内蒙古中西部地区视应力特征分析

ANALYSIS ON THE CHARACTERISTICS OF APPARENT STRESS IN MIDWEST INNER MONGOLIA AREA

本文利用呼和浩特数字地震遥测台网7个子台记录的119个质量较高的地震事件资料,基于遗传算法,采用Atkinson方法、Moya方法,反演得到了地震的震源谱参数、震源参数。在此基础上,从视应力的定义出发,根据反演得到的震源谱参数以及地震能量与震级的相互关系,计算得到了119个地震的视应力。并对它们之间的相互关系进行了讨论,结果显示,应力降、视应力与震级具有较好的线性关系,震源半径、应力降与视应力具有一定的相关关系。内蒙古中西部地区的高应力降和视应力区域主要集中在研究区的西南部。

In this paper, based on 119 seismic events data recorded in 7 digital seismic stations in Hohhot, the source parameters and focus spectrum parameters have been inversed by using Atkinson and Moya method and genetic algorithm. On the other hand, according to the definition of apparent stress, the focus spectrum parameters and the relationship between earthquake energy and earthquake magnitude, the apparent stress of 119 seismic events are calculated. The relationship between source parameters and apparent stress has been discussed .The result shows that there is better linearity relation among stress drop, apparent stress and earthquake magnitude. There are some correlations for sauce radius, stress drop and apparent stress. The remarkable area of stress drop and apparent stress mainly focus in southwest area of Midwest Inner Mongolia.