Search Results 1-20 of 55

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  • Great Earthquakes in the 17th Century along the Kuril and Japan Trenches  [in Japanese]

    佐竹 健治

    … Three volcanoes in southwest Hokkaido also erupted in the 17-18th century: Komagatake in 1640 and 1694, Usu in 1663, and Tarumai in 1667 and 1739. … Geological evidence of the 17th century earthquake, such as sharp contact of peat and mud layers indicating sudden coastal uplift or a sand layer indicating tsunami inundation, was found beneath tephra layers from these volcanoes. …

    東京大学地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo 92(2-4), 31-47, 2017

    IR

  • Erupted sand on the road surface due to liquefaction  [in Japanese]

    HORIUCHI Yuki , KUWANO Reiko

    <p>2011 年東北地方太平洋沖地震における広域な噴砂により,路面の不同沈下などに加えて路面下空洞や陥没などの被害があった.これを踏まえ,水頭差による上向き浸透流実験や振動台実験により舗装亀裂からの噴砂発生を模擬した模型実験を行ってきた.舗装と地表面の隙間を流れる水平流によって表面侵食が発生し,それによって砂が運ばれ噴砂となり亀裂部分から噴出する様子が観察された.本報では,その一連の …

    SEISAN KENKYU 68(4), 307-310, 2016

    J-STAGE

  • Observation of boiled sand erupted from liquefied layer  [in Japanese]

    HORIUCHI Yuki , KUWANO Reiko

    2011 年東北地方太平洋沖地震により液状化被害のあった茨城県潮来市においてトレンチ調査が行われ,液状化現象に起因するものと思われる砂脈が発見された.砂脈形成のメカニズム解明を目的として,調査においてサンプルを採取し,X 線CT スキャンによる内部観察を行った.その結果,砂脈を画像として捉えることができたと共に,液状化したと思われる砂質土において,液状化判定指標に用いられる幾つかの地質学的特徴が見 …

    SEISAN KENKYU 67(4), 349-350, 2015

    J-STAGE

  • Stratigraphic relationship between microlandform in the southern coastal plain of El Salvador, Central America, and the TBJ tephra erupted from Ilopango Caldera in the 3rd to 6th century:- Group Presentations of Micro-landform and Geography, 4th

    Kitamura Shigeru

    空中写真により、エルサルバドル共和国南部海岸低地レンパ川デルタからヒキリスコ潟にかけての地域の微地形を判読し、現地調査により微地形とイロパンゴカルデラ3~6世紀噴火に伴うTBJテフラとの層序関係を検討した結果、現在ヒキリスコ潟を閉塞する沿岸砂州(サン・フアン・デル・ゴソ半島)はイロパンゴカルデラの噴火後に形成されており、レンパ川下流域からヒキリスコ潟内部にかけて直線上に位置する微高地と島列は、噴火 …

    Proceedings of the General Meeting of the Association of Japanese Geographers 2014s(0), 100249, 2014

    J-STAGE

  • Sequence of the 120ka Adatara-Dake Eruption from Adatara Volcano, Fukushima, Japan : Based on Correlations between the Outcrops of Pyroclastic Fall Deposits at the Summit and Flow Deposits on the Flank and Foot of the Volcano(<Special Section>Determination of the Construction of an Outcrop Database to Reveal Eruptive History)  [in Japanese]

    FUJIWARA Ken-ichiro , HASEGAWA Takeshi , FUJINAWA Akihiko

    … We performed systematic sampling and description of the Adatara-Dake tephra outcrop on the summit of Adatara volcano, Fukushima Prefecture, Japan in order to reveal the detailed eruption sequence and temporal evolution of the magma system of this volcano that erupted 120ka BP. … The earlier layers (A to L) are characterized by successive pumice fall deposits, intercalated by thin volcanic sand layers. …

