扎兰屯地区测震学指标分析

Seismological Index Analysis in Zhalantun Area

文章运用2008至2016年内蒙古地震台网观测资料,对扎兰屯地区的b值、波速比时空特征进行分析。根据震例和经验,低b值和波速比低值有一定的震兆意义。b值空间扫描结果显示,额尔古纳和阿荣旗地区为低b值区域。波速比空间上看,牙克石和扎兰屯一带为波速比低值区域,波速比在空间上西北侧高、东南侧低。结合b值、波速比构造特征,判断牙克石-扎兰屯可能为应力积累区域。

Based on the observation data of Inner Mongolia Seismic Network from 2008 to 2016,the spatial and temporal characteristics of b value and wave velocity ratio in Zhalantun area are analyzed.The low b value and low wave velocity ratio have certain precursory significance according to the earthquake cases and experience.The spatial scanning result of b value shows that the low regions of the value are in Eergu＇Na and Arong Qi area.The area of Yakeshi and Zhalantun is regions with low velocity ratio,which is higher in the northwest and lower in the southeast.Combined with b value and wave velocity ratio,the Yakeshi-Zhalantun area may be the stress accumulation area.