长江三峡工程库区地震活动性规律

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

The micro-seismic activity is relatively more frequent in the reservoir region of The Three Gorges project since the operation of the project, which has an adverse impact on the prevention and control of geological hazards. Based on the multi-year earthquake monitoring data of the reservoir region, the earthquake situation is statistical analyzed. And seismic activity regular which contents 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 is researched using the probabilistic seismic hazard analysis method. The results can provide guidance and reference for seismic hazard analysis and earthquake disaster reduction work for the reservoir region.