摘要
本文利用余震震中分布、震源机制解、地震记录波形、等震线分布形态、地裂缝及地质构造资料,对大同一阳高震群序列中5.7、6.1、5.6级三次地震的破裂方向进行探讨。认为5.7级地震破裂方向为近东西向,6.1、5.6级地震破裂方向为北北东向,由二组破裂形成共轭剪切破裂,大同一阳高震群序列就发生在共轭剪切破裂面上。 1989年10月18日—19日在山西大同—阳高—带相继发生了5.7、6.1、5.6级地震,地震发生后笔者参加了地震现场分析预报组的工作,工作中发现5.7、6.1、5.6级地震破裂方向并不一致,有必要进行讨论。
In this paper, a discussion is made on the fracture directions of the M5.7, M6.1 and M5.1 earth-quakes in the Dation-Ranggao seismic sequence according to the epicentral distribution of the after-shocks, focal mechanism solutions, wave forms, isoseismic distribution, ground fissures and geological data. It has been considered that the fracture direction of the M5.7 earthquake is nearly EW, and that of the M6.1 and M5.6 earthquakes is NNE, these two groups of fractures formed a conjugate shear frac-ture, the Datong-Yanggao seismic sequence occurred right on the plane of the conjugate shear fracture.In October 18-19 in 1989, in Datong-yanggao region in Shanxi Province successively occurred the M5.7, M6.1 and M5.6 earthquakes. After the earthquakes, the Author participated in the work of the earth-quake analysis and prediction group in situ. In the work, the author found that the fracture directions of the M5.7 M6.1 and M5.6 earthquakes are not consistent, so it is neccesary to make a discussion on it.
出处
《华北地震科学》
北大核心
1992年第2期50-57,共8页
North China Earthquake Sciences