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 59(4), 229-239, 2014

    J-STAGE

  • STUDY OF SAND BOILING CHARACTERISTICS ALONG TOKYO BAY DURING THE 2011 TOHOKU-PACIFIC OCEAN EARTHQUAKE  [in Japanese]

    石川 敬祐 , 安田 進

    東北地方太平洋沖地震によって,東京湾岸エリアで発生した液状化被害の特徴は,埋立地の広範囲での液状化発生や液状化に伴う噴砂量が非常に多かったことが挙げられる.本報告は,湾岸エリアの噴砂の粒度特性や透水特性,噴砂の噴出特性に関して検討を実施した.その結果,噴砂は,細粒土を含む均質な細砂が主体であり,透水特性は,10<sup>-6</sup>(m/s)オーダーであった.ボイリング …

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 68(4), I_274-I_281, 2012

    J-STAGE

  • P71 History of large somma formation at Tengger-Bromo caldera volcano system  [in Japanese]

    Toshida Kiyoshi , Takeuchi Shingo , Takada Akira , Heriwaseso Anjar , Mulyana Rosgandika , Nursurim Asep

    … Tengger-Bromo volcano system has formed two calderas, Ngadisari and Sand Sea (Zaennudin, A. … More than half of the edifice volume erupted between 0.35-0.2 Ma and have formed much of the aprons, with average eruption rate greater than 2km^3/ky. … The age of Sand Sea eruption is determined to be about 50 ka from stratigraphy relations. …

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2012(0), 170, 2012

    J-STAGE

  • Primary succession in the lucidophyllous forest zone with special reference to the lava flows in Sakurajima, Japan  [in Japanese]

    HATTORI Tamotsu , MINAMIYAMA Noriko , IWAKIRI Koji , TOCHIMOTO Daisuke

    1.鹿児島県桜島の各種溶岩原の植生について,Tagawa(1964)他の文献を参考に遷移の進行,遷移系列,遷移年数に関する調査を2011年に行った.<BR>2.調査は昭和(1946),大正(1914),安永(1779) , 文明(1471)溶岩原および年代不明の溶岩原の腹御社の植生を対象とした.各溶岩原の植生は8種群によって各々クロマツ林(I),クロマツ林(II),タブノキ林(III) …

    Vegetation Science 29(2), 75-90, 2012

    J-STAGE References (55)

  • DInSAR Technique for Retrieving Volume Change of Volcanic Materials on Slope Area

    SRI SUMANTYO Josaphat Tetuko

    … In the present paper, we propose the application of a differential synthetic aperture radar interferometry (DInSAR) technique to retrieve the volume changes of the damaged area and the volcanic sediment on the sloped surface of Mount Merapi, Indonesia, which erupted on October 26 and November 4, 2010. … This technique was used to investigate the thickness of volcanic ash and the volume change of post-ejected wet lava (sand and rock) surrounding Mount Merapi by assessing L-band ALOS PALSAR data. …

    Technical report of IEICE. SANE 111(239), 269-274, 2011-10-10

    References (12)

  • Stratigraphy and paleoenvironment of Upper Pleistocene to Holocene sediments in the Ishikari Plain, Hokkaido, Japan  [in Japanese]

    Sagayama Tsumoru , Tonosaki Tokuji , Kondo Tsutomu , Okamura Satoshi , Sato Kiminori

    石狩平野の深度50 mのSSC-1,同44 mのH16B-7,同40 mのH16B-3,同18 mのMHR-1および同28.5 mのYUB-1の5掘削井の後期更新世~完新世地質試料について<sup>14</sup>C年代測定,珪藻分析,火山灰分析を行い,層序や古環境を検討した.珪藻分析ではH16B-7とH16B-3で「大量な海水の流入」が認められ,完新世の中期にバリア(砂州 …

    The Journal of the Geological Society of Japan 116(1), 13-26, 2010

    J-STAGE

  • Changes in the heavy mineral content and element concentration of Tarumae-a tephra with distance from the source volcano

