Search Results 1-20 of 83

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  • Estimation of surface displacement around Kuju volcano before and after the 2016 Kumamoto earthquake using ALOS-2 data  [in Japanese]

    Mimura Yusuke , Ishitsuka Kazuya , Oda Yoshiya , Kubota Kenji

    … Mt. Iwo lies in Kuju volcano, where a phreatic eruption occurred in 1995, and still continues to eject smoke and ash. … In this study, therefore, in order to monitor the recent surface displacement of Kuju volcano, we applied SAR interferometry and SAR interferometry time-series analysis (SBAS analysis). …

    BUTSURI-TANSA(Geophysical Exploration) 73(0), 136-148, 2020

    J-STAGE 

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

    NOGAMI Kenji , ONIZAWA Shin'ya

    … <p>Asama volcano in central Honshu, Japan, commenced four-month-long eruptive activity on September 1, 2004, with a phreatic explosion after approximately 20 years of quiescence. … According to the mode of eruption, the activity is divided into three phases: Phase I, Phase II and Phase III, which are characterized by a phreatic explosion and plume activity, nonexplosive eruptions with swarms of BH-type earthquakes and explosions at short intervals, respectively. …

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

    J-STAGE 

  • CHARACTERISTICS OF SEDIMENT TRANSPORT IN SWASH ZONE ACCORDING TO GRANULARITY OF BOTTOM SEDIMENT  [in Japanese]

    越智 聖志 , 和田 京果 , 宮武 誠 , 佐々 真志

    土木学会論文集. B2, 海岸工学 Journal of Japan Society of Civil Engineers. 土木学会海岸工学委員会 編 75(2), I_463-468, 2019

  • Simple Structural Reinforcement of Roof of Wooden Buildings Subjected to Ballistic Ejecta Impact  [in Japanese]

    YAMADA Hiroyuki , TATEYAMA Kohei , HONDA Ryo , YOSHIMOTO Mitsuhiro , FUJII Toshitsugu

    … <p>Many casualties have been caused by the collision of lapilli and blocks ejecta (ballistic ejecta) following the phreatic eruptions of Mt. Ontake in September 2014 and Mt. Moto-Shirane, which is the southern part of Kusatsu-Shirane volcano, in January 2018 in Japan. … All structural reinforcement specimens comprised of the roofboard installed on a surface waterproof sheet and a Galvalume® steel sheet with 0.4mm thickness. …

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 64(4), 243-251, 2019

    J-STAGE 

  • INSIGHTS FROM ROUND-ROBIN SEEPAGE ANALYSIS EXERCISE ON RIVER LEVEE WETTING DUE TO RAINFALL INFILTRATION  [in Japanese]

    SHINSEI Akira , NISHIMURA Satoshi , FUJISAWA Kazunori , TAKESHITA Yuji , KAWAI Katsuyuki , SAKO Shunsuke , MORI Hirotoshi , YAMAZOE Nobutaka , OHTA Masayuki

    … <p> The stability assessment of river levee against intense rainfall and flooding involves predicting variations of the phreatic surface level and pore water pressure through unsaturated seepage analysis. …

    Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering) 75(4), 398-414, 2019

    J-STAGE 

  • CHARACTERISTICS OF SEDIMENT TRANSPORT IN SWASH ZONE ACCORDING TO GRANULARITY OF BOTTOM SEDIMENT  [in Japanese]

    OCHI Masashi , WADA Kyouka , MIYATAKE Makoto , SASSA Shinji

    <p> Applicability to image analysis methods test changed to two compositions of mixture sediment and sediment transport visualization experiments, were evaluted the topographic change profile du …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_463-I_468, 2019

    J-STAGE 

  • Long- and short-term pore water pressure variations in sandy river dike interpreted with 1- and 2-phase seepage flow analysis

    Nishiie Sho , Nishimura Satoshi , Yamazoe Nobutaka

    … However, previous trials suggest that this approach tends to reproduce much higher phreatic surface than observed in field during and after heavy rainfall. …

