甘肃河西地区震源机制的初步研究

A PRELIMINARY STUDY OF FOCUS MECHANISM IN AREA OF GANSU HEXI

摘要:

众所周知中国西部及毗邻地区,从1897年印度阿萨姆8.6级地震到1957年蒙古阿尔泰大震,这六十年内发生了一系列强烈地震,形成了中国西部地区地震活动高潮期,以后便进入了相对平静,甘肃河西地区正是在这个背景下发生了1927年古浪8级大震,1932年昌马7.5级大震,1954年山丹7(1)/(4)级地震和同年民勤7级大震。

Abstract:

In this paper the focus mechanism and stress field of the seismic activities in area Hexi is studied by using the method of the solution in the small compound earthquake. The result shows that there is a clear difference between the seismic upsurge period and seismic quiet period in the seismic area; and it may be used as an indication of seismic activities in the area.