汶川地震近区深层井孔-含水层系统水位异常响应研究

Research on abnormal response of groundwater levels in deep wells in the near-field to the Wenchun Earthquake

摘要: 本文探析了汶川地震近区深层井孔-含水层系统在不受水量交换的影响下地下水位的动态变化特征。结果表明,大地震的发生往往能够引起较大范围内深层井孔-含水层系统地下水位明显的异常变化,地震引起的地下水位异常变化特征比较复杂,具有异常形态变化多样,变化幅度不等,变化空间分布不均一,时间分布多阶段以及随时空分布迁移等特点。同时,认为引起汶川地震震时和震后井孔-含水层系统水位异常的机理主要有两个:地震发生时映秀—北川断裂两侧岩体发生错动,引起沿岩体破裂方向(NE)断层附近含水层的地下水位发生显著的突变现象;地震波的传播作用引起云南一带地下水位发生振荡现象。

Abstract: Based on the regional tectonic stress of the Wenchuan Earthquake,the groundwater-level dynamic change of the deep borehole-aquifer system without the influence of water quantity is analyzed in this paper. The results show that during seismic gestation,occurrence and development,with the accumulation and release of rock stress-strain,the groundwater-level of the deep borehole-aquifer system can change significantly. The groundwater abnormal response arisen by seismic regional tectonic stress is v...