Search Results 1-20 of 172

  • Visualized Information of Himawari-8 Satellite Observation on Occurrence of Meteorological Phenomena Leading to Aircraft Operational Constraints  [in Japanese]

    TEZUKA Asei

    … In this paper, as for the meteorological phenomena that lead to aircraft operational constraints, the cases of typhoons, thunderstorms, fog and volcanic plume have examined. …

    AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 19(0), 159-164, 2020

    J-STAGE 

  • Fluorine and Chlorine Contents of Volcanic Ash from the 2004 Eruption of Asama Volcano, Japan

    NOGAMI Kenji , ONIZAWA Shin'ya

    <p>日本列島の本州のほぼ中央部に位置する浅間山は,2004年9月1日に約20年ぶりに噴火した.この噴火活動は約4ヶ月続き,水蒸気爆発と噴煙活動(Phase I),BH型地震の群発を伴う非爆発的マグマ噴火(Phase II)を経て爆発的噴火(Phase III)へと短期間に噴火様式が移行した.Phase I,Phase II,Phase IIIで放出された火山灰中のフッ素及び塩素濃度を …

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 65(1), 1-12, 2020

    J-STAGE 

  • Stable hydrogen and oxygen isotopic compositions of water vapor in volcanic plumes sampled in glass bottles using cavity ring-down spectroscopy

    Takahashi Koji U. , Tsunogai Urumu , Nakagawa Fumiko , Sukigara Chiho

    … The isotopic compositions (δ^2H and δ^18O) of fumarolic H2O emitted during volcanic eruptions can distinguish the type of eruption (magmatic or phreatic), but direct sampling of fumarolic H2O in eruptive volcanoes is often neither practical nor safe. … In this study, we developed a new analytical system to safely determine the isotopic compositions of fumarolic H2O from the volcanic plume samples taken in glass bottles. …

    Journal of Volcanology and Geothermal Research (384), 232-240, 2019-10

    IR 

  • Transition from Plume-driven to Plate-driven Magmatism in the Evolution of the Main Ethiopian Rift

    Feyissa Dejene Hailemariam , Kitagawa Hiroshi , Bizuneh Tesfaye Demissie , Tanaka Ryoji , Kabeto Kurkura , Nakamura Eizo

    … New K-Ar ages, major and trace element concentrations, and Sr-Nd-Pb isotope data are presented for Oligocene to recent mafic volcanic rocks from the Ethiopian Plateau, the Main Ethiopian Rift (MER), and the Afar depression. … Chronological and geochemical data from this study are combined with previously published datasets to reveal secular variations in magmatism throughout the entire Ethiopian volcanic region. …

    Journal of Petrology 60(8), 1681-1715, 2019-09-12

    IR 

  • The Effect of Wind and Atmospheric Stability on the Morphology of Volcanic Plumes From Vulcanian Eruptions

    Poulidis A. P. , Takemi T. , Iguchi M.

    Volcanic plumes from small and moderate eruptions represent a challenge in the study of plume morphology due to eruption source parameter uncertainties and atmospheric influence. … A data set of 896 eruptions between 2009 and 2016 with well‐constrained plume heights, estimated erupted mass, and associated atmospheric conditions has been compiled. …

    Journal of Geophysical Research: Solid Earth 124(8), 8013-8029, 2019-08

    IR 

  • Continuous monitoring of soil CO2 flux at Aso volcano, Japan: the influence of environmental parameters on diffuse degassing

    Morita Masaaki , Mori Toshiya , Yokoo Akihiko , Ohkura Takahiro , Morita Yuichi

    … Continuous measurements of soil CO2 flux are useful for understanding degassing processes and for monitoring volcanic activities. … Recent studies at many volcanoes have revealed that soil CO2 flux variations are significantly influenced by environmental parameters as well as volcanic processes. … However, the anomaly after the 8 October 2016 eruption was not completely explicable by the variations in the environmental parameters and coincided with increases in seismic amplitude and plume SO2 flux. …

    Earth, Planets and Space (71), 2019-01-07

    IR 

  • Verification of Volcanic Eruption Plume Height Estimation Method with Weather Radar  [in Japanese]

