摘要
1995年,我们采用P波初动半周期残差方法研究了内蒙古西部地区的震源介质参数,结果发现:西山咀周围地区Q值高达873,其他地区均在500以下。因而指出:乌拉特前旗(包头西)附近地区近期有发生中强地震的可能性。果然,在1996年5月3日包头西发生了6.4级地震。5月6日,我们利用丰富的余震资料又计算了该区的Q值,发现震后Q值已由873下降为323。这一结果不仅证实了包头西地震前高Q值异常的存在,而且也为当时包头西6.4级序列类型(主—余型)的判定提供了一条依据。
Abstract The Q value in the
west Inner Mongolia had been studied by the residual method of half period of P wave first
motion.The result showed the Q value had increased very high in 1995,it was 873 around
Xishanzui station.In other place,t he Q were under 500.This is the evident anomalism.So we
clearly pointed out the region had dangerousness about Ms6.4 earthpuake in
Wulateqianqi(west Baotou) rec ently.As expected,the M S6.4 earthquake occurred on May 3
1996 in t he west Baotou.We studied the Q at the same region by the post shock data again.
The Q had reduced to 323.This result had proved the existim of high Q anomalism before the
earthpuake and provided the proof to affirm the type(major-post shoc k)of the M S6.4
earthpuake in the west Baotou.
出处
《华北地震科学》
1999年第1期28-30,共3页
North China Earthquake Sciences