Abstract

Spatial distribution characteristics of subterranean hot water were indexed using correlation coefficient's (R) p-values for hot spring water quality indicators. For example, in a case where the p-value of R was smaller than 5%, the correlations of a set of water qualities for two hot springs were significant. In this study, in a dense hot spring area, the minimum distance with a p-value greater than Pc (critical p-value) was proposed as a stochastic and critical distance (Xc) for both new and existing hot spring owners. By using data from 10 hot springs in each area, 45 sets of distances and p-values were examined. Of the five areas examined, three and four Xcs more than 1,000m were found for Pc 1% and Pc 5%, respectively. The experimental relation between the given Xc and the hot spring depth could not be confirmed. Results indicate that the influence of water quality from new hot springs located outside of the Xc range is not always insignificant, even though the water quality of the new hot springs should primarily influence existing springs located within the Xc range.

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