)(3.Zhaotong Earthquake Preparedness and Disaster Reduction Agency,Zhaotong 657000,Yunnan,China)
Keywords:
the Delingha earthquake;  earthquake relocation;  focal mechanism;  seismic tectonic background;  Qinghai
CLC:
P315.72
DOI:
10.20015/j.cnki.ISSN1000-0666.2024.0023
Abstract:
Based on the catalogue and waveforms of moderate- and small-earthquakes occurring in Yanjin area during September 2020 to January 2021,we use the Match and Locate(M&L)method to detect and locate weak events.A total of 1 340 events are detected by the M&L method,which are about 6.7 times the number of events listed in the Yunnan Seismic Networks Catalogue.We then obtain refined hypocenters of 351 detected earthquakes by simultaneously using P and S travel times and waveform cross-correlation data in the double-difference relocation algorithm.We also investigate the spatial-temporal characteristics of the detected earthquakes after double-difference relocation.Our results indicate that the moderate- and small-earthquakes occurring in Yanjin area during September 2020 to January 2021 could be categorized as two different types earthquake sequences:the ML3.9 swarm mainshock type,and the ML5.2 isolated earthquake.These two types of earthquake sequences occurred along two different faults with different strike and dip angles.The ML3.9 swam sequence occurred on the Yanjin-Junlian fault with a strike of NNW direction and dip angle of about 75°,and the ML5.2 isolated sequence occurred on a blind fault with a strike of near NS direction and a dip angle of about 50°.
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