新疆精河6.6级地震前精河水平摆异常特征分析

The Analysis of Anomalous Characteristics of Jinghe Horizontal Pendulum before Jinghe 6.6 Earthquake in Xinjiang

以精河水平摆观测数据为研究对象,通过定量剔除温度对观测数据的影响,提取观测数据的异常特征。然后结合2017-08-09新疆精河6.6级地震的发震构造、震源机制、台站位置等,对精河水平摆的震前异常进行深入探讨。NS分量自2016-06起持续N倾,EW分量自2016-09起快速E倾,2016-12-17其E倾速率再次加快,幅度达0.48″的两项异常为精河6.6级地震前应力积累所致。

Taking Jinghe horizontal pendulum observation data as the research object,we eliminate the influence of temperature on observation data to extract the abnormal characteristics of observed data.Then,combining this with the seismogenic structure of the earthquake,focal mechanism,station location and seismogenic tectonic relationship,etc.,before the earthquake anomaly of Jinghe horizontal pendulum,we infer:(1)the NS component continues to be inclined since June 2016;(2)the EW component has been rapidly leaning since September 2016,and on 17 December the rate of leaning accelerates again by 0.48,which is caused by the stress accumulation before the magnitude 6.6 earthquake.