海城地震震后异常与后续新地震(唐山地震等)异常的识别和研究

Recognition and Research on Post earthquake Anomalies of Haicheng Earthquake and Anomalies of Sequent Earthquake

１９８９年１０月１８日，山西大同—阳高发生５．７级地震，１０月１９日再次发生６．１级地震，同日又在当地发生了３次５级以上地震。这次地震是１８１５年平陆６３４级地震后，山西地震带发生的强度最大的地震。１．５ａ以后，即１９９１年３月２６日又在大同—阳高一带发生了５．８级地震，在此之前，１月２９日在忻州亦发生５．１级地震。综合分析了大同—阳高６．１级地震各前兆学科震前、震后的变化情况，将所有震后变化按其状况归为以下６种类型：（１）震前异常在震后继续平稳发展；（２）震前异常在震后幅度加大；（３）震前异常结束，震后又出现异常；（４）震前无异常，震后出现异常；（５）震前异常在震后恢复正常；（６）震后资料中断或条件改变。探讨了这６种状况与新地震异常的关系，对每项震后变化按其与后续地震的关系归为以下６种类型：（１）强余震前兆；（２）老震区更大地震的前兆；（３）新区地震的前兆；（４）长期震后效应；（５）突变震后效应；（６）无后效。在综合研究这２种方式分类的数量关系及其它带有一定规律性特征的基础上，得出识别震后效应与后续新地震异常的指标与方法：（１）大同—阳高６．１级地震后前兆异常（共８９项）大部分恢复，呈现了异常逐步衰减的图?

The anomalies after Haicheng earthquake with M =7 3,occurred on February 4,1975,have been analyzed and discussed termwise,the fairly credible inner link between the some post earthquake anomalies and the sequent earthquakes at Yingkou( M 6 0)and Tangshan( M 7 8)has been discovered.Based on the summary of the anomalous characters after the Haicheng earthquake,6 suggestions which will be common significative of the sequent earthquake prediction on homogeneous condition have been proposed.