辽宁岫岩—海城5.6级地震前盘锦地区地下流体异常特征

１９９９年１１月２９日辽宁岫岩－弧山５．６级地震肖，盘锦地区地下流体出现了明显的短临异常。水位异常具有一定的同步性，表现为先降后升，在上升过程中发震。异常出现的时间一般为１９９９年５、６月份，转向时间一般为１０月末至１１月初，与震中小震活动增强时间基本同步。水化学异常及水温及异常形成时间一般晚于水位异常，均为含量上升及温度升高的正异常。震前一周内还出现多种离子含量高值突跑异常及平时很少见的溶解氢异

ABNORMAL FEATURES OF UNDERGROUND FLUID IN PANJIN PRIOR TO XIUYAN-HAICHENG Ms5.6 EARTHQUAKE

There was obviously short-term abnormal phenomenon of underground fluid in Panjin area prior to Xiuyan-Haicheng Ms5.6 earthquake on 11, 29, 1999.The water level abnormity had definite synchronism. It descend first and then ascend. During the rising course, the earthquake happened. The abnormal phenomenon appeared in May or June,1999.The turning time was from the end of October to early November. The time of water level abnormity and the little seismic activity in the centre of this earthquake was synchronous.The time of most underground water chemical abnormity and water temperature abnormity drop were behind the abnormity of water level. There were saltatorial high data abnormity of a lot of ions and the abnormity of solution hydroger which was few peacetime in a week prior to XiuyanHaicheng Ms5.6 earthquake.This passage makes some approach about the relation of abnormal feature of undefground fluid with seismic essential factor and the question of the mid-term abnormity, long-term abnormity feature.