YAMADA Hiroyuki
,
TATEYAMA Kohei
,
HONDA Ryo
,
YOSHIMOTO Mitsuhiro
,
FUJII Toshitsugu
… <p>Many casualties have been caused by the collision of lapilli and blocks ejecta (ballistic ejecta) following the phreatic eruptions of Mt. Ontake in September 2014 and Mt. Moto-Shirane, which is the southern part of Kusatsu-Shirane volcano, in January 2018 in Japan. …
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