通过水文地球化学(地下水中SO_$~=、Cl~-、Ca~(++)、Mg~(++))资料的积累,表明许多井点在海城7.3级与唐山7.8级大震前水化学成分是有反应的。 在此基础上,对震前水浑过程Mg~(++)的升高以及爆破实验的研究,探讨了水文地球化学变化的机制。认为震前水文地球化学的变化,除深层物质上涌外,多数是含水层及其围岩受应力作用产生应变的过程中发生的。 The accumulation of data of hydrogeochemistry (SO_ $ ~ =, Cl ~ -, Ca ~ (++), Mg ~ (++)) in groundwater shows that many well points The chemical composition of water is reactive. On this basis, the study on the rise of Mg ~ (++) and the experiment of blasting before the water-muddy process before earthquake, and the mechanism of hydrogeochemical change are discussed. It is considered that the change of hydrogeochemistry before the earthquake occurred in addition to the upwelling of the deep material and that most of the aquifers and their surrounding rocks are under the strain caused by the stress.