鄂尔多斯西南缘前兆异常与映震关系分析

ANALYSIS ON THE RELATIONSHIP BETWEEN THE PRECURSORY ANOMALIES AND THE REFLECTED EARTHQUAKES AROUND THE SOUTHWESTERN MARGIN OF THE ORDOS PLATEAU

对鄂尔多斯西南缘114个前兆测项的资料进行了分析,结果显示鄂尔多斯西南缘前兆观测在1985、1986,2003、2006年5月~2007年10月、2008年7月~2009年6月期间,前兆观测异常数目、异常比例数相对偏高,异常空间分布有所集中,且在异常数目、异常比例数增高之后,异常点分布周边区域相继发生中强地震。

The precursory data of 114 items around the southwestern margin of the Ordos Plateau have been analyzed.The results show that in 1985,1986,2003,May 2006 to October 2007,and July 2008 to June 2009,the number and the ratio of precursory anomalies are relatively high and abnormal spatial distribution were relatively concentrated.And after these phenomena appeared,several mid-strong earthquakes occurred in succession in the surrounding area where the abnormal points distributed.