Abstract: 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.

Key words: Collapse earthquake, groundwater, Karst, geological hazard