研究報告B 09.2.21 0:47 AM ページ9 九大理研報(地球惑星) ,22巻 3 号,9−22頁,2009年3月 9 雲仙火山1991年6月3日の火砕流による人的被害 杉本伸一*・長井大輔** Casualties by the 3 June 1991 pyroclastic flow at Unzen volcano Shinichi SUGIMOTO* and Daisuke NAGAI** Abstract The 1990-1995 eruption of Unzen volcano, Japan, was characterized by lava dome growth and pyroclastic flows triggered by dome collapse. One of the largest pyroclastic flows occurred