三峡库区仙女山和九畹溪断裂带水库地震变化规律

doi:10.13278/j.cnki.jjuese.20200033

Abstract

Abstract: Since the impoundment of the Three Gorges Reservoir, a large number of reservoir earthquakes have occurred around the Yangtze River, mainly in the area of Badong-Xietan-Xiannüshan. So far, they have reached tens of thousands of times, with the maximum magnitude of 5.1. Through the field geological survey of the Xiannüshan and Jiuwanxi fault zones and the existing seismic data of the reservoir, a tectonic geological method is adopted to analyze the law of migration, the periodicity of time, and the genetic mechanism of the micro-seismic groups. It is concluded that from the time point of view, the reservoir earthquake has periodicity of long period (related to reservoir water level) and short period (related to rapid fluctuation of reservoir water level). From the space point of view, the reservoir earthquakes have a certain migration law:The reservoir earthquakes triggered by the Jiuwanxi fault have the characteristics of gradual migration to the south; The reservoir earthquakes triggered by the Xiannüshan fault are limited to the northward extension of the Xiannüshan fault; the banded earthquakes induced by reservoirs on the west side of the Xiannüshan fault (near Zhouping Township) have the trend of gradual migration to the south.

Key words: reservoir earthquake transfer law, reservoir earthquake cycle, Xiannüshan and Jiuwanxi fault zones, the Three Gorges Reservoir area

CLC Number:

P642.22

Wang Kongwei, Lu Yongqiang, Nie Jin, Teng Mingming, Wang Xiaoliang. Earthquake Variation Law of Xiannüshan and Jiuwanxi Fault Zones in Three Gorges Reservoir Area[J].Journal of Jilin University(Earth Science Edition), 2021, 51(2): 624-637.

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Earthquake Variation Law of Xiannüshan and Jiuwanxi Fault Zones in Three Gorges Reservoir Area

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