    Japanese Geotechnical Society Special Publication 7(2), 648-653, 2019

    J-STAGE 

  • On the Source Characteristics of Demagnetization and Ground Deformation Associated with Non-magmatic Activity  [in Japanese]

    HASHIMOTO Takeshi , UTSUGI Mitsuru , OHKURA Takahiro , KANDA Wataru , TERADA Akihiko , MIURA Satoshi , IGUCHI Masato

    … This is because weak sources at great depths cannot be detected, while overly strong sources close to the ground surface are physically impossible. …

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 64(2), 103-119, 2019

    IR  J-STAGE 

  • EFFECT OF DISCONTINUOUSLY LONGITUDINAL ARRANGEMENT OF DRAIN LAYER ON REDUCTION OF PHREATIC SURFACE IN RIVER LEVEE  [in Japanese]

    町田 陽子 , 二瓶 泰雄

    水工学論文集 Annual journal of Hydraulic Engineering, JSCE 63, I_1447-1452, 2018

  • EFFECT OF DISCONTINUOUSLY LONGITUDINAL ARRANGEMENT OF DRAIN LAYER ON REDUCTION OF PHREATIC SURFACE IN RIVER LEVEE  [in Japanese]

    MACHIDA Yoko , NIHEI Yasuo

    … This study aims to conduct 3D permeability numerical analysis to investigate the effect of discontinuous arrangement of drain layer in the longitudinal direction on the reduction of phreatic surface in river levee. … The results indicated that discontinuous arrangement of drain layer can reduce the phreatic surface in the cross section with and without the drain layers, showing that the effect of the drain layer diffuses in the longitudinal direction. …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74(5), I_1447-I_1452, 2018

    J-STAGE 

  • Kusatsu-Shirane volcano as a site of phreatic eruptions  [in Japanese]

    Terada Akihiko

    … <p>This paper reviews the hydrothermal systems of Kusatsu-Shirane volcano, Japan, which are associated with phreatic eruptions. … Phreatic eruptions seem to result from the growth of cracks connecting the reservoir to the surface. … Precursory changes in volcanic activity precede phreatic eruptions at Kusatsu-Shirane in most cases; …

    The Journal of the Geological Society of Japan 124(4), 251-270, 2018

    J-STAGE 

  • Growth process of the lava dome/flow complex at Sinabung Volcano during 2013–2016

    Nakada Setsuya , Zaennudin Akhmad , Yoshimoto Mitsuhiro , Maeno Fukashi , Suzuki Yuki , Hokanishi Natsumi , Sasaki Hisashi , Iguchi Masato , Ohkura Takahiro , Gunawan Hendra , Triastuty Hetty

    … The eruption started with a phreatic phase, changed to phreatomagmatic, and then andesite lava appeared at the summit crater in late December 2013. … Eruption volumes were estimated based on measurements with a laser distance meter during 6 periods, digital surface model (DSM) analysis of satellite images during one period, and the cumulative number of seismically detected PDC events, assuming a constant volume of each PDC event. …

    Journal of Volcanology and Geothermal Research, 2017-06-19

    IR 

  • INFLUENCE OF VARIOUS CONDITIONS OF DRAIN LAYER ON PHREATIC SURFACE AND STABILITY OF INFILTRATION IN RIVER LEVEE  [in Japanese]

    倉上 由貴 , 浅野 友里 , 篠原 麻太郎 , 二瓶 泰雄 , 成島 一輝 , 町田 陽子 , 桜庭 拓也 , 菊池 喜昭

    水工学論文集 Annual journal of Hydraulic Engineering, JSCE 61, Ⅰ_1333-1338, 2017

  • INFLUENCE OF VARIOUS CONDITIONS OF DRAIN LAYER ON PHREATIC SURFACE AND STABILITY OF INFILTRATION IN RIVER LEVEE  [in Japanese]

    KURAKAMI Yuki , ASANO Yuri , SHINOHARA Asataro , NIHEI Yasuo , NARUSHIMA Kazuki , MACHIDA Yoko , SAKURABA Takuya , KIKUCHI Yoshiaki

