Search Results 1-20 of 53

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  • Integrated Study on Mitigation of Multimodal Disasters Caused by Ejection of Volcanic Products  [in Japanese]

    井口 正人 , 中道 治久 , 中田 節也 , 宮本 邦明 , 大石 哲 , 藤田 正治

    Volcanic eruptions produce many kinds of material, such as volcanic ash, pyroclastic flow and lava flows. … The volcanic products completely destroy their deposit area and volcanic ash is widely dispersed beyond borders of countries. …

    京都大学防災研究所年報. A = Disaster Prevention Research Institute Annuals. A 61(A), 5-23, 2018-09

    IR 

  • A sequence of a plinian eruption preceded by dome destruction at Kelud volcano, Indonesia, on February 13, 2014, revealed from tephra fallout and pyroclastic density current deposits

    Maeno Fukashi , Nakada Setsuya , Yoshimoto Mitsuhiro , Shimano Taketo , Hokanishi Natsumi , Zaennudin Akhmad , Iguchi Masato

    … A plinian-style eruption with a radially spreading umbrella cloud occurred on February 13, 2014, at Kelud volcano, Indonesia. … The declining phase of the eruption produced fine-rich fallout tephra layers (Unit D1–2) from low-level eruption plumes and/or ash lofted from PDCs. … We estimate a total erupted volume of 0.25–0.50 km3 (bulk deposit volume, 0.14–0.28 km3 in dense rock equivalent) and a mass eruption rate of 6.5 ± 2.8 × 107 kg/s, with a volcanic explosivity index of 4. …

    Journal of Volcanology and Geothermal Research, 2017-03-07

    IR 

  • Preliminary Results of Weather Radar Observations of Sakurajima Volcanic Smoke

    Maki Masayuki , Iguchi Masato , Maesaka Takeshi , Miwa Takahiro , Tanada Toshikazu , Kozono Tomofumi , Momotani Tatsuya , Yamaji Akihiko , Kakimoto Ikuya

    … <p>Preliminary results of quantitative analysis of volcanic ash clouds observed over the Sakurajima volcano in Kagoshima, Japan, were obtained by using weather radar and surface instruments. … The Ka-band Doppler radar observations showed the inner structure of a volcanic ash column every two minutes after an eruption. … Operational X-band polarimetric radar provides information on three-dimensional ash fall amount distribution. …

    Journal of Disaster Research 11(1), 15-30, 2016

    J-STAGE 

  • Numerical Simulations of Volcanic Ash Plume Dispersal from Kelud Volcano in Indonesia on February 13, 2014

    Tanaka Hiroshi L. , Iguchi Masato , Nakada Setsuya

    … <p>In order to evaluate airborne ash densities, a real-time volcanic ash dispersion model, PUFF, is applied to the February 13, 2014 eruption of Kelud volcano in Indonesia. …

    Journal of Disaster Research 11(1), 31-42, 2016

    J-STAGE 

  • Tephra Transport:Modeling and Forecasting  [in Japanese]

    SHIMBORI Toshiki

    … The processes consist of advection, diffusion, gravitational fallout, dry deposition, wet scavenging, aggregation, resuspension and so on, which are taken into the operational models of Volcanic Ash Advisories and Volcanic Ash Fall Forecasts in the world. …

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 61(2), 399-427, 2016

    J-STAGE 

  • An Introduction to Himawari-8/9— Japan’s New-Generation Geostationary Meteorological Satellites

    BESSHO Kotaro , OHNO Tomoo , OKUYAMA Arata , OYAMA Ryo , SASAKI Yukio , SHIMAZU Yoshio , SHIMOJI Kazuki , SUMIDA Yasuhiko , SUZUKI Masuo , TANIGUCHI Hidetaka , TSUCHIYAMA Hiroaki , DATE Kenji , UESAWA Daisaku , YOKOTA Hironobu , YOSHIDA Ryo , HAYASHI Masahiro , IKEDA Akio , IMAI Takahito , INOUE Hidekazu , KUMAGAI Yukihiro , MIYAKAWA Takuya , MURATA Hidehiko

