Search Results 1-20 of 107

  • Disequilibrium features found among Janoo scoria, Akamizu lava and ACP1 tephra, precursory event of Holocene basaltic volcanism of Aso Volcano, SW Japan

    Brouillet Florian Christian Gerard , Hasenaka Toshiaki , Kawaguchi Masataka , Nishiyama Tadao

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2018(0), 197-197, 2018

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  • Relationship of surface geology with species composition and richness of evergreen broad-leaved forests on Kuchinoerabujima Island, Japan  [in Japanese]

    ISHIDA Hiroaki , YAGURA Yoshiki , KURODA Asumo , IWAKIRI Koji

    <p>1. 口永良部島は屋久島国立公園およびユネスコエコパークに指定されている火山島である.この島の照葉樹林は安山岩質の溶岩原と火山砕屑物の堆積地に分布している.溶岩原では露岩が数多くみられるが,火山砕屑物堆積地では露岩はまったくみられない.しかし,表層地質の違いや露岩の多寡が照葉樹林の種組成や種多様性にどのような影響を及ぼしているのかは明らかとなっていない.</p>< …

    Vegetation Science 35(1), 35-46, 2018

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  • Methods of Estimating the Durations of Super Large Eruptions Based on Pyroclastic Deposits  [in Japanese]

    HASEGAWA Takeshi , MOCHIZUKI Nobutatsu , OIWANE Hisashi

    … This procedure makes it possible to obtain the mean remanent magnetization of a tephra layer with a 95% confidence limit of about 2°, which is comparable to those of well-determined directions for lava. …

    Journal of Geography (Chigaku Zasshi) 127(2), 273-288, 2018

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  • Eruption History of Janoo Volcano in the Northwestern Part of Aso Caldera, Japan  [in Japanese]

    MIYABUCHI Yasuo

    … Fieldwork in and around the volcano has re-examined the detailed tephra stratigraphy and eruption age of Janoo Volcano. … The Akamizu lava (SiO<sub>2</sub>=57-59 wt.%) distributed west of the Janoo cinder cone, whose source was previously unknown, is attributed to Janoo Volcano based on the lava's petrographic characteristics. … The stratigraphy and characteristics of the tephra deposits suggest the following eruption sequence. …

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 62(1), 1-12, 2017

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  • K–Ar ages of lavas from the pre-caldera stage, Towada volcano, Northeast Japan  [in Japanese]

    Kudo Takashi

    <p>十和田火山先カルデラ期のより詳細な噴火史編年を目的として,給源近傍に分布する溶岩を対象に,K–Ar年代測定を行った.その結果,御鼻部山溶岩より 0.26±0.07 及び 0.13±0.06 Ma,発荷溶岩・火砕物より 0.09±0.06 及び 0.09±0.06 Maの年代が得られた.得られたK–Ar年代は,比較的誤差が大きいものの,いずれも層序と矛盾しない.給源遠方の上北平野に …

    BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN 67(6), 209-215, 2016

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  • Reexamination of the chronological position of Zenkoji debris avalanche of Usu volcano in south Hokkaido, Japan : In relation to paleoenvironmental changes during the past 20ka on the Usu coast  [in Japanese]

    Fujine Hisashi , Yokota Akihiro , Chiba Tatsuro , Kosugi Yasushi , Endo Kunihiko , Suzuki Masaaki , Yoshimoto Mitsuhiro , Suzuki Shigeru , Nakamura Kentaro , Ito Shigeru , Yamagata Hideki , Lomtatidze Zaur

    <p>有珠火山の南麓には善光寺岩屑なだれ堆積物(Zd)が多数の流れ山をなして分布する.Zdは従来,9kaから6kaに発生した有珠山外輪山の崩壊によるとされてきた.海岸の近くの岩屑なだれの流れ山に囲まれた標高約4.5mの低地においてボーリングコアを2本採取し,その層序,年代,堆積環境,植生変遷を検討した.両コアはほぼ岩相が同様で,標高+2~-6mにわたり連続的に泥炭層および有機質シルト・ …

    The Quaternary Research (Daiyonki-Kenkyu) 55(6), 253-270, 2016

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  • Landslide Disaster Triggered by the 2016 Kumamoto Earthquake in and around Minamiaso Village, Western Part of Aso Caldera, Southwestern Japan  [in Japanese]

    MIYABUCHI Yasuo

    … They occurred in unconsolidated superficial tephra deposits overlying lavas and agglutinates, and the thickness of the slides usually ranged from 4 to 8 m. … The deposits were composed of tephra blocks of a few meters and there was no evidence that they were transported by water. … The associated debris avalanche resulted in five casualties and severe damage to houses at the foot of the Takanoobane lava dome. …

