特别是短周期的地磁异常变化与地震发生前后的地磁扰动密切相关。

It is closely relationship between the short period geomagnetic anomalies and disturbance before and after the earthquake.

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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。

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.

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