唐山7.8级地震前水氡异常演化特征

EVOLUTION FEATURE OF RADON ANOMALY IN GROUNDWATER BEFORE THE TANGSHAN MS7.8 EARTHQUAKE

摘要:

应用华北地区36个水化观测点的水氡观测资料,以半年为尺度对唐山7.8级地震前水氡的异常演化过程进行了系统研究.结果表明:该次地震前水氡异常存在由外围向震中区迁移的特征.异常先在外围地区出现,短临阶段才在震中区附近形成较强的异常区.异常形态有由复杂向简单演化的特征.震后水氡动态演化图像呈现离散态势,并逐步恢复正常.

Abstract:

Observation data of radon in groundwater of 36 wells in northern part of North China are used to study the evolution processes of radon anomaly before the Tangshan M_S7.8 earthquake taking per half year as scale.The results show anomalies of the radon in groundwater progressed from outer ring to epicentral region and anomalous pattern changed from complicated to simple before the earthquake.In the short impending stage,strong anomaly region was formed at Tangshan area.After the earthquake,the anomalous pattern dispersed and normally recovered.