锦屏一级水电站库区蓄水前后波速比变化研究  

The Seismic Velocity Ratio Changes before and after the Reservoir Filling of Jinping Hydropower Station

作　　者：赵敏[1] 龙锋[1] 宫悦[1] 

机构地区：[1]四川省地震局,四川成都610041

出　　处：《四川地震》2016年第2期22-26,共5页Earthquake Research in Sichuan

基　　金：中国地震局监测预报司2015震情跟踪项目(2015010124);四川省地震局2016科技专项(LY1608)

摘　　要：利用单台和达法计算锦屏一级电站木里地区地震波速比,结果显示:1波速比变化与库区水位升降具有一定的同步性,表明库区蓄水可能对当地波速比变化产生影响。2木里台与泸沽湖台存在的波速比整体差异反映了木里地区地下速度结构的横向不均匀性。3西侧子区的波速比值自2008年开始了长达4年多的趋势上升,分析认为这可能是2012年宁蒗5.7级地震前兆;表明在中强地震前可能会有较长时间的波速比上升。The seismic velocity ratio in the region of Muli County where the Jingping Hydropower Station is located in is calculated by using the Wadachi Method and data from one seismic station. Our results show that（ 1） the seismic velocity changes are relative to the level changes of the Jingping Hydropower Station.（ 2） The whole difference of seismic velocity ratio between Muli and Luguhu Seismic Stations indicates the anisotropy of the crust under the region of Muli County.（ 3） The seismic velocity ratio of the western Muli County had increased for 4 years since2008 which may be the seismicity precursor of the 2012 Ninglang M5. 7 Earthquake and it means that the seismic velocity around Muli County increases for long time before a strong earthquake.

关 键 词：锦屏一级电站 波速比 单台多震和达法 地下介质变化 

分 类 号：P315.3[天文地球—地震学]