强震前地电阻率短期异常特征与识别标志研究

The research on recognizing symbol and short-term abnormal characteristic of geoelectrical resistivity before the strong earthquake

从地震信息“场”的概念出发,利用空间线性度方法,对强震近震源区的地电阻率观测资料进行组合计算,得到描述孕震过程中震源区附近新的前兆特征量——空间线性度。本文分析计算了华北地区发生的7次6级以上强震前的地电阻率观测资料,结果表明,强震前半年内震源区附近的空间线性度a有明显的下降异常变化。

Based on the concept of field in seismic information, using the measure of the spatial linearity to observe and calculate the geoelectrical resistivity, we can find the premonitory characteristic value, spatial linearity short-term abnormal characteristic value (a ), which describes the earthquake source district in the course of earthquake pregnancy. By analyzing the data of geoelectrical resistivity in the seven times strong earthquakes above M6.0 previously happened in North China, we can conclude that the spatial linearity (a) will decline obviously in the earthquake source district before half a year of the strong earthquake.