1984年5月21日南黄海河豚沙发生6.2级地震。此后,发生了一系列余震,最大余震4.9级。本文拟对这次地震前后,江苏省水化学的异常情况作一初步的分析。我们统计了离震中350公里以内的水化点共19个井孔,其观测项目有水氡、氯离子、钙离子、镁离子、水温、流量等。这些井孔工作正常,资料连续,井孔分布(图1)。 On May 21, 1984, a 6.2 magnitude earthquake occurred in the puffer fish sand of the South Yellow Sea. Since then, a series of aftershocks occurred, the maximum aftershock 4.9. This article intends to make a preliminary analysis on the anomalies of water chemistry in Jiangsu Province before and after the earthquake. We counted a total of 19 wellbores at the hydration point within 350 km from the epicenter. The observation items include water radon, chloride ion, calcium ion, magnesium ion, water temperature and flow rate. These wells are working properly with continuous data and wellbore distribution (Figure 1).