Temporal variation in source location of continuous tremors before ash–gas emissions in January 2014 at Aso volcano, Japan

• 資料種別: 記事
• タイトル: Temporal variation in source location of continuous tremors before ash–gas emissions in January 2014 at Aso volcano, Japan
• 著者・編者: Misa Ichimura; Akihiko Yokoo; Tsuneomi Kagiyama
• 出版事項: 日本 : Springer Nature
• 出版年月日等: 2018-08-03
• 出版年（W3CDTF）: 2018-08-03
• タイトル（掲載誌）: EPS : Earth, Planets and Space
• 巻号年月日等（掲載誌）: 70(125)
• 掲載巻: 70(125)
• ISSN（掲載誌）: 1880-5981
• ISSN-L（掲載誌）: 1343-8832
• 本文の言語コード: eng
• DOI: 10.1186/s40623-018-0895-4; https://doi.org/10.1186/s40623-018-0895-4
• 国立国会図書館永続的識別子: info:ndljp/pid/11125893; https://dl.ndl.go.jp/pid/11125893
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• 受理日（W3CDTF）: 2018-08-10T20:26:03+09:00
• 保存日（W3CDTF）: 2018-08-10
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• 連携機関・データベース: 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp

• 要約等: Volcanic tremor is often observed to be associated with an increase in volcanic activity and during periods approaching eruptions. It is therefore of crucial importance to study this phenomenon. The opening of a new vent and subsequent ash–gas emissions was observed in the active crater (Nakadake crater) of Aso volcano, Japan, in January 2014. These events were considered to be associated with phreatomagmatic activity similar to the small events of 2003–2005. During the period from December 2013 to January 2014, a significant variation in the amplitude of continuous seismic tremors was observed corresponding to surficial volcanic activity. We estimated the tremor source locations for this two-month period by a three-dimensional grid search using the tremor amplitude ratio of 5–10 Hz band-pass filtered waveforms. The estimated source locations were distributed in a roughly cylindrical region (100–150 m in diameter) ranging from the ground surface to a depth of 400 m. Migration of the estimated source location was also identified and was associated with changes in volcanic activity. We assumed that the source locations coincided with a conduit system of the volcano, consisting of networks of fractures. This area is likely situated above the crack-like conduit proposed in previous studies. Before the 2014 event, an increase in gas-dominated volcanic fluid first caused an enlargement of the conduit zone, followed by the migration of further magmatic fluid through other pathways, which resulted in a subsequent ash–gas emission. Although we do not have sufficient information to discuss the causal relationship between these processes, it seems reasonable that continuous tremors might change the conduit conditions.
• DOI: 10.1186/s40623-018-0895-4; https://doi.org/10.1186/s40623-018-0895-4
• オンライン閲覧公開範囲: インターネット公開
• 著作権情報: © 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.
• 関連情報（URI）: http://hdl.handle.net/2433/234084; http://id.ndl.go.jp/digimeta/11125893; https://dl.ndl.go.jp/pid/11125893; http://link.springer.com/article/10.1186/s40623-018-0895-4/fulltext.html; http://link.springer.com/content/pdf/10.1186/s40623-018-0895-4.pdf
• 参照: Temporal variation in the resistivity structure of the first Nakadake crater, Aso volcano, Japan, during the magmatic eruptions from November 2014 to May 2015, as inferred by the ACTIVE electromagnetic monitoring system; https://cir.nii.ac.jp/crid/1050001338207908480; Estimating plume heights of explosive eruptions using high-frequency seismic amplitudes; https://cir.nii.ac.jp/crid/1050564289223207168; Magmatic–hydrothermal system of Aso Volcano, Japan, inferred from electrical resistivity structures; https://cir.nii.ac.jp/crid/1050869456405311104; Linking the flow-induced tremor model to the seismological observation: application to the deep harmonic tremor at Hakone volcano, Japan; https://cir.nii.ac.jp/crid/1360302864794060544; Temporal variation in the depth of the magma surface at Aso volcano in 2014–2015; https://cir.nii.ac.jp/crid/1360580229823040000; Heat transport process associated with the 2021 eruption of Aso volcano revealed by thermal and gas monitoring; https://cir.nii.ac.jp/crid/1360584340540818688; Magmatic processes associated with the 2020 eruption of Taal Volcano, Philippines, revealed by local seismic source estimates; https://cir.nii.ac.jp/crid/1360869854369203840; Amplitude Source Location Method With Depth‐Dependent Scattering and Attenuation Structures: Application at Nevado del Ruiz Volcano, Colombia; https://cir.nii.ac.jp/crid/1361131418080256384; Hydrothermal system of the active crater of Aso volcano (Japan) inferred from a three-dimensional resistivity structure model; https://cir.nii.ac.jp/crid/2050307417114050816; Temporal variations in discharge rate and component characteristics of tephra-fall deposits during the 2014–2015 eruption of Nakadake first crater, Aso Volcano, Japan; https://cir.nii.ac.jp/crid/2050588892090762752; Estimation of relative source locations from seismic amplitude : application to earthquakes and tremors at Meakandake volcano, eastern Hokkaido, Japan; https://cir.nii.ac.jp/crid/2051151842055369344
• 連携機関・データベース: 国立情報学研究所 : CiNii Research; https://cir.nii.ac.jp/
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• 書誌ID（NDLBibID）: 11125893; http://id.ndl.go.jp/bib/11125893
• NII論文ID: 120006502579