Science. 1995 Jul 7;269(5220):61-3. doi: 10.1126/science.269.5220.61.
Chloride (Cl(-)) and sulfate (SO(4)(2-)) ion concentrations of ground water issuing from two wells located near the epicenter of the Kobe earthquake in Japan fluctuated before the disastrous magnitude 7.2 event on 17 January 1995. The samples measured were pumped ground water packed in bottles and distributed in the domestic market as drinking water from 1993 to April 1995. Analytical results demonstrate that Cl(-)and SO(4)(2-) concentrations increased steadily from August 1994 to just before the earthquake. Water sampled after the earthquake showed much higher Cl(-) and SO(4)(2-) concentrations. The precursory changes in chemical composition may reflect the preparation stage of a large earthquake.
来自日本神户地震震中附近两口井的地下水的氯（Cl(-)）和硫酸盐（SO(4)(2-)）离子浓度在 1995 年 1 月 17 日灾难性的 7.2 级地震之前发生波动。这些水样是从 1993 年到 1995 年 4 月期间，以瓶装形式抽取并在国内市场作为饮用水销售的地下水。分析结果表明，从 1994 年 8 月到地震前，Cl(-)和 SO(4)(2-)浓度稳步上升。地震后的水样中 Cl(-)和 SO(4)(2-)浓度明显更高。化学成分的这种前兆变化可能反映了大地震的准备阶段。
