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P-wave velocity structure beneath reservoirs and surrounding areas in the lower jinsha river

Earthquake Science 2023年第1期36卷 64-75页

作者： Changzai Wang Jianping Wu Lihua Fang Yaning Liu Jing Liu Yan Cai Poren Li Institute of Geophysics China Earthquake AdministrationBeijing 100081China

The lower reaches of the jinsha river are rich in hydropower resources because of the high mountains,deep valleys,and swift currents in this *** region also features complex tectonic structures and frequent *** the impoundment of the reservoirs,seismic activity increased ***,it is necessary to study the P-wave velocity structure and earthquake locations in the lower reaches of the jinsha river and surrounds,thus providing seismological support for subsequent earthquake prevention and disaster reduction work in reservoir *** this study,we selected the data of 7.670 seismic events recorded by the seismic networks in ***,and Chongqing and the temporary seismic arrays deployed *** then applied the double-difference tomography method to this data,to obtain the P-wave velocity structure and earthquake locations in the lower reaches of the jinsha river and *** results showed that the jinsha river basin has a complex lateral P-wave velocity *** events are mainly distributed in the transition zones between high-and low-velocity anomalies,and seismic events are particularly intense in the Xiluodu and Baihetan reservoir *** cross-sections through the Xiangjiaba and Xiluodu reservoir areas revealed an apparent high-velocity anomaly at approximately 6 km depth:this high-velocity anomaly plays a role in stress accumulation,with few earthquakes distributed inside the high-velocity *** the impoundment of the Baihetan reservoir,the number of earthquakes in the reservoir area increased *** seismic events in the reservoir area north of 27°N were related to the enhanced activity of nearby faults after impoundment:the earthquakes in the reservoir area south of 27°N were probably induced by additional loads(or regional stress changes),and the multiple microseismic events may have been caused by rock rupture near the main faults under high pore pressure.

关键词： double-different tomography downstream of the jinsha river earthquake location P-wave velocity structure reservoir earthquakes

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