Rapid report of the 8 January 2022 M_S6.9 Menyuan earthquake,Qinghai,China
Rapid report of the 8 January 2022 M_S6.9 Menyuan earthquake,Qinghai,China
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2022年1月8日中国青海门源M_S6.9地震快速报告
DOI：
10.1016/j.eqrea.2022.100113
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Zhang Yingying
中科院分区：
文献类型：
--
作者：
Yang Hongfeng;Wang Dun;Guo Rumeng;Xie Mengyu;Zang Yang;Wang Yue;Yao Qiang;Cheng Chuang;An Yanru;Zhang Yingying
The M_S 6.9 Menyuan earthquake in Qinghai Province,west China is the largest earthquake by far in 2022.The earthquake occurs in a tectonically active region,with a background b-value of 0.87 within 100 km of the epicenter that we derived from the unified catalog produced by China Earthquake Networks Center since late 2008.Field surveys have revealed surface ruptures extending 22 km along strike,with a maximum ground displacement of 2.1 m.We construct a finite fault model with constraints from InSAR observations,which showed multiple fault segments during the Menyuan earthquake.The major slip asperity is confined within 10 km at depth,with the maximum slip of 3.5 m.Near real-time back-projection results of coseismic radiation indicate a northwest propagating rupture that lasted for ~10 s.Intensity estimates from the back-projection results show up to a Mercalli scale of IX near the ruptured area,consistent with instrumental measurements and the observations from the field surveys.Aftershock locations (up to January 21,2022) exhibit two segments,extending to ~20 km in depth.The largest one reaches MS 5.3,locating near the eastern end of the aftershock zone.Although the location and the approximate magnitude of the mainshock had been indicated by previous studies based on paleoearthquake records and seismic gap,as well as estimated stressing rate on faults,significant surfacebreaching rupture leads to severe damage of the high-speed railway system,which poses a challenge in accurately assessing earthquake hazards and risks,and thus demands further investigations of the rupture behaviors for crustal earthquakes.
