Search Results 1-20 of 1712

  • Geological Structure and Timing of Landslide Occurred in Volcanic Rock Area, by the 2017 Northern Kyushu Heavy Rain Disaster  [in Japanese]

    松澤 真

    応用地質 = Journal of the Japan Society of Engineering Geology 59(6), 466-471, 2019-02

  • Linkage between watershed and estuary estimated from the stable isotope analysis of the intertidal snail, <i>Batillaria multiformis</i>

    Yokoyama Hisashi , Rihei Takahito , Sugimoto Ryo

    … Among 22 watershed parameters, which were classified into the land use, human population, topography, geology, and vegetation in the catchment area of each river, five parameters were significantly correlated with the δ<sup>15</sup>N of snails (Pearson's correlation coefficient <i>r</i>: all <i>p</i><0.05). …

    Plankton and Benthos Research 14(2), 97-104, 2019

    J-STAGE

  • Chemical and Isotopic Compositions of Fumarolic Gases from Yakedake Volcano, Japan  [in Japanese]

    SAITO Takeshi , SAWAMURA Shun , TAMURA Rina , SEKI Susumu , AMITA Kazuhiro , MISHIMA Taketoshi , OHSAWA Shinji

    … The apparent equilibrium temperatures estimated from the sulfur reactions were about 250-280°C, which decreased by about 200°Cshortly after the latest eruption and which were lower than the critical temperature of water, suggesting the formation of a volcanic hydrothermal system beneath the summit region. …

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 64(1), 1-9, 2019

    J-STAGE

  • GIS-based microzonation for liquefaction-induced ground damage in Auckland Region

    Altaf Omer , Wotherspoon Liam , Orense Rolando P. , Ballegooy Sjoerd V. , Roberts Ross

    Geology-based screening is initially applied across the region to identify areas where liquefaction is unlikely, with a separate categorisation for alluvial deposits with volcanic content in this region. … Where CPT soundings and groundwater data are available, detailed liquefaction assessments are carried out that enable refinement of classification beyond the high-level geology-based screening. …

    Japanese Geotechnical Society Special Publication 6(2), 38-44, 2019

    J-STAGE

  • Relationship between active faults and 222Rn concentration in Hot springs and Groundwaters around Kagoshima city, Japan  [in Japanese]

    川端 訓代 , 渡部 真衣 , 北村 有迅

    … Hot spring water temperature suggested that they conform to popular geothermal gradient, suggesting that the hot springs are currently not affected by heat from magma under Aira caldera and old volcanic ejecta. … These results suggest that radon concentration distribution of the hot springs and groundwater strongly associate with their hosting geology and geological structure. …

    鹿児島大学理学部紀要 = Reports of the Faculty of Science, Kagoshima University 51, 52-59, 2018-12-31

    IR

  • Research report of nature in mountain region in Toyama City (2017)  [in Japanese]

    藤田 将人 , 吉岡 翼 , 岩田 朋文 , 太田 道人 , Masato Fujita , Tasuku Yoshioka , Tomofumi Iwata , Michihito Ohta

    … 約30種の昆虫を観察した.このうちベニヒカゲ,オオルリボシヤンマ,ミヤマハンミョウ,カオジロトンボは高標高地帯を好む種であり,山岳地帯の調査ならではの結果であった.また,太郎山と祖父岳の登山道沿いでライチョウを発見した.(3)植物は,写真のEXIF情報から2300以上の植物分布データを抽出した.The geology, topology, fauna, and flora of the alpine and subalpine zone between Tarobeidaira and Kumonotaira in Toyama city were …

    富山市科学博物館研究報告 = Bulletin of the Toyama Science Museum (42), 61-64, 2018-07-01

    IR

  • Determining Earthquake Susceptible Areas Southeast of Yogyakarta, Indonesia—Outcrop Analysis from Structure from Motion (SfM) and Geographic Information System (GIS)

    Saputra Aditya , Gomez Christopher , Delikostidis Ioannis , Zawar-Reza Peyman , Hadmoko Danang Sri , Sartohadi Junun , Setiawan Muhammad Anggri

