系统聚类法在华北地区的地震分期和预测中的应用

本文用修改了的系统聚类法研究华北地区地震活动期,结果表明,当类间距离用离差平方和增量距离,且样品间用欧氏距离时,能较好地划分该地区的地震活动期。而样品间用相似系数时,不论类间距离是哪一种,所得结果均较差。本文还作了地震活动期的后验预测尝试,还通过逐次筛选方法对21个特征进行了选择。

DIVIDING SEISMIC ACTIVE PERIODS WITH MODIFIED HIERARCHICAL CLASSIFICATION METHOD

The Modified Hierarchical classification Method is used to divide seismic active periods of Northern China in this paper. The seismic active periods divided are better when the distances between classes are increment of square sum of deviation and the distances between samples are Euclidean Distance than that when the distances between classes are any kind of method mentioned in the paper and the distances between samples are resemblance coefficient. The methods of predicting seismic active peroids and selecting features are proposed, and they are used as well. After features are selected by our method the classification results can be improved and the posterior prediction made are consistent with actual state basically.