三峡库区仙女山和九畹溪断裂带水库地震变化规律  

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

作　　者：王孔伟[1] 路永强 聂进 滕明明 王宵亮 Wang Kongwei;Lu Yongqiang;Nie Jin;Teng Mingming;Wang Xiaoliang(Key Laboratory of Geological Disaster of Three Gorges Reservoir Area of Ministry of Education(China Three Gorges University),Yichang 443002,Hubei,China)

机构地区：[1]三峡库区地质灾害教育部重点实验室(三峡大学),湖北宜昌443002

出　　处：《吉林大学学报（地球科学版）》2021年第2期624-637,共14页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(51439003)。

摘　　要：三峡库区蓄水以来,长江周边出现了大量的水库地震,主要集中于巴东—泄滩—仙女山区域,目前已达上万次,最大震级为5.1级。通过野外地质调查及对已有水库地震数据进行研究,采用构造地质分析方法,对三峡库区仙女山和九畹溪断裂带水库地震空间上的迁移规律、时间上的周期规律以及微地震群的成因机理进行分析。结果表明:从时间上看,水库地震具有周期性,表现为长周期(与库水位相关)和短周期(与库水位快速波动相关);从空间上看,水库地震具有迁移规律,受九畹溪断裂控制的触发型水库地震存在着逐渐向南迁移的特征,受仙女山断裂控制的触发型水库地震局限分布于仙女山断裂北延端点处,分布于仙女山断裂西侧(周坪乡附近)带状分布的水库诱发地震逐渐呈点状向南迁移。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.

关 键 词：水库地震迁移 水库地震周期 仙女山和九畹溪断裂带 三峡库区 

分 类 号：P642.22[天文地球—工程地质学]