    SATO Eiichi , FUKUI Keiichi , SHIMBORI Toshiki

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2019(0), 14-14, 2019

    J-STAGE 

  • Origin of mercury upwelling at the convergent margin of Philippine Sea Plate, Southwest Japan  [in Japanese]

    Masuda harue , Takeuchi Akinori , Ishibashi Junichiro , Matsushima Takeshi

    <p> 水銀は地圏では活動的な元素であり、マグマ活動と関連する熱水活動に伴って移動する。しかし、西南日本ではマグマ活動が顕在しない地域で水銀が10mよりも浅い井戸水に観察されることがある。霧島連山硫黄山で得られたマグマ水中の水銀の挙動と比較して、大阪平野の地下水中水銀の起源について考察した。マグマ水中ではヒ素がイオウと親和的に挙動するのに対して、水銀は気体になりやすい傾向が明らかであっ …

    Abstracts of Annual Meeting of the Geochemical Society of Japan 66(0), 122, 2019

    J-STAGE 

  • Integrated Monitoring of Volcanic Ash and Forecasting at Sakurajima Volcano, Japan

    Iguchi Masato , Nakamichi Haruhisa , Tanaka Hiroshi , Ohta Yusaku , Shimizu Atsushi , Miki Daisuke

    … We installed an integrated monitoring system for the detection of volcanic ash (composed of remote sensing sensors XMP radars, lidar, and GNSS with different wave lengths) and 13 optical disdrometers on the ground covering all directions from the crater to measure drop size distribution and falling velocity. … Campaign sampling of volcanic ash supports the conversion of particle counts measured by the disdrometer to the weight of volcanic ash. …

    Journal of Disaster Research 14(5), 798-809, 2019

    J-STAGE 

  • Special Issue on Integrated Study on Mitigation of Multimodal Disasters Caused by Ejection of Volcanic Products: Part 2

    Iguchi Masato , Nakada Setsuya , Miyamoto Kuniaki

    … <p>Our research project titled "Integrated study on mitigation of multimodal disasters caused by ejection of volcanic products" began in 2014 under SATREPS (Science and Technology Research Partnership for Sustainable Development) and is now coming to an end in 2019. … The 2014 eruption of Kelud formed a gigantic ash plume over 17 km high, dispersing ash widely over the island of Java. …

    Journal of Disaster Research 14(1), 5-5, 2019

    J-STAGE 

  • Numerical Simulations of Volcanic Ash Plume Dispersal for Sakura-Jima Using Real-Time Emission Rate Estimation

    Tanaka Hiroshi L. , Iguchi Masato

    … <p>In this study, a real-time volcanic ash dispersion model called PUFF is applied to the Sakura-jima volcano erupted on 16 June 2018 to assess the performance of the new system connected with a real-time emission rate estimation. … According to the time series of the estimated emission rate, a major eruption occurred at 7:20 JST indicating an emission rate of 1000 t/min and continued for 15 min showing a plume height of 4500 m. …

    Journal of Disaster Research 14(1), 160-172, 2019

    IR  J-STAGE 

  • Meteorological Controls on Local and Regional Volcanic Ash Dispersal

    Poulidis Alexandros P. , Phillips Jeremy C. , Renfrew Ian A. , Barclay Jenni , Hogg Andrew , Jenkins Susanna F. , Robertson Richard , Pyle David M.

    Volcanic ash has the capacity to impact human health, livestock, crops and infrastructure, including international air traffic. … For recent major eruptions, information on the volcanic ash plume has been combined with relatively coarse-resolution meteorological model output to provide simulations of regional ash dispersal, with reasonable success on the scale of hundreds of kilometres. …

    Scientific Reports (8), 2018-05-02

    IR 

  • Salt shell fallout during the ash eruption at the Nakadake crater, Aso volcano, Japan: evidence of an undergrounds hydrothermal system surrounding the erupting vent

    Shinohara Hiroshi , Geshi Nobuo , Yokoo Akihiko , Ohkura Takahiro , Terada Akihiko

