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Three-dimensional crustal P-wave velocity structure in the Yangbi and Eryuan earthquake regions, Yunnan, China

Earthquake Science 2021年第4期34卷 358-366页

作者： Jia Jia Qingju Wu Fuyun Wang Geophysical Exploration Center China Earthquake AdministrationZhengzhou 450002China Institute of Geophysics China Earthquake AdministrationBeijing 100081China

A magnitude 5.5 earthquakes occurred in Eryuan County,Dali Bai Autonomous Prefecture,Yunnan Province,China,on March *** a magnitude 5.0 earthquake occurred in the same place on April 17,2013,i.e.,45 days ***,on May 21,2021,multiple earthquakes,one with magnitude 6.4 and several at 5.0 or above,occurred in Yangbi County,Dali Bai Autonomous Prefecture,Yunnan Province,*** of these occurred in the weixi-qiaohouweishan fault.*** this study,1,874 seismic events in Yangbi and Eryuan counties were identified by automatic micro-seismic identification technology and the first arrivals were picked up *** this,a total of 11,968 direct P-wave absolute arrivals and 73,987 high-quality Pwave relative arrivals were collected for joint inversion via the double difference tomography *** was done to obtain the regional three-dimensional fine crustal P-wave velocity *** results show that the travel time residuals before and after inversion decreased from the initial–0.1–0.1 s to–0.06–0.06 *** upper crust in the study area,which exhibited a low-velocity anomaly,corresponded to the basin region;this indicated that the low-velocity anomaly in the shallow part of the study area was affected by the *** also showed some correlation between the distribution of the earthquakes and velocity structure,as there was a lowvelocity body Lv1 with a wide distribution at depths ranging from 15–20 km in the Yangbi and Eryuan earthquake *** addition,earthquakes occurred predominantly in the highlow velocity abnormal transition *** low-velocity body in the middle and lower crust may be prone to concentrating upper crustal stress,thus leading to the occurrence of earthquakes.

关键词： Yangbi and Eryuan earthquakes double difference tomography three-dimensional P-wave velocity structure weixi-qiaohou-weishan fault.

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