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根据地震空区的特征,选定了七个参量作为空区的判别标识,并发展了一套用计算机自动识别空区的程序。对于所研究的地区,程序中按一定间隔选择待分析的判别地区中心点。然后,由程序按给定的七个参数之值判定在每一点周围是否存在地震空区。如果识别出了一个空区,它的位置和形状即用一条与其拟会的二次曲线的参数来描述。对不同时段的地震目录数据作同样的扫描识别,最后确定出符合判别标识的空区出现次数、各次持续时间、空区长短轴及其取向、空区面积等参数。
According to the characteristics of the earthquake area, seven parameters were selected as the discriminant marks of the vacant area, and a set of procedures for automatically identifying the vacant area by computer was developed. For the study area, the program selects the center point of the area to be analyzed at certain intervals. Then, the program determines the presence of a seismic void around each point by the value of the given seven parameters. If an empty area is identified, its position and shape are described by a parameter of the conicoid to which it is intended. The same scan identification is made for the earthquake catalog data of different time periods. Finally, the number of occurrences, the durations, the short axis and the orientation of the empty area, the area of the empty area and the like are determined according to the identification marks.