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The seismogenic structures and migration characteristics of the 2021 Yangbi M6.4 Earthquake sequence in Yunnan,China

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Science China Earth Sciences 2022年第8期65卷 1522-1537页

作者： Kun YAN Weijun WANG Fei PENG Qincai WANG Huadong KOU Aijing YUAN Institute of Geophysics China Earthquake AdministrationBeijing100081China Institute of Earthquake Forecasting China Earthquake AdministrationBeijing100036China

We constructed a more complete earthquake catalog in the 2021 Yangbi M6.4 focal area by re-scanning the continuous waveforms integrated with deep learning and template matching techniques,to explore the seismogenic structures of the Yangbi mainshock and its nucleation *** new catalog has three times the number of earthquakes than the CENC catalog,and the magnitude completeness has dropped from 1.1 to *** distribution of earthquakes indicates a broom-shaped structure consisting of several oblique secondary faults and a strike-slip main fault which strikes to 315°with 80°dipping to *** earthquakes extend along the fault strike about 27 km in width and 2-13 km at depth and have noticeable variations on seismicity in the mainshock’s north and *** with the north,the south has denser and higher magnitude aftershocks and also has a seismic gap probably weakened by the fluid at the depth range of about 5-6 *** foreshocks were mainly active in the 8-kilometer-long fault zone south of the mainshock,which show a steady drop in b-values over time and a migration pattern toward the epicenter of two steep jumps,stagnation,and then acceleration which finally triggered the *** in the north,seldom foreshock occurred,and the aftershocks were delayed triggered 3 hours after the mainshock,and sparsely scattered shallow at depth and small in *** summarize,the northern part of the Yangbi seismogenic fault is thought to be relatively locked,whereas the southern part has a weakening zone and promotes *** nucleation mechanism of the mainshock and its onset at the junction of the locked and pre-slip zones may be a combination of pre-slip and cascade triggering.

关键词： Yangbi earthquake microseismic detection Seismogenic structure Earthquake migration Earthquake nucleation process

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Study on the Physical Process and Seismogenic Mechanism of the Yangbi MS 6.4 Earthquake in Dali,Yunnan Province

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Acta Geologica Sinica(English Edition) 2024年第S01期98卷 22-23页

作者： DUAN Mengqiao ZHAO Cuiping ZHOU Lianqing Institute of Earthquake Forecasting China Earthquake AdministrationBeijing 100036China

The Ms 6.4 earthquake occurred on May 21,2021 in Yangbi County,Dali Prefecture,Yunnan Province,which was the largest earthquake after the 2014 Jinggu Ms 6.6 earthquake,in western *** the earthquake,the rapid field investigation and earthquake relocation reveal that there was no obvious surface rupture and the earthquake did not occur on pre-existing active fault,but on a buried fault on the west side of Weixi–Qiaohou–Weishan fault zone in the eastern boundary of Baoshan *** foreshocks appeared three days before the *** phenomena aroused scholars'intensive *** the physical process and seismogenic mechanism of the Yangbi Ms 6.4 earthquake are revealed by the foreshocks and aftershocks?These scientific questions need to be solved urgently.

关键词： The Yangbi Ms 6.4 earthquake 3D velocity structure microseismic detection b-value source parameters nuleation process seismogenic mechanism

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