三峡水库蓄水后巴东地区波速比(Vp/Vs)研究  

ON WAVE VELOCITY RATIO(Vp/Vs) IN BADONG AREA AFTER IMPOUNDMENT OF THREE GORGES RESERVOIR

作　　者：陈俊华[1] 甘家思[2] 李普丽[2] 薛军蓉[2] 李峰[2] 李垠[2] 

机构地区：[1]中国科学技术大学地球与空间科学学院,合肥230026 [2]中国地震局地震研究所,武汉430071

出　　处：《大地测量与地球动力学》2007年第F06期12-14,42,共4页Journal of Geodesy and Geodynamics

基　　金：中国科技部社会公益研究专项(2004DIB3J131);长江三峡工程开发总公司资助项目

摘　　要：采用固定台站法计算了三峡水库蓄水后湖北省巴东地区ML2.0以上地震的波速比值,并给出了各自的相关系数。结果显示,巴东地区地震波速比值变化与水库地震的震源浅,裂隙发育,水的渗入作用等有关,并存在扩容期间波速比降低,震前波速比回升的现象。The multi-station method is applied to calculate wave velocity ratio and its coefficient of earthquakes above ML2.0 in Badong area after the impoundment of the Three Gorges reservoir. The result shows that the variations of wave velocity ratio are related to the shallow epicenters ,fracture growing and infiltration diffusion of water in the area. It is shown that the ratio decreases in the dilatancy-diffusion phase and increases before the earthquake . The area is rich in underground water so the wave velocity ratio is higher than that in some other area.

关 键 词：三峡水库 巴东地区 水库诱发地震 固定台站法 波速比 

分 类 号：P315.31[天文地球—地震学]