地震学报2018，Vol.40Issue(1)：58-66,9.DOI:10.11939/jass.20170114
四川锦屏水电站地区的剪切波分裂参数变化
Changes of shear-wave splitting parameters in Jinping hydro-power station, Sichuan
摘要
Abstract
This paper focused on the influences on the seismic activity and the crustal stress caused by three water storages in Jinping hydro-power station,according to the seismic activity in Jinping hydro-power station and the change of shear-wave splitting parameters of the station MLI from January 2012 to December 2013.The results show that,after three water storages,the seismic activity in this region continued to increase,especially after the second water storage,and finally remained at a high level.Moreover,the polarization direction of fast shearwave at the seismic station MLI also showed significant changes before and after three water storages of the hydro-power station.Before the water storage of Jinping hydro-power station,the predominant polarization direction at MLI seismic station was northeast,which was in agreement with the strike of Jinpingshan-Xiaojinhe fault.After the first storage,the polarization directions are distributed scatteredly.After the second water storage,the predominant polarization direction changed to southeast.And the polarization directions showed the southeast consistently after the third water storage.As for the station MLI,the delay time of slow shear-wave has changed before and after the three storages of Jinping hydro-power station,especially after the second storage the delay time of slow shear-wave decreased obviously.Thus,the seismic activity,the polarization directions of fast shear-wave and the delay time of slow shear-wave changed significantly after the second water storage of Jinping hydro-power station,suggesting that the direction of crustal stress changed quickly in a small region after the second water storage,and the crustal stress also released with the enhanced seismic activity.关键词
地壳应力/地震活动性/剪切波分裂参数/锦屏水电站Key words
crustal stress/seismic activity/shear-wave splitting parameters/Jinping hydropower station分类
天文与地球科学引用本文复制引用
刘莎,吴朋..四川锦屏水电站地区的剪切波分裂参数变化[J].地震学报,2018,40(1):58-66,9.基金项目
中国地震局地球物理研究所基本科研业务费重大研究计划(DQJB15C02). （DQJB15C02）
