1998年1月10日张北-尚义6.2级地震前昌平地震台应变资料的异常变化分析  

ANALYSIS ON ANOMALIES OF STRAIN DATA OBSERVED AT CHANGPING SEISMIC STATION PRIOR TO THE ZHANGBEI SHANGYI M S6.2 EARTHQUAKE ON JAN.10,1998

作　　者：王勇[1] 刘福生[1] 张国红[1] 张学政 

机构地区：[1]中国地震局地壳应力研究所,北京100085

出　　处：《西北地震学报》1999年第3期274-279,共6页Northwestern Seismological Journal

摘　　要：分析了昌平地震台体应变、线应变及差应变等观测资料在１９９８ 年１ 月１０日张北尚义６ ．２ 级地震前的异常变化．结果表明：该次地震前昌平台的应变观测资料出现了明显的趋势异常；体应变的异常时间与震级有较好的相关性；差应变资料显示了短临异常；由线应变资料计算的主应变方向在地震前逐渐向震中偏转； Ｍ２The anomalous changes in data of borehole strain measurement at Changping station before the Zhangbei Shangyi M S6.2 earthquake on Jan.10,1998 are analysed.The results show that trend anomalies in the data before the earthquake are obvious.Continuous time of the anomalies of body strain has a good relation to the magnitude.The short term and imminent anomalies in differential strain data have arisen.Orientation of principle strain calculated from linear strain data turned gradually towards the epicenter before the earthquake.The relationship between the anomalous changes of tide factor in body strain data and the earthquake is studied.

关 键 词：体应变 应变分析 趋势异常 临震异常 潮汐因子 

分 类 号：P315.7[天文地球—地震学]