水库水位变化对地震活动和变形的影响  

INFLUENCES OF RESERVOIR WATER LEVEL CHANGE TO SEISMIC ACTIVITY AND DEFORMATION

作　　者：孙毅[1] 牛安福[2] 任越霞[1] 

机构地区：[1]四川省地震局预报研究所,四川成都610041 [2]中国地震台网中心预报部,北京100036

出　　处：《内陆地震》2007年第3期251-257,共7页Inland Earthquake

摘　　要：对二滩电站水库蓄水后水位变化与水库库区、水库外围地区地震活动性进行了对比研究,并利用攀枝花南山台形变观测资料与水库水位变化之间的相关性,研究了"水库-小震-变形-中强震"之间的关系。结果表明,在由水位变化引起的加卸载过程中,加载时段是外围地区中强地震的有利发震时段,而卸载达到年度最低水平时,库区内地震活动明显增强。水库首次蓄水引起变形最为剧烈,之后影响逐渐减弱。Analyzing the water level change and seismic activity in and outer the reservior area after water storage for Ertan hydropower station, using the correlation of deformation datum of Nanshan station in Panzhihua and the change of reservoir water level, studing the relation between reservoir, small earthquakes, deformation and mid-strong earthquakes. The result shows that, when water level change, there is a course of load and unload for the reservoir. During load, the midstrong earth- quakes will occur outer the reservoir; When the water level is the most low, the seismic activity increased in the reservoir area. The first time of water storage will cause the biggest deformation. After it, the influence become weak.

关 键 词：水库 水位变化 地震活动 变形 

分 类 号：P315.7[天文地球—地震学]