    … For example, fundamental cloud product is retrieved from observation data of Himawari-8 operationally. … Based on the fundamental cloud product, Clear Sky Radiance and Atmospheric Motion Vector are processed for numerical weather prediction, and volcanic ash product and Aeolian dust product are created for disaster watching and environmental monitoring. …

    Journal of the Meteorological Society of Japan. Ser. II 94(2), 151-183, 2016

    J-STAGE 

  • Efforts to Prevent Aircraft Accidents by Volcanic Eruption and Airborne Measurement of Ash Concentration  [in Japanese]

    YOSHITANI Junichi , YASUDA Nario , ELÍASSON Jónas , MIKI Daisuke , IGUCHI Masato

    … <b>Abstract</b> Volcanic ash clouds potentially cause damage to aircraft engines. … Especially, glassy materials contained in volcanic ash could cause a serious damage. … After the 1970s, incidents of ash-related aircraft damage rapidly increased. …

    Earozoru Kenkyu 30(3), 161-167, 2015

    J-STAGE 

  • Multiphase Flows in Volcanic Eruption:(Numerical Simulations of Volcanic Eruption Cloud)

    SUZUKI Yujiro

    … Explosive volcanic eruption is one of the most hazardous natural phenomena. … During explosive eruptions, a mixture of volcanic ash and gases is ejected from a volcanic vent into the atmosphere. … For hazard risk assessment, it is important to comprehensively explain various observed data during eruptions and to understand the dynamics of explosive eruptions and the mechanism of volcanic ash dispersal. …

    JAPANESE JOURNAL OF MULTIPHASE FLOW 29(2), 106-113, 2015

    J-STAGE 

  • P76 Evaluation of Detection Capability of Volcanic Ash Cloud by JMA Weather Radars  [in Japanese]

    SATO Eiichi , FUKUI Keiichi , SHIMBORI Toshiki , ISHII Kensuke , TAKAGI Akimichi , MAKI Masayuki , SUGAI Akira , KUROKI Hidekuni

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2015(0), 174, 2015

    J-STAGE 

  • 3D Numerical Simulations of Eruption Cloud Dynamics and Tephra Dispersal

    鈴木 雄治郎 , 小屋口 剛博

    Annual report of the Earth Simulator Center, 95-100, 2014-04

  • Tephra Fall Predictions with the JMA Regional Atmospheric Transport Model: A Case Study of the Eruptions at Shinmoe-dake Volcano in 2011

    Shimbori Toshiki , Fukui Keiichi , Kai Reiko , Hayashi Yosuke , Hayashi Yuta , Sugai Akira , Hasegawa Yoshihiko , Hashimoto Akihiro , Takagi Akimichi , Yamamoto Tetsuya

    気象庁の降灰予報で運用している領域移流拡散モデル(JMA-RATM、旧称「火山灰移流拡散モデル」)の改良を行った。(i)初期値の噴煙柱モデルに気象レーダーによる噴煙エコー頂高度の時間変化を利用、(ii)入力値に非静力学モデル(JMA-NHM)である水平格子間隔2 km、鉛直60層(モデルトップ20.2 km)の局地モデル(LFM)を対応、(iii)カニンガム補正した鈴木の落下速度、レインアウト、雨 …

    Papers in Meteorology and Geophysics 65(0), 75-107, 2014

    J-STAGE 

  • Airborne Measurements of Volcanic Ash and Current State of Ash Cloud Prediction

    ELIASSON Jonas , YOSHITANI Junichi

    … Eyjafjallajökull 2010 and Grímsvötn 2011 eruptions created great problems for commercial aviation in the North Atlantic because of the large extent of the predicted ash clouds from these eruptions. … Comparison to satellite pictures showed the predictions very much larger than the ash cloud. … Measurements also showed lower ash concentrations over Europe than the predicted. …

    京都大学防災研究所年報 (58), 35-41, 2014

    IR 

  • Weather Radar Observations of Sakurajima Volcanic Smoke  [in Japanese]

    真木 雅之 , 井口 正人 , 藤田 英輔 [他] , 三輪 学央 , 前坂 剛 , 出世 ゆかり , 小園 誠史 , 桃谷 哲也 , 山路 昭彦

    … Corresponding to volcano activities, the ash accumulation in Kagoshima city increased and total ash amount of 3, 500g m-2 was recorded at Kagoshima local meteorological observatory. … Because the volume of volcanic ash in rural area paralyze public ground transportations such as rail road and highway, fast recovery efforts are required to the railroad company and city government. …

