2017年精河M_S6.6地震震前，尼勒克台、巩留台和小泉沟台钻孔应变仪记录到了显著的高频信号异常变化，经现场异常落实确认异常是可靠的。本文通过超限率分析方法提取类似信号，定量描述了震前异常信号强度，结果表明地震前3个台不同程度出现超阈值现象，异常显著，其中2个台为临震变化。

Before the M_S6.6 earthquake happened in Jinghe, the borehole strain gauges of Nilka, Gongliu and Xiaoquangou seismic stations recorded significant abnormal changes in high-frequency signals, and it was reliable to confirm the abnormalities through on-site abnormalities. In this paper, the similar signals are extracted by the over-limit rate analysis method, and the abnormal signal intensity before the earthquake is quantitatively described. the results show that the super-threshold phenomenon occurs in different degrees before the earthquake, and the anomaly is remarkable. Two of them are changes in the impending earthquake.

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2018年震情跟踪定向工作任务（2018010210）、中国地震局地震科技星火计划项目（XH19049）共同资助