向家坝水库蓄水前库区天然地震本底特征  

Analysis of Natural Seismic Background Characteristics of Xiangjiaba Reservoir

作　　者：雷红富[1] 苏立[1] 

机构地区：[1]中国长江三峡集团公司,四川成都610042

出　　处：《水电能源科学》2015年第12期105-109,共5页Water Resources and Power

摘　　要：研究水电站工程所在区域及水库影响区天然地震背景水平，不仅可对水库诱发性地震的危险性进行前期评价，而且可为蓄水后的诱发地震活动监测提供可靠的鉴别依据。通过分析向家坝水电工程所在的区域地震背景、构造特征、应力场及中强震震源机制特点，并结合相关地震监测数据和向家坝水库地震监测台网的地震监测数据，探讨了向家坝水库影响区及周边区域范围天然地震年频次、月频次、地震震级一频度关系及震源机制特征，可为向家坝水库蓄水后库区水库地震监测、预测及地震类型判识提供参考。Studying the background levels of natural earthquake in reservoir regional, not only can evaluate the seismic dangerous induced by reservoir in early period, but also can provide a basis for the identification of the reservoir seismicity after reservoir impounded. This paper analyzes the area seismic background, structural characteristics, tectonic stress field and earthquake focal mechanisms of Xiangjiaba hydropower project. Combined the relevant seismic monitoring data and Xiangjiaba reservoir earthquake monitoring network, the yearly frequency and monthly frequency of seismic characteristics, the relationship magnitude-frequency of earthquake and focal mechanism in the influence range of Xiangjiaba reservoir area are discussed. It provides basis for the earthquake monitoring, prediction and identification of the reservoir earthquake type in Xiangjiaba reservoir after impounded.

关 键 词：向家坝水库 天然地震本底 构造应力场 水库地震监测台网 

分 类 号：TV697.24[水利工程—水利水电工程]