2024-03-29T11:21:02Z
https://repository.dl.itc.u-tokyo.ac.jp/oai
oai:repository.dl.itc.u-tokyo.ac.jp:00033921
2022-12-19T04:09:11Z
80:4535:5017:5021
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Size Characteristict of the Pumice Deposits distributed in the Vicinity of Komoro on the Southwest Foot of Asama Volcano
小諸附近に分布する浅間火山軽石の粒度組成
津屋, 弘逵
132290
村井, 勇
132291
細谷, 与七
132292
453
application/pdf
小諸附近の浅間火山軽石の粗度組成は,分級の悪いこと,粗粒部及び細粒部に長く尾を引くこと,粗変の変化が分布の全範囲にわたつてほとんど認められないこと,等の点で,降下軽石の粒変組成とは全く異つている.概してCrater Lake地域の""Older Pumice""の粒変組成に見られるような特徴を示しているが,しかし""Older Pumice""ほど分級は悪くなく,又それほど多量の大粒径の軽石を含んではいない.このような粒度組成の特徴と,分布状態とから判断して,典型的な降下軽石とは堆積の機構が全く異るものと見られる.おそらくは火山砕屑流の状態で山腹を流下して堆積したものであろうと考えられる.
The phenomena of nuees ardentes or burning clouds have attracted much attension by volcanologists since the eruption of Mount Pelee in 1902, inducing some of them to do a detailed study of pyroclastic deposits, especially of nuees ardentes deposits. Among those, Fenner (1923) studied the origin of the tuff deposits in the Valley of Ten Thousand Smokes, Katmai. MOORE (1934) described the recent pumice deposits of the Crater Lake region and discussed their origin. He concluded that, judged from the size characteristics and other features, one of them, the ""Older Pumice"", is apparently different in origin from the pumice deposits of the normal projected type, being regarded as a product of nuees ardentes. Recently, in Japan, products of nuees ardentes or of pyroclastic flows have been reported from several volcanic regions. TANEDA (1954) studied the ""Shirasu"" in Southern Kyushu and concluded that it may be regarded as the nuees ardentes products showing size characteristics similar to those of the ""Older Pumice"" of the Crater Lake region.
departmental bulletin paper
東京大学地震研究所
1958-10-31
application/pdf
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo
3
36
413
431
AN00162258
00408972
https://repository.dl.itc.u-tokyo.ac.jp/record/33921/files/ji0363010.pdf
jpn