2010年广西庞凌河流域一次地震事件的灾害过程及其成因*

利用现场调查资料重组了2010年3月6日庞凌河流域中的一次陷落地震的灾害过程,并结合现有的水文地质资料和地震记录探讨了该次事件的成因。结果表明:该次事件的地下水异常点均位于龙临—头布暗河系统中,个别异常点位于断裂上,断裂内部的岩溶物质相对疏松。地震波的分析结果表明本次地震事件具有陷落地震的特征。地震发生在前,地下水异常发生在后。据此认为,本次事件可能是一次陷落地震,陷落的岩溶不仅造成了地震,还堵塞了地下河,进而造成了地下水异常。

A Case Study of Hazard Process and its Origin of an Earthquake in the Panglinghe River Basin in 2010

In this paper,the field investigation data are used to understand the process of the earthquake-groundwater anomaly event happened on March 6,2010.Hydrogeological data and the seismic wave records are used to analyze the origin of this event.The result shows that the groundwater anomalies are located in the Longlin-Toubu underground river system,and the individual abnormal points locate on faults.The Karst in the fault is relatively loose.The earthquake event occurs earlier,and the groundwater anomaly later.The results of seismic waves indicate that the event has the characteristics of collapse earthquake possibley caused by karst collapse.The karst collapse not only caused the earthquake event,but also blocked in the underground river,and then resulted in the abmorality of groundwater.