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用超限率分析法提取精河6.6级地震前的高频信号异常
高丽娟, 李尚伟, 滕海涛
新疆维吾尔自治区地震局, 乌鲁木齐 830011
摘要:
2017年精河MS6.6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。
关键词:  精河MS6.6地震  定点形变  超限率分析  高频信号  地震前兆
DOI:
分类号:P315
基金项目: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
Extracting High Frequency Signal Anomalies before the Jinghe MS6.6 Earthquake with Overrun Rate Analysis
Gao Lijuan, Li Shangwei, Teng Haitao
Earthquake Agency of Xinjiang Uygur Autonomous Region, Urumqi 830011, China
Abstract:
Before the MS6.6 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.
Key words:  Jinghe MS6.6 Earthquake  Fixed point deformation  Overrun rate analysis  High frequency signal  Earthquake precursor