岷县-漳县6.6级地震洞体应变异常特征

摘要

对宕昌地震台洞体应变观测资料异常变化进行分析，认为 EW 分量记录到岷县—漳县6.6级地震地形变过程，即震间形变→震前形变（包括加速变化期和失稳期）→同震形变→震后形变（包括震后滑动和震后调整）→震间形变。长时间的震后滑动记录在中国较为少见，此观测资料为地震孕育过程的研究提供了宝贵资料。%In this paper,the anomalous variation of cave volume strain data at Dangchang Seismic Station is analyzed. The result suggests that the data has recorded the whole process of earthquake deformation. The process is: interseismic deformation,then,preseismic deformation (which include the acceleration period and unstable period),then,coseismic deformation,then, postseismic deformation (which include the post seismic slip and the adjustment),and last, interseismic deformation. The post seismic slip of long duration is extremely rare in our country, so this data is extremely valuable for the study of earthquake gestation process.