临夏台分量钻孔应变观测与岷县—漳县6.6级地震的相关性分析  

Correlation between Component Borehole Strain Observation at Linxia Seismic Station and the Minxian-Zhangxian M6.6 Earthquake

作　　者：史小平 张磊 姜振海 SHI Xiaoping;ZHANG Lei;JIANG Zhenhai(Gansu Earthquake Agency, Lanzhou 730000, Gansu, China)

机构地区：[1]甘肃省地震局,甘肃兰州730000

出　　处：《地震工程学报》2020年第2期391-395,共5页China Earthquake Engineering Journal

基　　金：流动地球物理场观测(ZX1803001);甘肃省地震局科技发展基金(2016Y01);中国地震局专项“全国地球物理台网数据跟踪分析与产出”。

摘　　要：对临夏地震台分量钻孔应变2008—2018年观测数据的可靠性进行了分析,发现S1+S3和S2+S4的年相关系数均值达到了0.98以上;计算的主应力和主方向结果表明:主方向在2013年岷县6.6级地震前存在明显的趋势转折,主应力的变化趋势在去除趋势漂移后,存在先降后升的变化特征,岷县6.6级地震就发生在趋势转变当中。The reliability of component borehole strain observation data of Linxia station from 2008 to 2018 was analyzed.The means value of the annual correlation coefficient between S1+S3 and S2+S4 was found to be more than 0.98.The calculated results of principal stress and direction showed that there was an apparent anomalous change in the principal direction before the Minxian M6.6 earthquake in 2013;after removing the trend drift,the change characteristics of the principal stress first decrease and then increased,and the Minxian M6.6 earthquake occurred in the change of trend.

关 键 词：分量钻孔应变 主应力 主方向 岷县6.6级地震 

分 类 号：P315.75[天文地球—地震学]