河北及邻区地磁加卸载响应比映震分析

Earthquake response analysis of geomagnetic LURR method in Hebei and its adjacent areas

应用地磁加卸载响应比方法,选取河北及邻区2008年1月至2016年10月FHD观测数据,研究地磁响应比异常与该区M 4.0以上地震的对应关系。结果表明:(1)近9年符合判据标准的地磁加卸载响应比异常有11组33次,其中7组异常有震例对应,在选定的14次震例中9次对应震前异常;(2)异常面积通常与最大异常强度成正比关系;(3)前兆异常时间与震级之间一般正相关;(4)组内各次异常位置多具有连续性和迁移性;(5)震中大部分出现在异常高值区。

By using the method of geomagnetic loading and unloading response ratio, the FHD observation data in Hebei and its adjacent areas from January 2008 to October 2016 are selected to study the corresponding relation between the response ratio anomaly and the earthquakes above M 4.0 in this area. The results show that：（1） In the last 9 years, there are 11 groups of anomalies that conform to the criteria of the criterion for 33 times, of which 7 exceptions have the corresponding earthquake cases, and 9 of the 14 earthquake cases correspond to the anomalies before the earthquake.（2） The abnormal area is usually proportional to the maximum anomalous intensity.（3） There is a positive correlation between precursory anomaly time and magnitude.（4） The abnormal locations in the group are more continuous and migratory.（5） Most of the epicenters appeared in the abnormal high value area.