Open AccessAir-Fall Ash from the Main Crater of Asama Volcano on August 7, 2019, and its Water-Soluble Components
Author(s) -
Muga Yaguchi,
Akira Terada,
Yasuo Ogawa
Publication year - 2020
Publication title -
journal of disaster research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.332
H-Index - 18
eISSN - 1883-8030
pISSN - 1881-2473
DOI - 10.20965/jdr.2020.p0053
Subject(s) - volcano , phreatic eruption , impact crater , volcanic ash , phreatic , geology , fumarole , crater lake , geochemistry , seismology , mineralogy , magma , groundwater , geotechnical engineering , astrobiology , aquifer , physics
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 SO 4 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.