白鹤滩水库库区地震本底活动特征

Abstract

Abstract: Baihetan Reservoir is located in the downstream of the Jinsha River, which is a high intensity area with complex seismic structure and strong seismic background. Based on the national seismological catalogue and Qiaojia Array seismic data, the characteristics of seismic background activities in the reservoir area are analyzed and discussed, which can give advise for monitoring induced seismicity after impoundment. The study of historical and present seismicity shows that the main seismicity occurred in the Zhaotong-Ludian Fault and the northern section of the Xiaojiang Fault in the study area, and the b value of the whole is 0.966. The spatial distribution of the seismic activity parameters a, b, M_c and R shows that the seismicity of Qiaojia and Ningnan County near the Baihetan Reservoir area is strong, and small earthquakes near the Yudong Reservoir are frequent. The results of Double-difference earthquake location algorithm show that there are less earthquakes in the two regions on both sides of the reservoir area, and the background earthquake distribution in the Baihetan reservoir area shows the phenomenon that the north is more than the south, and the north is deeper than the south.

Key words: Background seismicity, Seismic activity parameters, Double-difference location algorithm, The Baihetan reservoir

CLC Number:

P315.7

LI Chun-Hong, ZHAO Cui-Ping, ZHANG Na, ZHOU Lian-Qing. Seismic Background Characteristics in the Baihetan Reservoir Area[J]. EARTHQUAKE, 2018, 38(4): 94-108.

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Seismic Background Characteristics in the Baihetan Reservoir Area

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