    … Located approximately a hundred kilometres north of Java Subduction Zone, Java Island has a complicated geology and geomorphology. … The north zone is dominated by the folded area, the centre is dominated by the active volcanic arc and the south of Java including the study area (Southeast part of Yogyakarta City), is dominated by the uplifted southern mountain. … However, the geology map of Yogyakarta is the only data that gives the characteristics of Opak Fault roughly. …

    Geosciences 8(4), 132, 2018-04-12

    IR

  • Lithostratigraphy of the Miocene Iwaine Formation in the Yatsuo area, central Japan

    Yamada Raiki , Yamada Naohiro

    … The Iwaine Formation is composed mainly of monomictic autobreccia, polymictic volcanic breccia, pumice tuff and coherent andesites, with clastic rocks whose clasts were derived from the Iwaine Formation, in stratigraphically ascending order. …

    Science reports of Niigata University. (Geology) 33, 25-40, 2018-03

    IR

  • Studies on nontectonic geologic structure in Japan: Recent progress and future perspective  [in Japanese]

    Nagata Hidehisa

    … Nontectonic faults are generated by the gravitational movement of rock masses, seismic shaking, and volcanic activity. … Also from the standpoint of engineering geology, which applies geological knowledge to human society, it is important to comprehensively clarify the formative mechanism and history of geological structures, including tectonic and nontectonic processes.</p> …

    The Journal of the Geological Society of Japan 124(11), 899-912, 2018

    J-STAGE

  • Geoecological study on the distribution of <i>Dicentra peregrina</i> around the gentle col between Mt. Ioudake and Mt. Yokodake, in Yatsugatake volcanic Range, central Japan  [in Japanese]

    KOIZUMI Takeei , TAKEUCHI Masaya

    … is a pioneer plant growing on the alpine periglacial debris fields or in the unstable volcanic desert in northern and central Japan. … In Yatsugatake volcanic Range, this plant is widely distributed around the gentle col between Mt. Ioudake and Mt. Yokodake. … To clarify the cause of extensive distribution of this plant, the authors examined volcanic geology and natural history of the areas where <i>D. …

    Vegetation Science 35(2), 89-107, 2018

    J-STAGE

  • Formation Age and Cooling History of Kojaku Granite  [in Japanese]

    SUEOKA Shigeru , SHIMADA Koji , ISHIMARU Tsuneari , DANHARA Tohru , IWANO Hideki , YAGI Koshi

    … samples of the Tsuruga body reflect long-term denudation whereas those of the Kojaku body might have been reheated by volcanic activity prior to ∼20 Ma. …

    Journal of Geography (Chigaku Zasshi) 127(6), 795-803, 2018

    J-STAGE

  • Kanto Syntaxis: when did it begin to grow?  [in Japanese]

    Hoshi Hiroyuki

    … However, sedimentary records in the earliest accreted volcanic edifice indicate that arc-arc collision began at 17 Ma or shortly later. … This is consistent with the age estimate of the onset of arc-arc collision inferred from the geology of the collision zone. …

    The Journal of the Geological Society of Japan 124(10), 805-817, 2018

    J-STAGE

  • Identification and correlation of tephras from the Plio-Pleistocene Shobudani Group, Kinokawa River, southwest Japan

    Maruyama Seiji , Takemura Keiji , Hirata Takafumi , Iwano Hideki , Yamashita Tohru , Danhara Tohru

    … <p>The abundances of 58 elements in volcanic glass shards from tephra samples of the Shobudani Group along the Kinokawa River, Japan, were analyzed using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). … However, in addition to the element abundances, incompletely hydrated volcanic glasses and the refractive index of coexisting ferrosilite suggest that the studied Shin'ike tephra sample is AT itself. …

    The Quaternary Research (Daiyonki-Kenkyu) 57(6), 211-227, 2018

    J-STAGE

  • Ore–microscopy and Geochemistry of Gold–Silver Telluride Mineralization in Southwestern Hokkaido, Japan