    Journal of Geography (Chigaku Zasshi) 125(3), 421-429, 2016

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  • Topographic and Geological Features of Landslides Induced by the 2016 Kumamoto Earthquake in the Western Part of the Aso Caldera  [in Japanese]

    佐藤 達樹 , 千木良 雅弘 , 松四 雄騎

    … The bedrocks of the survey area consists of lava flows and pyroclastic rocks with a wide range of chemistry from basalt to rhyolite. … They are thickly covered by tephra, of which volcanic soil can be classified from color tone; … One of the most devastating types of landslides induced by this earthquake was of tephra slopes, because they occurred on rather gentle slopes and ran out long distances. … The landslides had sliding surfaces in three types of tephra; …

    京都大学防災研究所年報 (60), 431-452, 2016

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  • Growth History of Takachihonomine Volcano, Kirishima Volcanic Group Viewed from Tephra and Lava Stratigraphy  [in Japanese]

    山下 貴範 , 奥野 充 , 小林 哲夫

    月刊地球 37(4), 145-151, 2015-04

  • Volcanic geology and petrological features of Wadatoge Volcanic Rocks in Kirigamine area, Nagano.

    Nagai Masashi , Kannari Tarou , Tsurumaki Kensuke , Shibata Toru , Sugihara Shigeo

    Annual Meeting of the Geological Society of Japan 2015(0), 111, 2015

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  • Sediment transport processes induced by Typhoon No.26 in 2013 along the Omiya-sawa River basin in Izu-Oshima Island, Japan  [in Japanese]

    SATO Go , KOMORI Jiro , CHIBA Tatsuro , GOTO Satoshi , KISHIMOTO Hiroshi , HAYASHI Kazunori

    … The landslides in the Omiya-sawa basin occurred along a boundary between scoriaceous ash layers and low-permeability layers consisting of lava and lahar deposits. …

    Journal of the Japan Landslide Society 52(5), 255-260, 2015

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  • <sup>14</sup>C Dating of the Yt-Pm4 Tephra, the Youngest Pumice Fall from the Yatsugatake Volcano, Japan  [in Japanese]

    OISHI Masayuki

    … In this paper, I report a new AMS dating result of the Yt-Pm4 tephra, which is the youngest pumice fall from the Yatsugatake volcano. … A <sup>14</sup>C age of 30667±130 yr BP (32951-32333 cal BP: 2σ) was obtained from the charred wood collected at the uppermost part of the silty soil which is covered directly by the Yt-Pm4 tephra, suggesting that the eruption of the Yt-Pm4 tephra occurred at ca. …

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 60(4), 477-481, 2015

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  • Petrological characteristics of precursory eruption products from Aso-4 and Aira caldera-forming eruptions  [in Japanese]

    Hasenaka Toshiaki , Kurokawa Kiyoshi , Yamasaki Hideto , Sugiyama Fumiko , Sekiguchi Yuko , Mori Yasushi

    大規模なカルデラ形成噴火に至るまでにマグマ供給系にどのような変化が起こったかを知ることは,将来起こりうるカルデラ噴火のプロセスを理解する上で重要である.阿蘇-4火砕噴火,姶良火砕噴火の2つの大規模カルデラ形成噴火の直前に噴出したマグマの岩石学的特徴を検討した.研究対象は(1a)阿蘇-4火砕流の直前にカルデラの外,5km西に噴出した大峰火砕丘とそれに伴う高遊原溶岩,(1b)阿蘇カルデラ西方に阿蘇-3 …

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences 2014(0), 179, 2014

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  • Preliminary report on the landslides disaster, Oct. 2013, Izu-Oshima Volcanic island, central Japan:: (2) Shallow landslide, landforms, and geology

    Suzuki Takehiko

    2013年10月16日未明に発生した斜面崩壊はその分布から地形・地質との対応,とくに14世紀(西暦1338年?)に流下した溶岩流の分布域と崩壊域がよく一致することが指摘されている(国土交通省ホームページなど).すなわち崩壊の発生と地形・地質の間に因果関係が成り立つことを示唆する.理由として,比較的新しい時代の溶岩流の存在により,周辺域に比べて地表直下の透水層となる降下火山灰層が数m以下と薄く,表層 …

    Proceedings of the General Meeting of the Association of Japanese Geographers 2014s(0), 100125, 2014

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  • Sakurajima volcano  [in Japanese]