    …  This study aims to understand the influence of various conditions of drain layer on phreatic surface and stability of infiltration in river levee. … The results of the model test and numerical simulation revealed that: 1) the levee with drain along back slope reduced appreciably the phreatic surface compared to earthen levee, and 2) appropriate thickness of drain layer were discussed through numerical results. …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 73(4), I_1333-I_1338, 2017

    J-STAGE 

  • Hydrothermal System in the shallow part of Hakone Volcano inferred from surface displacements of the 2015 phreatic eruption  [in Japanese]

    Doke Ryosuke , Harada Masatake , Mannen Kazutaka , Itadera Kazuhiro , Takenaka Jun

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2017(0), 176-176, 2017

    J-STAGE 

  • <i>Rugosuscandona</i>, a New Genus of Candonidae (Crustacea: Ostracoda) from Groundwater Habitats in Texas, North America

    Külköylüoğlu Okan , Akdemir Derya , Yavuzatmaca Mehmet , Schwartz Benjamin F. , Hutchins Benjamin T.

    … The new genus differs from its congeners based on the presence of relatively long pore canals with sensory seta on the carapace surface, 6-segmented first antenna (A1), absence of bristles (t setae untransformed) and z setae on second antenna (A2), distinctly shaped male hemipenis and clasping organs, a simple claw-like uropod, and presence of 4+2 whorls on the Zenker's organ. …

    Species Diversity 22(2), 175-185, 2017

    J-STAGE 

  • Ash fall distribution of the 27 September 2014 eruption at Ontake Volcano, central Japan, based on Questionnaire Survey  [in Japanese]

    Takeshita Yoshihiro , Kiryu Kazuki , Hanai Yoshio , Kitazawa Natsuki , Kawakami Akihiro

    … <p>A phreatic eruption occurred from Ontake Volcano (3067 m a.s.l.) on September 27, 2014 (at 11:52 a.m.), resulting in the distribution of diluted volcanic ash over an area extending eastward. … This indicates that the deposition of trace amounts of ash is affected not only by prevailing wind direction, but also by local topographic effects on surface winds. …

    The Journal of the Geological Society of Japan 123(5), 291-307, 2017

    IR  J-STAGE 

  • Reconstruction of the 2014 eruption sequence of Ontake Volcano from recorded images and interviews

    Oikawa Teruki , Yoshimoto Mitsuhiro , Nakada Setsuya , Maeno Fukashi , Komori Jiro , Shimano Taketo , Takeshita Yoshihiro , Ishizuka Yoshihiro , Ishimine Yasuhiro

    … A phreatic eruption at Mount Ontake (3067 m) on September 27, 2014, led to 64 casualties, including missing people. … The onset of eruption was sudden, without any clear precursory surface phenomena (such as ground rumbling or strong smell of sulfide). … These models reconstructed from observations are consistent with the phreatic eruption models and typical eruption sequences recorded at similar volcanoes. …

    Earth, Planets and Space 68(79), 2016-05-14

    IR 

  • Cavity Preparation with Er,Cr:YSGG Laser and Composite Resin Restoration  [in Japanese]

    SHINKAI Koichi

    … have examined the mechanism of laser cutting for enamel and dentin, the effect of the ratio of water to air in the water spray on the efficiency of laser cutting, SEM analysis of laser-cut tooth surface and its alteration after applying various adhesive systems, the effect of various adhesive systems on the bond strength of composite resin to laser-cut enamel or dentin, the adaptation of composite resin to laser-prepared cavities, and the effect of laser preparation and adhesive system on pulp reaction using an erbium, chromium:yttrium-scandium-gallium-ga …

    Journal of Japanese Society for Laser Dentistry 27(3), 111-119, 2016

    J-STAGE  Ichushi Web 

  • Studies on the performance of geocomposite reinforced low-permeable slopes subjected to rainfall

    Viswanadham B.V.S. , Bhattacherjee Dipankana

    … However, the same low-permeable slope when provided with geocomposite layers, showed significant lowering of phreatic surface and reduced pore pressures, and was stable even 24 hours after completion of duration of rainfall. …

    Japanese Geotechnical Society Special Publication 2(69), 2362-2367, 2016

    J-STAGE 

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