Influence of the 2016 Kumamoto earthquake on groundwater quality

Q4 Environmental Science

Japanese Journal of Limnology Pub Date : 2018-09-25 DOI:10.3739/rikusui.79.147

Y. Kawagoshi, H. Koga, Y. Suenaga, T. Hama, Hiroaki Ito

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引用次数: 5

Abstract

We investigated the influence of the 2016 Kumamoto earthquake on groundwater quality at 12 sampling points in the area near its seismic centre. We statistically evaluated the difference in the measured values of each waterquality index before and after the earthquake based on bi-weekly or monthly monitoring data for three years across the earthquake area. We also visualised water-quality characteristics using a hexa-diagram (Stiff diagram) and statistically evaluated differences before and after the earthquake using non-hierarchical cluster analysis. The results showed that there was not a large variation in water-quality characteristics as represented by the hexa-diagram shape. However, statistical analysis showed a significant difference at nine sampling points, suggesting earthquake influence on groundwater quality. In addition, it is possible that the influence of the earthquake appeared later in a groundwater-discharge area. On the other hand, no topographic relationship between the location of the sampling points and seismic centre or the fault was shown; thus, it is likely that groundwater quality varied at arbitrary points within the study area where slip on the fault was observed.

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2016年熊本地震对地下水水质的影响

我们调查了2016年熊本地震对地震中心附近地区12个采样点地下水质量的影响。我们根据震区三年的每两周或每月一次的监测数据，统计评估了地震前后每个水质指标的测量值的差异。我们还使用六角图（Stiff图）可视化了水质特征，并使用非层次聚类分析对地震前后的差异进行了统计评估。结果表明，以六面图形状表示的水质特征变化不大。然而，统计分析显示，在9个采样点存在显著差异，表明地震对地下水质量的影响。此外，地震的影响可能出现在地下水排泄区的晚些时候。另一方面，没有显示采样点的位置与地震中心或断层之间的地形关系；因此，地下水质量可能在研究区域内观察到断层滑动的任意点发生变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Japanese Journal of Limnology Environmental Science-Ecology

CiteScore

0.20

自引率

0.00%

发文量

期刊介绍： The Japanese Society of Limnology was founded in 1931 for the purpose of promoting and fostering the study of limnology in the broad meaning of the term. It publishes quarterly "The Japanese Journal of Limnology" and holds an annual meeting consisting of lectures, discussions and symposiums on limnological subjects.