多台求波速比方法的再探讨

近年来,多台求波速比广泛采用最小二乘法。这种方法物理基础较好,数学思路比较严谨,在预报实践中取得了一些可喜的苗头。但它要求小地震必须发生在孕震区内,并且要五个以上的台站能记到,才会有较好的和达曲线,为弥补这种局限性。我们提出了多台求波速比的又一新方法。其特点是:一、在正常情况下波速比为常数,有助于突出异常以得到明显的信息;二、尽量增加作资料用的小地震,包括孕震区外的一些邻近地震,以便及时提供震

A METHOD FOR FURTHER STUDYING THE SEISMIC VELOCITY RATIO ANOMALIES

A new method for studying the seismic velocity ratio anomalies was proposed. Its characteristics are:1). in the normal case the velocity ratio is a constant; 2). the anomalies are more obvious; 3). the data are added as many as possible, including those of earthquakes occurred in the boundary of the anomalous velocity ratio region, so that the information of the earthquake preparatory region can be provided in time. When the method is adopted to check the earthquake preparatory region in Gansu Province, better results have been obtained.