邢台5．4级地震前的流动重力和地磁异常初步研究

Study on the gravitational and geomagnetic anomalies before Xingtai Ms 5.4 earthquake

根据测值空间变化等值线和时序变化曲线，分析了2002年邢台5．4级地震前流动重力和流动地磁异常的动态演化。两种异常震前表现出如下特征：①流动重力、流动地磁观测资料均有较为明显的前兆异常反应；②地震发生在重力变化的“0”等值线附近；③流动地磁部分点位测值呈现趋势性异常，震前全部点位观测值整体上升，形成完整的高值异常区。

Based on the isolines and images, the evolution of gravitational and geomagnetic anomalies before Xingtai Ms 5.4 earthquake in 2002 is analyzed. The two kind anomalies showed the following characteristic, clear gravitational and geomagnetic anomalies all appeared in the observational data; the variation of gravity became stronger and the earthquake occurred near the 0 isoline of gravity~ the geomagnetic values in part of the mobile observation sites showed tendency anomaly, and a high value anomaly region was formed with the increasing of the observational values in the whole network.