Journal of Disaster Research
Online ISSN : 1883-8030
Print ISSN : 1881-2473
ISSN-L : 1881-2473
Regular Papers
Air-Fall Ash from the Main Crater of Asama Volcano on August 7, 2019, and its Water-Soluble Components
Muga YaguchiAkihiko TeradaYasuo Ogawa
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ジャーナル オープンアクセス

2020 年 15 巻 1 号 p. 53-56

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We collected volcanic ash immediately following the eruption of Mt. Asama on August 7, 2019, observed the characteristics of ash particles, and analyzed the water-soluble components. The volcanic ash consisted mostly of altered fragments, and no clear evidence of essential materials was found. The volcanic ash contained large amounts of water-soluble components, Cl and SO4 at concentrations of 8,710 mg/kg and 49,100 mg/kg, respectively. These results indicate that this eruption was caused by the phreatic explosion and that part of the volcanic edifice of Mt. Asama was fractured and emitted.

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