    … Salt-rich materials of various shapes were observed, falling from the volcanic plume during the active periods. … In May 2011, salt flakes fell from the gas plume emitted from an intense fumarole when the acid crater lake was almost dry. … The salt flakes are likely formed by the drying up of the crater lake water droplets sprayed into the plume by the fumarolic gas jet. …

    Earth, Planets and Space (70), 2018-03-20

    IR 

  • Possible occurrence of slab-related fluid in backarc lithosphere inferred from noble gas isotope ratio  [in Japanese]

    Yokokura Lena , Yamamoto Junji

    日本列島における火山活動は沈み込んだ太平洋プレートの脱水によってマントルウェッジに加水された結果,比較的低温でマグマが発生することで可能になる。しかし日本列島より西にある中国東北部、北朝鮮国境近くの火山群については今だ原因が議論の的となっている。この噴火原因の説として下部マントル由来のプリューム、沈み込んだスラブからの脱水などがあげられている。今回私達は中国東北部の火山で採取されたマントル捕獲岩包 …

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences 2018(0), 145, 2018

    J-STAGE 

  • Effect of volcanic ejecta form Sakurajima on the atomospheric environment in 2017  [in Japanese]

    SAKAMOTO Masaya , KINOSHITA Kisei

    【災害のためプログラム中止】 平成30年北海道胆振東部地震により学術大会のプログラムが大幅に中止となりました.中止となったプログラムの講演要旨については,著者のプライオリティ保護の見地からJ-STAGEに公開し,引用可能とします.ただし,学術大会においては専門家による議論には供されていませんので「災害のためプログラム中止」との文言を付記します.(日本地質学会行事委員会)

    Annual Meeting of the Geological Society of Japan 2018(0), 278, 2018

    J-STAGE 

  • DETECTION OF TOPOGRAPHIC CHANGE CHARACTERISTICS AT KILAUEA VOLCANIC ERUPTION USING C-BAND SAR SATELLITE IMAGES  [in Japanese]

    SONOBE Masashi , HASHIBA Hideki

    2018年5月からハワイ島キラウエア火山の火山活動が活性化し,大規模な噴火が継続して発生している.これらの噴火によって溶岩流の流出,火山灰や火山ガスを含む噴煙が発生し,建物や道路,周辺環境に多くの損害を与えている.本研究では,CバンドSAR衛星のSentinel-1による観測情報を利用し,噴火による火口の形状の変化や溶岩流の広がりおよび地震による地殻変動の状況を調査した.結果として,火口の形状や溶 …

    Journal of Japan Society of Civil Engineers, Ser. F3 (Civil Engineering Informatics) 74(2), II_86-II_92, 2018

    J-STAGE 

  • Preliminary Results of Volcanic Ash Plume Reconstruction using Multiple Weather Radars  [in Japanese]

    SATO Eiichi , FUKUI Keiichi , SHIMBORI Toshiki , ISHII Kensuke , TOKUMOTO Tetsuo

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2018(0), 128-128, 2018

    J-STAGE 

  • Recent advances in earth and environmental sciences using natural stable isotopes as tracers  [in Japanese]

    Tsunogai Urumu

    … In this method, the hydrogen isotopic composition (D) of fumarolic H2 is obtained remotely from observation in a volcanic plume, and the outlet temperature is then derived from the obtained D of fumarolic H2. …

    Chikyukagaku 52(3), 107-129, 2018

    IR  J-STAGE 

  • Atmospheric environment around Sakurajima volcano  [in Japanese]

    坂本 昌弥 , 木下 紀正

    Visio : Research reports (47), 149-169, 2017-12

    IR  DOI 

  • Orographic effects on the transport and deposition of volcanic ash: A case study of Mt. Sakurajima, Japan

    Poulidis Alexandros P. , Takemi Tetsuya , Iguchi Masato , Renfrew Ian A.

    Volcanic ash is a major atmospheric hazard that has a significant impact on local populations and international aviation. … The topography surrounding a volcano affects the transport and deposition of volcanic ash, but these effects have not been studied in depth. …

    Journal of Geophysical Research: Atmospheres 122(17), 9332-9350, 2017-09-16

    IR 

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