菏泽5.9级地震地磁异常的再研究

RE-STUDY ON THE GEOMAGNETIC ANOMALY OF THE HEZE 5.9 EARTHQUAKE

本文使用地磁短周期转换函数和提取地磁局部异常的方法,对菏泽5.9级地震前后地磁场的变化进行了再研究。结果表明:该次地震前,菏泽及其附近地区存在地磁短周期成份的异常变化和地磁基本场局部异常。这些异常和地震活动性参数b值、小震活动及其它一些前兆异常出现的时间同步,形态相似。

Using the short-period conversion function and extracting local anomaly from the geomagnetic field, we have re-studied the variation of the geomagnetic field before and after the Heze 5.9 earthquake. It is concluded that before Heze 5.9 earthquake, there exists anomalous variation in short-period component of the geomagnetic field and local anomaly of the fundamental geomagnetic field in Heze and its vicinity. These anomalies synchronize and have similar shape with the b-value, activity of small earthquakes and some other precursory anomalies.