地球化学
Online ISSN : 2188-5923
Print ISSN : 0386-4073
ISSN-L : 0386-4073
地震
淡路島の異常湧水の化学組成変化 –1995年兵庫県南部地震による影響–
佐藤 努高橋 誠
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ジャーナル フリー

1997 年 31 巻 2 号 p. 89-98

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Discharge rates of many springs in Awaji Island increased markedly just after the 1995 Kobe earthquake. For the following one year, the discharge rates at the six springs had gradually decreased to less than 50% of the rates measured in May 1995. On the other hand, major chemical composition did not change except for one spring located in Nojima-ezaki, the northern end of the island. The change in Nojima-ezaki is a long term fluctuation of anion composition. The concentration of bicarbonate ion decreased gradually, and the concentration of nitrate ion increased simultaneously. In Awaji Island, bicarbonate and nitrate ions characterize deep and shallow groundwaters, respectively. Therefore, the observed geochemical fluctuation is thought to be caused by a change of mixing ratio of groundwaters at different depths.
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© 1997 日本地球化学会
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