Abstract:Based on water level data from the deep well, the flow data of Longzici spring, and water level data of some long-term observation holes in the structural area of Linfen seismic station, we analyze the overall change of groundwater state at Linfen seismic station and its surrounding areas. We further analyze the short level anomalies at Linfen seismic station in recent years according to the characteristics of regional water level change. The results show that the groundwater level of Linfen short-leveling site and surrounding areas changes significantly from 2011 to 2013, which is consistent with the change of the leveling observation curve. The time of leveling anomalies lags behind the change of water level by 2-3 a. The rising water level in a large range, especially in shallow water wells, which is caused by the decrease of groundwater exploitation not by structure. The ground rebound caused by water level rise accords with the principle of Terzaghi effective stress; that is to say, the water level rise recovers the pore-water pressure, the sand layer rebound and then causes the ground rebound, which further causes the change of the short-leveling height difference measurement value.
MENG Caiju,WANG Xiuwen,ZHANG Shuliang et al. Analysis of Short-Leveling Anomaly in Linfen Seismic Station Based on the Groundwater Change[J]. jgg, 2020, 40(11): 1206-1210.