1989年大同一阳高6．1级地震前山西倾斜形变前兆异常特征

根据山西多年的倾斜形变观测资料，综合研究了大同－阳高６．１级地震前的中长期孕育过程、中短期前兆异常特征、震前微破裂所显示的固体潮畸变临震异常，以及震前山西地震带形变应力场状况。采用“实用化攻关”方法识别异常进行分析得出，震前山西大部分倾斜形变台站存在一定的异常变化的结论。

Precursory Anomalous Characteristics of Tilt Deformation in Shanxi Before l989 Datong -Yanggao M6.1 Earthquake

he seismogenic process in the long-and mid-range,precursory anomalous cbaracteristics in the mid-and short-range,earth tide distortion showing by the pre-erathquake microfractures,and deformationstress field state before the Datong-Yanggao M6.1 earthquake are synthetically analyzed in the paper. Theresults from recognized anomalies by the method of the key task on the application suggest that there weresome preearthquake anomalous variations in a greater part of the tilt stations of Shanxi Province.