Lahar characteristics as a function of triggering mechanism at a seasonally snow-clad volcano : contrasting lahars following the 2014 phreatic eruption of Ontake Volcano, Japan
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- Material Type
- 記事
- Author/Editor
- Kyoko S. KataokaTakane MatsumotoTakeshi Saito
- Publication, Distribution, etc.
- Publication Date
- 2018-07-05
- Publication Date (W3CDTF)
- 2018-07-05
- Periodical title
- EPS : Earth, Planets and Space
- No. or year of volume/issue
- 70(113)
- Volume
- 70(113)
- ISSN (Periodical Title)
- 1880-5981
- ISSN-L (Periodical Title)
- 1343-8832
- Text Language Code
- eng
- DOI
- 10.1186/s40623-018-0873-x
- Persistent ID (NDL)
- info:ndljp/pid/11125881
- Collection
- Collection (Materials For Handicapped People:1)
- Collection (particular)
- 国立国会図書館デジタルコレクション > 電子書籍・電子雑誌 > その他
- Acquisition Basis
- オンライン資料収集制度
- Date Accepted (W3CDTF)
- 2018-08-10T20:26:03+09:00
- Date Captured (W3CDTF)
- 2018-08-10
- Format (IMT)
- application/pdf
- Access Restrictions
- 国立国会図書館内限定公開
- Service for the Digitized Contents Transmission Service
- 図書館・個人送信対象外
- Availability of remote photoduplication service
- 可
- Periodical Title (URI)
- Periodical Title (Persistent ID (NDL))
- info:ndljp/pid/11067456
- Data Provider (Database)
- 国立国会図書館 : 国立国会図書館デジタルコレクション
- Summary, etc.
- In association with the September 2014 phreatic eruption (VEI 1–2) at Ontake Volcano, a syn-eruptive and two post-eruptive lahars occurred in the Akagawa–Nigorigawa River, southern flank of the volcano. The present contribution describes and discusses the contrasting features of the two post-eruptive lahars, which caused a major impact on downstream river morphology, and re-examines the description of the syn-eruptive lahar in the previous study. The first post-eruptive lahar occurred 8 days after the eruption by the rainstorm (October 5, 2014, before the snowy season), and the second lahar was associated with the rain-on-snow (ROS) event on April 20, 2015, in the early spring of the snowmelt season. The October rain-triggered lahar, which can be interpreted as a cohesive debris flow, reached at least ~ 11 km downstream and left muddy matrix-rich sediments with high clay content (10–20 wt% of clay in matrix). The lahar deposits contain hydrothermally altered rock fragments, sulfide/sulfate minerals, and clay minerals and show extremely high total sulfur content (10–14 wt%) in matrix part, indicating source material from the September phreatic eruption deposits. The presence of “rain-triggered” clay-rich lahar and deposits originating from a single small phreatic eruption is important because usually such clay-rich lahars are known to occur in association with large-scale sector collapse and debris avalanches. The April ROS-triggered lahar was caused by the heavy rain and accompanying snow melting. The lahar was dilute and partly erosional and evolved into hyperconcentrated flow, which left fines-depleted sandy and gravelly deposits. Despite these lahars that originated from the same volcanic source and occurring within a 7-month period, the flow and resulting depositional characteristics are totally different. These different types of lahars after a single eruptive event need different simulations and mitigation of lahar hazards with timing (season) of the lahar onset. In comparison with rainfall intensity, snow-melting rate, and the contrasting lahars occurred in 2014/2015, it is postulated that the generation, size, and types of lahars can vary with the timing of eruption, whether it happens during the pre-snow season, snow season, or rainy season.
- DOI
- 10.1186/s40623-018-0873-x
- Access Restrictions
- インターネット公開
- Rights (production)
- © The Author(s) 2018. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
- Related Material (URI)
- Is Referenced By
- Temporal changes in lahar sediment run‐off characteristics and run‐off coefficients in the Arimura River basin of Sakurajima volcano, JapanFrom sink to volcanic source: Unravelling missing terrestrial eruption records by characterization and high‐resolution chronology of lacustrine volcanic density flow deposits, Lake Inawashiro‐ko, Fukushima, JapanLahar record during the last 2500 years, Chokai Volcano, northeast Japan: Flow behavior, sourced volcanic activity, and hazard implications“Volcanism in the Chugoku region: a review for the first UNESCO field school on Geoenvironmental disaster reduction”Lahar deposits along the Nigorikawa River in the eastern foot of Zao Volcano, Japan, during the last 8000 yearsFrom ‘source to sink’ to ‘sink to source’: a review of volcanic fluvial and lacustrine successions in Japan水蒸気噴火の発生場と噴火過程の観測現行堆積作用・堆積物研究の地質学への展開：Crisis hazard assessment for snow-related lahars from an unforeseen new vent eruption : the 2018 eruption of Kusatsu-Shirane volcano, JapanSuspended sediment transport diversity in river catchments following the 2014 phreatic eruption at Ontake Volcano, Japan
- References
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- 国立情報学研究所 : CiNii Research
- Original Data Provider (Database)
- 学術機関リポジトリデータベース雑誌記事索引データベースCrossrefCiNii Articles科学研究費助成事業データベース科学研究費助成事業データベース科学研究費助成事業データベースCrossrefCrossrefCrossrefCrossrefCrossrefCrossrefCrossrefCrossrefCrossrefCrossref
- Bibliographic ID (NDL)
- 11125881
- NAID
- 120006529716