摘要
本文以地震序列的11项特征参数作为指标,采用 ISODATA 模糊聚类方法对地震序列进行分类,以 M≥M_—0.3为标准将地震序列分为两类;Ⅰ类为震后三个月内还有震级为 M≥M_0-0.3的地震发生;Ⅱ类为主震 M_0后无 M≥M_0-0.3级的地震。以中国大陆地区1966年以来的39次地震震例序列建立震后判别模型,然后以近期发生的4次中强震和5次云南地震进行了外推检验,结果表明,该方法对地震序列类型的判别具有较好的效果。
In this paper,earthquake sequences have been classified by using fuzzy cluster method.11 items of characteristic parameters of ear thquake sequences have been chosen as indexes.According to the standard of MMo-0.3, earthquake sequences are divided into two categories:typc-Ⅰ sequences are these in which earhquakes with MMo-0.3 occur in the same area within 3 months after a moderate or strong earthquake(Mo4.7);type-Ⅱ sequences are these in which no MMo-0.3 earthquakes occur within 3 months.The discriminating model of post-earthquake tendency has been built by using 39 known earthquake sequences occurred in the continent region of China since 1966.Then,extrapolation tests are taken by using 9 earthquake sequences recently occurred in China.The results indicate that this method has good effects on discrjminating the type of earthquake sequences,and can be used in henceforth prediction practice.
出处
《四川地震》
1991年第3期24-32,共9页
Earthquake Research in Sichuan