    YUNINGSIH Euis T. , MATSUEDA Hiroharu , SYAFRIE Ildrem

    … The dominant host rocks for this deposit type are intermediate to acid volcanic rocks. …

    Journal of Mineralogical and Petrological Sciences 113(6), 293-309, 2018

    J-STAGE

  • Geochemical mapping of remote islands around Kyushu, Japan

    Ohta Atsuyuki

    … A total of 193 stream sediments and three volcanic ash deposits collected from isolated islands around Kyushu were analyzed to determine the content of 53 elements to supplement land and sea geochemical mapping of the Kyushu area and regional Sr isotope mapping. … The relationship between the spatial distribution of elements in stream sediments and volcanic ash deposits and the geology was closely examined using geographical information system (GIS) software. …

    BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN 69(5), 233-263, 2018

    J-STAGE

  • Geology and Geochronology of Nulliak Supracrustal Rocks in Labrador, Canada: The Oldest Supracrustal Rocks and Evidence for the Operation of Plate Tectonics  [in Japanese]

    KOMIYA Tsuyoshi , AOKI Shogo , YOSHIDA Satoshi

    … Our geological mapping of Nulliak supracrustal belts in the Saglek Block shows that the belts contain ultramafic rock, mafic volcanic rock, chemical sedimentary rocks of banded iron formation, chert and carbonate rock, and clastic sedimentary rocks of pelitic rock and conglomerate. …

    Journal of Geography (Chigaku Zasshi) 127(5), 683-704, 2018

    J-STAGE

  • Spatial Analysis of the Landslide Characteristics Caused by Heavy Rainfall in the Northern Kyushu District in July, 2017 Using Topography, Geology, and Rainfall Levels

    Danjo Toru , Ishizawa Tomohiro , Kimura Takashi

    … In this study, the primary causes (topography and geology) and trigger factors (rainfall) for the sediment disaster were spatially analyzed to examine factors contributing to slope failure. … In addition, the slope angle of the slope-failure source point was sizable in volcanic rock areas and many landslides occurred in the valley-formed areas. …

    Journal of Disaster Research 13(5), 832-845, 2018

    J-STAGE

  • Early to Middle Pleistocene volcanic history in the area surrounding Lake Towada, Northeast Japan.  [in Japanese]

    Kudo Takashi

    … <p>Early to Middle Pleistocene volcanic history in the area surrounding Lake Towada was constructed based on stratigraphy, petrology and K–Ar and U–Pb age determinations. … The volcanic activity in this area started at 2.5 Ma after the period of inactive volcanic activity during Pliocene. … Andesite to dacite magma erupted from several eruptive centers and formed volcanic bodies during 2.5 to 1.6 Ma in the southeastern area. …

    BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN 69(3), 165-200, 2018

    J-STAGE

  • History of Azuma Volcano based on K–Ar age determinations.  [in Japanese]

    Matsumoto Akikazu , Nakano Shun , Furukawa Ryuta , Yamamoto Takahiro

    … According to the determined age data, the volcanic edifice was divided into 12 units including Holocene Jododaira Volcano. … The volcanic activity of Azuma Volcano began at ca. …

    BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN 69(3), 153-163, 2018

    J-STAGE

  • Eruptive history of Asahidake Volcano, central Hokkaido: New study of the stratigraphy and eruption ages of the Asahidake late stage products.  [in Japanese]

    Ishige Kosuke , Nakagawa Mitsuhiro , Ishizuka Yoshihiro

    … <p>The eruptive history and eruption style of Asahidake volcano, the youngest volcanic edifice of the Taisetsu Volcano Group, central Hokkaido, Japan, are investigated to evaluate its long-term volcanic hazards. … However, in the context of volcanic hazard mitigation, it should be noted that small-scale phreatic explosions and/or effusions of lahar similar to the 0.7 ka eruption might potentially occur and endanger tourism activities.</p> …

    The Journal of the Geological Society of Japan 124(4), 297-310, 2018

    J-STAGE

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