Author:
Kametani Nobuko,Ishizaki Yasuo,Yoshimoto Mitsuhiro,Maeno Fukashi,Terada Akihiko,Furukawa Ryuta,Honda Ryo,Ishizuka Yoshihiro,Komori Jiro,Nagai Masashi,Takarada Shinji
Abstract
AbstractOn 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 × 104 t (segment integration method) and 2.4 × 104 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.
Funder
Grant-in-Aid for scientific research
Publisher
Springer Science and Business Media LLC
Subject
Space and Planetary Science,Geology
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