岫岩—海城5.6级地震前的水化学异常

岫岩－海城５．６级地震前辽宁省一些井孔水化学出现了明显的中趋势异常和短临异常。本文就异常情况作了全面介绍，并对异常形态、特征等作了初步分析研究。这些异常井孔在时间上与地震活动、其它前兆异常基本同步，为统一应力作用的结果。

HYDROGEOCHEMICAL ANOMALIES PRIOR TO XIUYAN-HAICHENG Ms5.6 EARTHQUAKE

Just prior to Xiuyan-Haicheng Ms5.6 earthquake, the hydrochemical component appeared obviously medium-long-term, short-term and impending anomalies in some wells distributed in the area of Liaoning province.In this paper, the anomalies are overall introduced, the shapes and the features of the anomalies are preliminary analyzed. These abnormal wells appear consistent with the seismicity and other precursors on the features of time, and to be the action result of a united stress field.