2016年新疆阿克陶6.7级地震前重磁变化特征分析

Analysis of Mobile Gravity and Mobile Magnetic Characteristics before the Xinjiang AKto M_S6.7 Earthquake in 2016

利用南天山地区3年的流动重力和流动地磁资料,分析阿克陶6.7级地震前区域重力场与地磁场的异常特征。结果表明:(1)阿克陶6.7级地震前重力场年尺度动态变化图像和差分动态演化图像显示乌恰和布伦口地区均出现较显著的流动重力异常变化;(2)地震前岩石圈磁场的水平矢量方向和磁偏角均发生较大变化。

Using the multiple -scale mobile gravity and magnetic data in southern Tianshan area, we systematically analyzed the anomaly characteristics between the spatial - temporal gravity and magnetic changes before the AKto Ms6.7 earthquake in Xinjiang. The results showed that： （ 1 ） Before the occurrence of great earthquake, the continuous significant changes occurred in Wuqia and Bulunkou areas in a year scale gravity fields, as well as larger time scales. （2） The horizontal vector and magnetic declination of the lithosphere magnetic field ap- peared anomalous change before the AKto Ms6.7 earthquake.