河西堡台传递函数的时间变化及其与地震的关系

The Discussion on the relation Between the Changes of Transfunctions with Time and the Seismoactivity near Hexibao

摘要:

本文分析了河西堡地磁台1980年至1984年期间的传递函数随时间变化与邻区250公里内,4.0级以上地震活动性之间的关系。结果表明,河西堡地磁台在无震时的传递函数A一般为0.18左右,B一般为0.01左右,而在地震之前,A一般呈现出减小变化,变化幅度约为0.05左右,异常持续时间约为7个月至一年。而震前B的变化呈增大变化,变化幅度约为0.1左右。
同时本文指出,河西堡地磁台的传递函数A、B因子均有季节变化,A值夏季小于冬季,B值夏季大于冬季。在扣除季节变化后,以上所述地震前的传递函数A、B的异常幅度较未扣除季节变化的地震前的异常更加明显。

Abstract:

In this paper, relation between the transfunction at Hexibao and the seismoactivity of magnitude Ms above 4.0 within 200 km during the period from 1980 to April 1984 were analysed. The results suggested that the transfunction A generally be about 1.8 and B be 0.02 more of less during the period without earthquake. But before the earthquakes A decreases by about 0.05 and B increases by 0.1 more or less.
Meanwhile it is pointed that there were seasonal changes in both A anb B at Hexibao. A is less in summer than in winter, but B is more in summer than in winter. It is more obvious after deducting seasonal changes from A and B respectively than that without deducting such changes.