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Temporal variations of Sr isotopes and lithophile element compositions of Kobe groundwater before and after the 1995 Kobe earthquake



Temporal variations of Sr isotopes and lithophile element compositions of Kobe groundwater before and after the 1995 Kobe earthquake



Chikyukagaku (Tokyo 1967) = Geochemistry (Tokyo



In order to investigate the chemical variations before and after the 1995 Kobe earthquake, 59 water samples from three commercial and one domestic wells in Kobe City were analyzed for (super 87) Sr/ (super 86) Sr isotopic ratio and concentrations of lithophile elements (Mg, Ca, Sr, Ba and U). First, we examined the influences of collection and treatment processes on chemical compositions of commercial water. We assumed that original changes of chemical features were preserved for the water samples from two of the four wells studied. Concentrations of dissolved ions in water from a well (M) appeared monotonously decreasing for 15 months before and after the Kobe earthquake. During this period, the (super 87) Sr/ (super 86) Sr isotopic ratio and concentration ratios of lithophile elements were kept substantially constant. Then anomalies of chemical and isotopic compositions occurred after 9 months of the earthquake. Another well (S) shows the marked anomaly of (super 87) Sr/ (super 86) Sr isotopic ratio along with the change of chemical compositions just 3 days before the Kobe earthquake. Geochemical changes of dissolved metallic species, particularly Sr isotopes in groundwater may provide significant informations to understand the local changes of hydrological circumstances associated with the Kobe earthquake.

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Accession: 023768224

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