说明地磁异常变化是一种有希望的地震前兆现象。
It indicated that the geomagnetic anomaly is a promising phenomenon in the studies of earthquake precursors.
从全球磁场减去地核主磁场和变化磁场及其感应磁场后，就得到岩石圈磁场，又称地壳磁场，或地磁异常。
The crust magnetic field, or lithospheric magnetic field, can be deduced by subtracting the main field, variation field and its induced counterpart from the total field.
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.
测区内未发现有局部地磁长期变化异常。
No anomalous local secular geomagnetic variation has been found in the area.
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.
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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