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  1. 防災科研関係論文

The October 16, 2013 rainfall-induced landslides and associated lahars at Izu Oshima Volcano, Japan

https://nied-repo.bosai.go.jp/records/4330
https://nied-repo.bosai.go.jp/records/4330
72e97402-aa79-44fa-ab1e-15e242ef6981
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル The October 16, 2013 rainfall-induced landslides and associated lahars at Izu Oshima Volcano, Japan
言語
言語 eng
著者 Yasuo Miyabuchi

× Yasuo Miyabuchi

en Yasuo Miyabuchi

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Fukashi Maeno

× Fukashi Maeno

en Fukashi Maeno

Search repository
Setsuya Nakada

× Setsuya Nakada

en Setsuya Nakada

Search repository
抄録
内容記述タイプ Other
内容記述 Intense rainfall related to the typhoon T1326 on October 15-16,2013 (total 824 mm; maximum hourly rainfall 118.5 mm) triggered numerous landslides and associated lahars at Izu Oshima Volcano, the northernmost part of Izu Mariana volcanic arc, Japan. The landslides were concentrated mainly in a 2-km(2) area located on the western slope of Izu Oshima Volcano. Most of the landslides were shallow soil slips (<2 m thick) in unconsolidated fallout tephra layers overlying lava flows and pyroclastic rocks. The rupture surfaces of them were located near the base of Y1 tephra (AD 1777-1778) and/or the base of Y4 tephra (AD 1421). The Y1 and Y4 tephras differ from the underlying paleosols in permeability, grain size and degree of compaction. The saturated hydraulic conductivities of the paleosols were one to two orders of magnitude smaller than those of the overlying Y1 and Y4 tephras. Most landslides mobilized completely into lahars, traveling along stream channels or flat slopes and flooding at the foot of the volcano. The associated lahars severely damaged inhabited areas and caused thirty five fatalities. Although the lahars eroded slopes and transported boulders up to 1 m in diameter and a large amount of woody debris, they contained more than 90% of sand-to-silt-size particles, similar in composition to the original sliding materials. Sediment discharge volumes from three basins were estimated at 1.8-4.1 x 10(4) m(3)/km(2), based on debris volumes trapped by sediment retention dams. The characteristics of rainfall-induced landslides and associated lahars at Izu Oshima Volcano in 2013 provide an important lesson about future non-eruption-related landslide and lahar hazards at tephra-rich volcanoes. (C) 2015 Elsevier B.V. All rights reserved.
言語 en
書誌情報 en : JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH

巻 302, p. 242-256
出版者
言語 en
出版者 ELSEVIER SCIENCE BV
ISSN
収録物識別子タイプ EISSN
収録物識別子 1872-6097
DOI
関連識別子 10.1016/j.jvolgeores.2015.07.012
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