    Kobayashi Tetsuo , Sasaki Hisashi

    桜島火山は鹿児島湾最奥部を占める姶良カルデラの後カルデラ火山であり,その誕生は26,000年前である.歴史時代にも多くの噴火を繰り返したが,ちょうど100年前の大正噴火(1914年)で流出した溶岩で瀬戸海峡が埋め立てられ,大隅半島と陸続きとなったのは有名である.その後も山頂~山頂付近に生じた火口で活発な噴火活動を続けており,日本を代表する活火山である.本コースでは,桜島火山の歴史時代の噴出物や最新 …

    The Journal of the Geological Society of Japan 120(Supplement), S63-S78, 2014

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  • Introduction to the Special Issue on “Geology and Recent Eruptions of Irosin Caldera and Bulusan Volcano, Southern Luzon, Philippines (Part I)”  [in Japanese]

    OKUNO Mitsuru , Renato U. SOLIDUM Jr. Renato U. SOLIDUM Jr. , Ma. Hannah T. MIRABUENO Ma. Hannah T. MIRABUENO , Christopher G. NEWHALL Christopher G. NEWHALL , GESHI Nobuo , SUGAI Toshihiko , TANAKA Akiko , KOBAYASHI Tetsuo

    … Fifty-six stratovolcanoes, three caldera volcanoes accompanying four post-caldera volcanoes, three lava domes, four scoria cones including two maars, four lava fields, and ten shield volcanoes are identified. … The sequence of caldera-forming eruption at Irosin consists of a precursory fine ash eruption (Malobago lava dome), plinian pumice fallout, and intra-plinian flow deposits (Kobayashi <i>et al.</i>, 2014a). …

    Journal of Geography (Chigaku Zasshi) 123(1), 82-88, 2014

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  • Petrography of Irosin Ignimbrite and Co-ignimbrite Ash Fall Deposits, Southeast Luzon, Philippines  [in Japanese]

    DANHARA Tohru , OKUNO Mitsuru , YAMASHITA Tohru , Ma. Hannah T. MIRABUENO , TORII Masayuki , KOBAYASHI Tetsuo

    …  Irosin ignimbrite (41 cal kBP) and its related deposits were the first widespread tephra recognized in the Philippines. … A basal ash from the Malobago lava dome that preceded the ignimbrite eruption contains isolated crystals of orthopyroxene and irregular glass shards. …

    Journal of Geography (Chigaku Zasshi) 123(1), 143-152, 2014

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  • Eruptive Sequence and Characteristics of the Irosin Ignimbrite, Southern Luzon, Philippines  [in Japanese]

    KOBAYASHI Tetsuo , Ma. Hannah T. MIRABUENO , Ma. Antonia V. BORNAS , TORII Masayuki , Eduardo P. LAGUERTA , Arturo S. DAAG , Ericson B. BARISO , NAKAMURA Toshio , OKUNO Mitsuru

     フィリピン共和国,ルソン島南東端のソルソゴン地域での41 cal kBPの大規模火砕流噴火の結果,11 × 11 kmのイロシン(Irosin)カルデラが形成された。このときの噴火は,カルデラを形成する大規模噴火とその先駆的な噴火の2つに区分される。<br> 先駆的噴火は,現在のカルデラ縁の南東斜面の小規模溶岩ドームであるマロバゴ(Malobago)溶岩ドームの形 …

    Journal of Geography (Chigaku Zasshi) 123(1), 123-132, 2014

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  • Proposed Type Localities for Tephra Layers Erupted from the Kirishima Volcanic Group over the Past 30,000 Years(<Special Section>Determination of the Construction of an Outcrop Database to Reveal Eruptive History)  [in Japanese]

    TAJIMA Yasuhisa

    … The Kirishima volcanic group has produced many tephra layers and lava flows over the past 30,000 years, but few type localities have been established. … Unfortunately, one type locality for tephra layers from Kirishima volcanic group, described by Imura (1996) in Kamamuta settlement, was destroyed by road construction. … An alternative tephra locality near the destroyed one was found in the Kamamuta, and it is proposed a new type locality in this letter. …

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 59(4), 275-282, 2014

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  • Eruptive History of Ikeda Volcano, Ibusuki Area, Southern Kyushu, Japan(<Special Section>Determination of the Construction of an Outcrop Database to Reveal Eruptive History)  [in Japanese]

    INAKURA Hirohito , NARUO Hideto , OKUNO Mitsuru , KOBAYASHI Tetsuo

    … We made a detailed geological study to understand the eruptive history of the Ikeda volcano, which includes the Ikeda caldera, maars and lava domes. … The Senta lava was also effused before the Kikai-Akahoya tephra (7.3 cal kBP). … The central lava dome was formed during the late stage of this eruption. …

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 59(4), 255-268, 2014

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