    MIZUNO Naoharu , AMANO Yoji , MIZUNO Takafumi , NANZYO Masami

    … Tarumae-a (Ta-a) is a young tephra that erupted from Mt Tarumae in AD 1739. … Sand-size fractions of the tephra were divided into minerals with a specific gravity (ρ) higher than 2.9 (heavy minerals [HM]) and lower than 2.9 (light minerals [LM]), and the concentrations of 19 elements in the HM and LM were examined. … The ratio of HM to the total sand-size Ta-a was 38-58% within 42km, 21% at 113km and 5.8-8.7% at 290km from Mt Tarumae. …

    Soil Science and Plant Nutrition 54(6), 839-845, 2008-12-01

    References (31)

  • Andisols of New Zealand and Australia (International symposium on volcanic ash soils and field workshop in the Mt. Fuji area)

    LOWE David J. , PALMER David J.

    … Scoriaceous basaltic tephras erupted in northern North Island were locally distributed. … Intraplate basaltic volcanoes at Mts Gambier and Schank erupted c. … Sand fractions at Mt Gambier are dominated by exotic, silicic crystalline material (*80%) and relatively little glass (<20%) but at Mt Schank unaltered Al-rich glass predominates (*50%). …

    Bulletin of School of Agriculture, Meiji University 56(3), 120-146, 2007-02

  • Asama Eruption of 2004 : Field Investigations and Risk Communication through an Internet Forum  [in Japanese]

    HAYAKAWA Yukio , MAEJIMA Yoshinori , MIYANAGA Tadayuki , NAGAI Takayuki , SATO YUASA Shigeo , ARAI Masayuki

    … Asama Volcano repeatedly erupted in 2004. … From the plume, sand-sized micropumice and free-crystals continuously showered down at Karuizawa, 10 km SE from the source. …

    Journal of Geography (Chigaku Zasshi) 115(2), 149-171, 2006-04-25

    J-STAGE References (10) Cited by (1)

  • Correlation and AMS-^<14>C dating of the Late Pleistocene Tephra Layers in the Ohnuma Moor Deposits in the Eastern Part of the Chugoku Mountains, Western Japan(Proceedings of the 18^<th> Symposium on Chronological Studies at the Nagoya University Center for Chronological Research in 2005)  [in Japanese]

    KATOH Shigehiro , HANDA Kumiko , HYODO Masayuki , SATO Hiroshi , NAKAMURA Toshio , YAMASHITA Tohru , DANHARA Tohru

    第18回名古屋大学年代測定総合研究センターシンポジウム平成17(2005)年度報告 Proceedings of the 18th symposiumon on Chronological Studies at the Nagoya University Center for Chronological Research\in 2005 日時:平成18 (2006)年1月17日(火)、18日(水) …

    Summaries of Researches using AMS at Nagoya University (17), 77-91, 2006-03

    IR DOI

  • Andisols of New Zealand and Australia

    David J. LOWE , David J. PALMER

    … Scoriaceous basaltic tephras erupted in northern North Island were locally distributed. … Intraplate basaltic volcanoes at Mts Gambier and Schank erupted c. … Sand fractions at Mt Gambier are dominated by exotic, silicic crystalline material (≥80%) and relatively little glass (<20%) but at Mt Schank unaltered Al-rich glass predominates (≥50%). …

    Journal of Integrated Field Science (2), 39-65, 2005-03

    IR

  • Lithofacies and Fission-track Ages of Drilling Core from Okogashima Island : Implication for the Eruption History of Southern Margin of Aira Caldera  [in Japanese]

    FURUKAWA Kuniyuki , SAITO Takeshi , KAMATA Hiroki , DANHARA Tohru , MIKI Daisuke , ISHIHARA Kazuhiro

