Validation analysis of volcanic calamities from Mt. Ontake-san and pH fluctuations in the Ootaki-gawa River system, Nagano Prefecture, Central Japan, and its effects on local communities
Abstract:In this study, natural calamities arising from the Mt. Ontake-san volcano and fluctuations in the pH values in the Ootaki-gawa River system, Nagano Prefecture, Central Japan, are investigated based on various reports by researchers, local governments, residents, and anglers. During the last 50 years, Mt. Ontake-san erupted twice, in 1979 and 2014, and an earthquake in 1984 caused a large-scale landslide. These events may have affected local river water quality, aquatic biota, and the livelihood of residents wh… Show more
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