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Relocation of the Foreshocks and Aftershocks of the 2021 Ms 6.4 Yangbi Earthquake Sequence,Yunnan,China

Journal of Earth Science 2022年第4期33卷 892-900页

作者： Ting Yang Boren Li Lihua Fang Youjin Su Yusheng Zhong Jingqiong Yang Min Qin Yaji Xu Institute of Geophysics China Earthquake AdministrationBeijing 100081China Key Laboratory of Earthquake Source Physics China Earthquake AdministrationBeijing 100081China Institute of Disaster Prevention Sanhe 065201China Yunnan Earthquake Agency Kunming 650224China

An Ms 6.4 earthquake occurred in Yangbi,Yunnan,China on May 21,2021,which has obvious foreshock activity and abundant *** on the seismic observation data recorded by the Yunnan Seismic Network three days before and seven days after the mainshock,a doubledifference location method was used to relocate 2133 earthquakes of the Yangbi *** are mostly distributed to the southeast of the mainshock in a unilateral rupture *** sequence exhibits a SE-trending linear alignment with a length of about 25 km,and most of the focal depth is above 12 *** with the seismic distribution and focal mechanism results,we infer that the strike of the seismogenic fault is about 140°,and dipping to the *** fault structure revealed by the seismic sequence is complex,with the NW segment exhibiting a steep dip and relatively simple structure of strike-slip rupture and the SE segment consisting of several branching *** Yangbi Earthquake is a typical foreshock-mainshock-aftershock sequence,and the mainshock is likely triggered by the largest *** earthquake occurred in the boundary between high-and lowvelocity anomalous zone,where is susceptible to generate large earthquakes.

关键词： Yangbi Earthquake weixi-qiaohou-weishan fault earthquake sequence double-difference relocation earthquakes

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Three-dimensional velocity structure around the focal area of the 2021 MS6.4 Yangbi earthquake

引用

Earthquake Science 2021年第5期34卷 399-412页

作者： Yunpeng Zhang Weitao Wang Wei Yang Min Liu Jinbo Su Xiaobin Li Jun Yang Institute of Geophysics China Earthquake AdministrationBeijing 100081China Key Laboratory of Earthquake Source Physics China Earthquake AdministrationBeijing 100081China China University of Geosciences(Beijing) Beijing 100083China Urumqi Institute of Central Asian Seismology China Earthquake AdministrationUrumqi 830011China Dali Center China Seismic Experimental SiteDali 671000China

On May 21,2021,an MS6.4 earthquake occurred in Yangbi,Yunnan province,China,which exhibited typical foreshock-mainshock-aftershock *** better understand the velocity structure of the focal area and adjacent fault zones,Pg/Sg travel times at 12 seismic stations for the local earthquakes with ML≥1.5 from 2009-2019 and the Yangbi sequence in May of 2021 were used to invert the three-dimensional(3D)structures for both vP and v_(P)/v_(S).The obtained structure extends deeply to 15 km for area(25°N-26.5°N,99.5°E-101°E)at a horizontal resolution of 10×10 km,and the accuracy of the v_(P) velocity was verified using airgun signals excited by the Binchuan Airgun Transmitting Seismic Station(BATSS).The resulting v_(P) and v^(P)/v_(S) images correlate with existing fault zones and the Yangbi sequence,including:(1)The shallow velocity structure at 0 km agrees with local topography,where the Binchuan basin exhibits low-v_(P) and high-v_(P)/v_(S) *** 3-15 km,v_(P) and v_(P)/v_(S) show variations,and the boundaries are consistent with the main faults(e.g.,the weixi-qiaohou-weishan,Honghe,and Chenghai faults).(2)The largest foreshock(M_(S)5.6),main-shock(MS6.4),and largest aftershock(M_(S)5.2)occurred near the boundaries where both vP and v_(P)/v_(S) have clear contrasts.(3)Small earthquakes are also concentrated in the transition zone between high-and low-vP and v_(P)/v_(S) anomalies,and are biased toward low-v_(P)/v_(S) zones.(4)Boundaries in v_(P) and v_(P)/v_(S) are observed at 20 km west of the weixi-qiaohou-weishan fault,indicating that there may exist one hidden fault.

关键词： MS6.4 Yangbi earthquake Honghe fault weixi-qiaohou-weishan fault body wave tomography air-gun source.

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