    京都大学防災研究所年報 (58), 76-85, 2014

    IR 

  • Experimental Measurement on Falling Velocity of Volcanic Ash from Sakurajima Volcano by Using PARSIVEL Disdrometer  [in Japanese]

    三輪 学央 , 真木 雅之 , 小園 誠史 [他] , 藤田 英輔 , 棚田 俊收 , 井口 正人

    … We performed large scale experiment to measure the falling velocity of volcanic material from Sakurajima volcano by using PARSIVEL. … Volcanic materials from Sakurajima volcano were fallen from 16 m of height, and their size and falling velocity were measured by the PARSIVEL. …

    京都大学防災研究所年報 (58), 91-94, 2014

    IR 

  • A study on detection of volcanic cloud of the SAKURAJIMA volcano by X-band MP radar observation  [in Japanese]

    SAKAI Toshiyuki , MOMOTANI Tatsuya , TERATANI Takuji , TSUJIMOTO Hirofumi , KUNITOMO Masaru , TAKAHASHI Eiichi , SHIMOKUBO Kazuhiro , ASO Syuichi

    … It is therefore necessary that the Ministry of Land, Infrastructure, Transport and Tourism makes further enhancement of observation monitoring system so as to understand rainfall and ash fall situation over in particular active volcanoes promptly and accurately. …

    Journal of the Japan Society of Erosion Control Engineering 66(3), 45-50, 2013

    J-STAGE 

  • Amounts of Tephra Fall Deposits from Shinmoedake Volcano, Kirishima Volcanoes, during March 2011-Febrary 2012 : A Preliminary Study for Immediate Estimation of the Eruptive Mass  [in Japanese]

    NISHIKI Kuniaki , OIKAWA Teruki , FURUKAWA Ryuta , OISHI Masayuki , NAKANO Shun , MIYAGI Isoji

    … Sub-plinian eruptions occurred on 26-27 January, followed by vulcanian eruptions and eruptions of ash fall thereafter. … Here, we report the results of a preliminary study that sought to estimate the eruptive mass and the distribution of ash fall based on observations of tephra fall within 2 weeks of an eruption at Shinmoedake. …

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 58(2), 353-363, 2013

    J-STAGE 

  • A computational fluid dynamics simulation of an eruption column for evaluation of volcanic ash-fall (Part 1) Effects of turbulence models on eruption cloud shape  [in Japanese]

    須藤 仁 , 服部 康男 , 土志田 潔

    電力中央研究所報告. 研究報告. 電力中央研究所地球工学研究所 編 (12003), 1-23,巻頭1-3, 2012-08

  • Eruption of Mt. Shinmoedake in Kirishima Volcanoes and crisis management  [in Japanese]

    木下 紀正

    Journal of Japanese scientists 46(7), 1120-1126, 2011-07

  • Considerations on comprehensive risk assessment and mitigation planning of volcanic ash-fall  [in Japanese]

    土志田 潔

    電力中央研究所報告 研究報告 (09031), 1-25,巻頭1〜3, 2010-05

  • Quantitative Tephra Fall Prediction with the JMA Mesoscale Tracer Transport Model for Volcanic Ash: A Case Study of the Eruption at Asama Volcano in 2009  [in Japanese]

    Shimbori Toshiki , Aikawa Yuri , Fukui Keiichi , Hashimoto Akihiro , Seino Naoko , Yamasato Hitoshi

       気象庁では、火山現象予報の一つとして、2008年3月31日から降灰予報の業務を開始した。この論文では、降灰予報を高度化するために気象庁・気象研究所で開発している降灰予測システムを用いて、降灰量の量的予測を行う方法について論じる。降灰予測の方法は、まず初期値となる噴煙柱モデルを、仮想質量をもつ火山灰トレーサーで構成する。次に、トレーサーの時間発展を移流拡散モデルに …

    Papers in Meteorology and Geophysics (61), 13-29, 2010

    J-STAGE 

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