    … The pyroclastic materials in lower levels are composed mainly of tuffaceous sand with cross lamination, containing shell fossils. … The fission-track ages of around 0.4 Ma from the units B and C indicate that the deposits were erupted prior to the Aira pyroclastic eruptions. …

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 48(6), 491-497, 2003

    J-STAGE References (18)

  • GRAIN SIZE DISTRIBUTION OF ERUPTED SANDS DUE TO LIQUEFACTION  [in Japanese]

    NUMATA Atsunori , MORI Shin'ichiro

    液状化によって生じた噴砂は, その発生原理から液状化した土層の情報を多く保持し, しかも, 採取が容易であるので数多くの試料の分析が可能であり, 採取方法などに注意すれば, 液状化しやすい粒度組成を推定するための大きな手掛かりになると考えられる. このような理由から, 噴砂を数多く収集しその粒度組成について分析を行った. 対象とした噴砂は, 近年発生した13地震の液状化地点より採取されたもので, …

    Doboku Gakkai Ronbunshu 722, 129-147, 2002-12-21

    J-STAGE References (43) Cited by (2)

  • Identification of the Kuju-Daiichi Tephra Layer, and the Age of the Late Pleistocene Fluvial Terrace along the Matsuda River in Southwestern Shikoku, Japan  [in Japanese]

    KUMAHARA Yasuhiro , NAGAOKA Shinji

    本稿では四国南西部,松田川流域で見いだされた小川テフラ(新称)を記載し,本テフラと中部九州・九重火山から噴出した九重第一テフラとの対比を試みた.小川テフラは層厚20~40cm,中~細粒砂サイズの結晶質降下軽石層で,その鉱物組成は多量の普通角閃石と少量の斜方輝石・黒雲母・石英・磁鉄鉱からなる.小川テフラの層位は,鬼界アカホヤテフラ・姶良Tnテフラの下位に位置する.鉱物組成・重鉱物比・含有鉱物の屈折率 …

    The Quaternary Research (Daiyonki-Kenkyu) 41(3), 213-219, 2002-06-01

    J-STAGE References (15) Cited by (3)

  • Description and Correlation of the Nagate Tephra Found in the Terrace Deposits at the Southern Foot of Asan Range in Tokushima Prefecture, Southwestern Japan  [in Japanese]

    MORIE Takashi , OZAWA Hiroaki , OKUMURA Kiyoshi

    徳島県の吉野川北岸の中央構造線活断層系に沿った中位段丘堆積物中より,褐色~灰白色を呈する砂~シルトサイズで斑晶に富む火山灰を発見した.この火山灰を長手テフラと命名し,岩石記載的特徴,火山ガラスの屈折率および鉱物の主成分化学組成などをもとに,阿蘇4(Aso-4)テフラに対比した.<br>四国の中央構造線に沿う地域において,地形面の形成年代を知る手がかりは従来姶良Tn(AT)や鬼界アカホヤ …

    The Quaternary Research (Daiyonki-Kenkyu) 40(4), 331-336, 2001-08-01

    J-STAGE References (7) Cited by (4)

  • Chemical composition of the alluvial soils from the Kanto District, Japan: Preliminary study for the soil geochemical mapping (part 2).  [in Japanese]

    TERASHIMA Shigeru , OHTA Atsuyuki , IMAI Noboru , OKAI Takashi , MIKOSHIBA Masumi , TANIGUCHI Masahiro

    土壌地球化学図の作成に関する予察的研究の一環として,関東各地の沖積層から柱状試料を採取して主・微量元素を分析し土壌の母材や元素の広域分布特性,地球化学的挙動等を研究した.沖積層土壌の母材は,主として火山噴出物と河川由来砕屑物であり,両者の割合は地形・地質的な要因で変化する.沖積層土壌における元素濃度の鉛直変化は,火山灰質土のそれに比べて小さかった.これは堆積速度が速く, 表層~下層の風化度や腐植含 …

    BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN 52(8), 347-369, 2001

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