汪清7.2级深震地下流体动态异常探析  

Study on the subsurface fluid anomalies before Wangqing Ms7.2 deep earthquake

作　　者：李富[1] 刘俊清[1] 张晨侠[1] 张洪艳[1] 

机构地区：[1]吉林省地震局,吉林长春130022

出　　处：《华北地震科学》2003年第3期19-22,共4页North China Earthquake Sciences

摘　　要：2002年6月29日汪清7.2级深震前,吉林省地下流体观测网部分井孔观测到一组从趋势到短期前兆异常。本文阐述这些异常出现的特征和时空演化过程。认为异常出现的时间与震中距密切相关,其空间展布具有迁移性,中期异常由外围向震中收缩,其速率很小,进入短期阶段,岩石处于失稳、临失稳状态,水位异常由震中向外围发散,速率迅速加大。同时发现了异常盲区即深震的震中区,它对预测深震中有非常实际的意义,同时对研究板块运动、地球动力学过程也有一定的参考价值。Before Wangqing Ms7.2 deep earthquake occurred on June 29 of 2002, a group of tendency and short-term precursory anomalies were observed by part wells of the subsurface fluid observing net in Jilin. The characteristics of these anomalies and its evolving process in time and space are presented here. The results show that the time that anomalies appear is relevant to distance of epicenter, and its distribution has migratory feature, which contracts from outside to inside with a low speed in medium term period, and exhales from epicenter to outside with a high speed in short term period. The blind zone of anomaly is epicenter region.

关 键 词：深震 地下流体 前兆异常 时空演化 异常盲区 

分 类 号：P315.72[天文地球—地震学]