甘肃及邻区b值与中强震的关系研究

本文研究了甘肃及邻区8个小区域的背景b值和计算b值的最小震级下限,对计算b值的两种常用方法优缺点进行了比较,同时,研究了甘肃及邻区b值与中强地震的关系。研究结果表明,在甘肃及邻区,中强震前震中区及邻区的b值往往呈现低b值,与中强地震的对应率约为50%。作者认为,在日常的地震监测预报工作中,b值可作为一种较有效的判断指标。

THE RELATION OF THE B-VALUE CHANGES TO THE MODERATE EARTHQUAKES IN AND NEAR GANSU PROVINCE

First, to the eight minor regions in and near Gansu Province, the background b-values are computed and the least magnitude lower-limits for the calculation of the b-values are determined. Then, the two calculation methods are compared. Finally, the relation of the b-value changes to the moderate earthquakes is discussed. The research shows that there are some abnormal changes of b value in and near epicentral regions before about half of the moderate earthquakes that are studied in this paper. The change of b value can be regarded as a reference factor for earthquake prediction.