长江三峡工程库区地震活动性规律  

The Seismic Activity Regular on the Reservoir Region of Three Gorges Project

作　　者：王明振[1,2] 李珊 高霖[1,2] WANG Ming-Zhen;LI Shan;GAO Lin(College of Civil Engineering,Chongqing University of Arts and Sciences,Chongqing 402160,China;Civil Engineering Disaster Prevention and Mitigation Institute,Chongqing University of Arts and Sciences,Chongqing 402160,China)

机构地区：[1]重庆文理学院土木工程学院,重庆402160 [2]重庆文理学院土木工程防灾减灾研究所,重庆402160

出　　处：《科学技术与工程》2020年第19期7865-7869,共5页Science Technology and Engineering

基　　金：重庆市自然科学基金(基础研究与前沿探索专项)面上项目(cstc2019jcyj-msxmX0739);教育部人文社会科学研究一般项目(19XJCZH005);中国地震局工程力学研究所基本科研业务费专项(2019D13)。

摘　　要：长江三峡工程库区自运行以来微震活动性相对较为频繁,对库区范围内地质灾害的防治具有不利影响。基于库区多年地震监测数据,统计分析了库区地震发生情况,并采用概率地震危险性方法对库区地震震级-频度关系模型、库区震级分布概率、库区地震发生次数概率等地震活动性规律问题进行了研究。研究结果表明,库区地震震级以微震及极微震为主,且地震类型以构造"触发型"水库地震为主。当采用泊松分布时,震级变化对地震发生次数概率计算的准确性具有一定的影响。可为库区进行地震危险性分析和防震减灾工作提供指导和参考。The micro-seismic activity is relatively more frequent in the reservoir region of the Three Gorges project since the operation, which has an adverse impact on the prevention and control of geological hazards. Based on the earthquake monitoring data of the reservoir region for many years, the earthquake situation was statistically analyzed. And the probabilistic seismic hazard analysis method was used to research seismic activity regular issues such as the earthquake magnitude-frequency relationship model, the probability distribution of earthquake magnitude, and the probability distribution of earthquake activity numbers in the reservoir region. The results show that the earthquake magnitudes of the reservoir are mainly small magnitude or extremely small magnitude, and the type of earthquake is mainly construct-triggered earthquake. When using the Poisson distribution, the change of magnitude has certain influence on the calculating accuracy of the probability for earthquakes’ frequency. The research can provide guidance and reference for seismic hazard analysis and earthquake disaster reduction work for the reservoir region.

关 键 词：长江三峡 水库 地震 地震活动性 泊松分布 

分 类 号：TV62.6[水利工程—水利水电工程]