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Title
Japanese:Total mass estimate of the January 23, 2018, phreatic eruption of Kusatsu-Shirane Volcano, central Japan 
English:Total mass estimate of the January 23, 2018, phreatic eruption of Kusatsu-Shirane Volcano, central Japan 
Author
Japanese: Nobuko Kametani, Yasuo Ishizaki, Mittsuhiro Yoshimoto, Fukashi Maeno, 寺田 暁彦, Ryuta Furukawa, Ryo Honda, Yoshihiro Ishizuka, Jiro Komori, Masashi Nagai, Shinji Takarada.  
English: Nobuko Kametani, Yasuo Ishizaki, Mittsuhiro Yoshimoto, Fukashi Maeno, Akihiko Terada, Ryuta Furukawa, Ryo Honda, Yoshihiro Ishizuka, Jiro Komori, Masashi Nagai, Shinji Takarada.  
Language English 
Journal/Book name
Japanese:Earth, Planets and Space 
English:Earth, Planets and Space 
Volume, Number, Page Vol. 73    No. 1   
Published date July 2021 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL http://dx.doi.org/10.1186/s40623-021-01468-3
 
DOI https://doi.org/10.1186/s40623-021-01468-3
Abstract <jats:title>Abstract</jats:title><jats:p>On January 23, 2018, a small phreatic eruption (VEI = 1) occurred at the Motoshirane Pyroclastic Cone Group in the southern part of Kusatsu-Shirane Volcano in central Japan. The eruption ejected ash, lapillus, and volcanic blocks from three newly opened craters: the main crater (MC), west crater (WC), and south crater (SC). Volcanic blocks were deposited up to 0.5 km from each crater. In contrast, the ash released during this eruption fell up to 25 km ENE of the volcano. The total mass of the fall deposit generated by the eruption was estimated using two methods, yielding total masses of 3.4 × 10<jats:sup>4</jats:sup> t (segment integration method) and 2.4 × 10<jats:sup>4</jats:sup> t (Weibull fitting method). The calculations indicate that approximately 70% of the fall deposit was located within 0.5 km of the craters, which was mainly attributed to the low height of the eruption plume.</jats:p>

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