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； Ｍ２
The 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.
出处
《西北地震学报》
CSCD
1999年第3期274-279,共6页
Northwestern Seismological Journal
关键词
体应变
应变分析
趋势异常
临震异常
潮汐因子
Body strain
Strain analysis
Trend anomaly
Short impending anomaly
Tidal factor
Orientation of principle strain
Zhangbei Shangyi earthquake
