关键词: 地下水位异常, 唐山地震, 动态图象, 演化模式

Abstract: We have studied the method of dynamic pattern generation,the characteristics of time space evolution of sliding variation extent of groundwater level and its mode of formation and evloution before and after the Tangshan earthquake of 1976. The results show that the positive and negative areas and anomaly characteristic area of the sliding variation extent of groundwater level present the distinct features of stage and regularity before and after the Tangshan earthquake. The negative area has the feature of“contraction-extention-quick extention-occurrence of earthquake”. The anomaly characteristic area displays the feature of“migation form periphery to epicentre-extention-stabilization-earthquake occurring-disappear”. The sliding variation extent of groundwater level in the anomaly characteristic area presents the feature of“increase-discrease-earthquake occurring-quick discrease”. We have also analyzed the dynamic pattern of sliding variation extent of groundwater level related to tectonic deformation,fault movement and active mantle uplift. Finally,we propose a“field-region-epicentre”evolution mode of dynamic pattern of sliding variation extent of groundwater level before and after the Tangshan earthquake.

Key words: Groundwater level anomaly, Tangshan earthquake, Dynamic pattern, Evolution mode