流动磁测在地震预报中的作用

利用河北省地震局华北测区流动磁测资料 ,分析了华北地区张北等几次较强地震前后地磁场的变化。结果认为 :震前异常的发展有扩大的趋势 ,震后或临震前基本恢复 ,异常持续时间一般半年以上 ,可作为中期异常 ,在此背景下进行短临预测追踪效果较好。

EFFECT OF MOBILE GEOMAGNETISM OBSERVATIONIN EARTHQUAKE PREDICTION

By analyzing the mobile geomagnetic data observed at North China, it is found that the geomagnetic field had the same anomalous variation around the several shocks which occurred in Zhangbei of North China, i.e., the anomalous areas had the same varying process from enlarging to shriking. In generally, the anomalies lasted over half a year, so they can be regarded as medium term anomalies. It will have good results to make a short term and impending earthquake tracing under this kind of background.