龙滩水库地震精定位及活动特征研究  

Study on precise relocation of Longtan reservoir earthquakes and its seismic activity

作　　者：陈翰林[1] 赵翠萍[1] 修济刚[2] 陈章立[2] 

机构地区：[1]中国地震局地震预测研究所,北京100036 [2]中国地震局,北京100036

出　　处：《地球物理学报》2009年第8期2035-2043,共9页Chinese Journal of Geophysics

基　　金：十五国家科技支撑计划(2006BAC01B04-02-01)资助

摘　　要：本文利用结合了波形互相关技术的双差定位法对龙滩库区2006年至2007年发生的地震进行了精确定位,并对其活动特征进行了分析.通过定位结果的比较,证明利用波形互相关技术提取的地震对的P、S波走时差数据及双差精定位法显著地提高了定位的精度和质量.对龙滩库区地震活动特征的研究结果表明,龙滩库区的地震活动与水库蓄水过程密切相关,成丛分布的地震活动分别表现出对水库蓄水过程不同的响应过程和活动特征,反应了龙滩库区在岩性特征、渗透条件、地质构造及应力场等方面存在局部性差异.In this paper, we relocated earthquakes occurred around Longtan reservoir from 2006 to 2007 by using hypoDD relocation method and waveform cross-correlation technique, analyzed its seismic activity. Relocation results by applying the waveform cross-correlation technique and hypoDD method demonstrates that the earthquake location quality are obviously enhanced. Analysis of the characteristics of seismicity around Longtan reservoir proved that there is a tight correlation between the seismic activity around Longtan reservoir and the process of reservoir recharge. Earthquakes clustered around Longtan reservoir region and performed different response corresponding to water level change respectively, indicating that there may exist local differences of lithological characteristic, penetrative condition, geological structure, as well as stress field condition around the Longtan reservoir.

关 键 词：水库地震 地震精定位 双差定位法 波形互相关 

分 类 号：P315[天文地球—地震学]