震前地倾斜跃变异常初探

本文对临震前地倾斜跃变异常的基本记录特点、跃变达到峰值后发震时间关系及跃变矢量与发震方位的关系等作了初步探讨。得到了以下三点认识: (1)地倾斜跃变异常从出现到峰值这段时间的两倍加一个常数便是未来地震的发震时间。(2)地倾斜跃变的矢量方位多指向或背向震中。(3)地倾斜跃变异常持续时间越长,幅度越大,一般发震的震级就越大。

A PRELIMINARY STUDY OF THE ABNORMAL SUDDEN CHANGES OF GROUND TILT BEFOER EARTHQUAKES

The features of the abnormal sudden changes of ground tilt before earthquakes, statistical relationships between the duration of the sudden change to its peak value and the interval from the start point of the anomaly to earthquake occurrence and emperical relationships between the composite vector of the sudden change and the epicentral position are tentatively discussed in this paper. The conclusions are the following:(1) Doubled time from the starting point of the sudden change of ground-tilt to its peak value plus a constant equals the interval between the starting point and occurrence of earthquake.(2) The composite vector of the sudden change of ground tilt directs mostly to the epicenter, or back on the opposite direction.(3) Generally the longer the duration of the abnormal sudden change of ground tilt and the bigger the abnormal change, the greater the magnitude of earthquake after the anomaly.