乌什300km内6级强震的应变异常特征初步分析

A Preliminary Discussion of the Strain Anomaly at WuShi Station

自1984年乌什架设高精度钻孔应变以来,乌什300km内发生了9组共16次6级地震,在这些地震前应变仪器记录到了异常。本文对乌什台应变异常特征进行了初步分析,认为钻孔应变对乌什300km内的地震有较好的映震能力,以短期、短临异常为主,以张性突跳、波动不稳定变化为特征。

Since the setup of the high precision borehole strain at Wushi station in 1984, 9 groups of earthquakes of magnitude 6 and above, 16 times in all, have occurred within the range of 300 kilometers around Wushi station. Our borehole strain data show there were anomalies before these shocks. In this article, a preliminary analysis of the characteristics of the borehole strain is made. We believe that the borehole strain, mainly featured by the short-term anomaly and short-imminent anomaly and with the tensile pulsations and instable changes with large amplitude fluctuating, would record earthquake precursors to some extent within the range of 300km around Wushi station.