珊溪水库地区b值时空变化特征分析

Analysis of the Spatiotemporal Variation Characteristic of b-value in Shanxi Reservoir Area

对2002年至2016年10月珊溪水库地区地震资料进行处理,得出研究区域b值的时空分布特征。主要表现为水平向和垂直向b值不同的变化范围,不同区域存在b值的高、低值异常;2002年至2014年6月,研究区内出现低b值异常;2014年7月至2016年10月,总体呈现东南端高、西北端低的b值异常。研究发现,该地区ML≥4.0的地震主要发生在高b值与低b值的过渡区。

The temporal and spatial distribution characteristics of b-value in Shanxi reservoir area are obtained by processing the seismic data from 2002 to October 2016 in study area.The results mainly show that there are different ranges of b-value in horizontal and vertical direction,and there are high-low b-value anomaly in different regions.From 2002 to June 2014,it mainly showed the low b-value anomaly in the study area.From July 2014 to October 2016,it showed the high b-value anomaly in southeast and low anomaly in northwest.It is found that the ML≥4.0earthquakes in this area mainly occur in the transition zone of high and low b-value.