Search Results 1-20 of 245

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Geology and eruption history of the Motoshirane Pyroclastic Cone Group, Kusatsu-Shirane Volcano, central Japan [in Japanese]

Ishizaki Yasuo , Nigorikawa Aki , Kametani Nobuko , Yoshimoto Mitsuhiro , Terada Akihiko

… and the Shirane Pyroclastic Cone Group (SPCG), which is the site of numerous historical phreatic eruptions. … In this study, we present the results of an investigation of the stratigraphy and eruption history of the MPCG. … In summary, the MPCG eruption sites shifted from south (the Motoshirane-nishi cone) to north (the Kagamiike-kita cone), and magmatic eruptions continued until just after ca. …

The Journal of the Geological Society of Japan 126(9), 473-491, 2020

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2

Subsurface Resistivity Imaging of Nasudake (Chausudake) Volcano Determined from Time Domain Electromagnetic Survey (TDEM)

Tanada Toshikazu , Nakamura Yoichi

A time domain electromagnetic survey (TDEM method) was conducted to investigate the resistivity structure of the crater, fumarole, and hot spring area of the Nasudake (Chausudake) volcano. Th …

Journal of Disaster Research 15(6), 735-744, 2020

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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. …

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

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4

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

NOGAMI Kenji , ONIZAWA Shin'ya

… 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

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5

Air-Fall Ash from the Main Crater of Asama Volcano on August 7, 2019, and its Water-Soluble Components

Yaguchi Muga , Terada Akihiko , Ogawa Yasuo

… We collected volcanic ash immediately following the eruption of Mt. Asama on August 7, 2019, observed the characteristics of ash particles, and analyzed the water-soluble components. … These results indicate that this eruption was caused by the phreatic explosion and that part of the volcanic edifice of Mt. Asama was fractured and emitted. …

Journal of Disaster Research 15(1), 53-56, 2020

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6

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. …

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

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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

… The results of our observations during an active period before and after a large phreatomagmatic eruption on 8 October 2016 and during a calm period from 2017 showed variations in soil CO2 flux due to oscillations in environmental parameters. … 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

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8

Compressive Deformation Properties of Polypropylene/Polyamide11 Alloy With Unique Phase Structure at a Wide Range pf Strain Rates [in Japanese]

YAMADA Hiroyuki , TOMITA Futoshi , KITO Masayuki , HIGUCHI Masahiro

Polypropylene/Polyamide11 (PP/PA11) alloy has a unique phase structure, which is called "salami structure", of nano order. It has been found that this material is superior to a polycarbonate …

The Proceedings of the Materials and Mechanics Conference 2019(0), OS1518, 2019

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9

Time-series of crustal deformation at Kusatsu-Shirane volcano revealed by PALSAR-1/2 data: Co-eruptive crustal deformation associated with the 2018 Kusatsu-Shirane phreatic eruption [in Japanese]

Himematsu Yuji , Ozawa Taku , Aoki Yosuke

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2019(0), 66-66, 2019

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10

Triggering process of a phreatic eruption at Motoshirane volcano (Kusatsu-Shirane) on January 23, 2018, derived from tremor and very-long period seismic signals analyses [in Japanese]

Yamada Taishi , Kurokawa Aika K. , Terada Akihiko , Kanda Wataru , Ueda Hideki , Aoyama Hiroshi , Ohkura Takahiro , Ogawa Yasuo , Tanada Toshikazu

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2019(0), 58-58, 2019

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11

Analysis of infrasound accompanying the 2018 small phreatic eruption from Kirishima Iwo-yama [in Japanese]

Muramatsu Dan , Matsusima Takeshi , Iwasa Yuichi , Ichihara Mie

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2019(0), 10-10, 2019

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12

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

… 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. …

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

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13

Special Issue on NIED Frontier Research on Science and Technology for Disaster Risk Reduction and Resilience 2019

Hayashi Haruo , Fukuyama Eiichi

… There were also other disasters: an avalanche accident on Nasudake in 2017 and a phreatic eruption of Kusatsu-Shiranesan in 2018.Due to the above-mentioned very frequent occurrence of such natural disasters on the Japanese islands, our institute has conducted several research projects to mitigate the damage from such disasters and to accelerate the recovery from them. …

Journal of Disaster Research 14(9), 1139-1139, 2019

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14

Constituent Mineral and Water-Soluble Components of Volcanic Ash from the 2018 Eruption of Mt. Motoshirane of Kusatsu-Shirane Volcano, Japan

Yaguchi Muga , Ohba Takeshi , Numanami Nozomi , Kawaguchi Ryohei

… Constituent minerals and water-soluble components of the volcanic ash discharged from the eruption of Mt. Motoshirane on January 23, 2018, were analyzed to investigate the source environment of this eruption. … The presence of pyrophyllite in the ash sample indicates that the explosion of this eruption took place at a depth reaching the basement rocks of Mt. Motoshirane. …

Journal of Disaster Research 14(7), 991-995, 2019

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15

Installation of New GNSS Network Around Kusatsu-Shirane Volcano, Japan: Its Perspective and the First Result

Noguchi Rina , Nishizawa Tatsuji , Kanda Wataru , Ohkura Takahiro , Terada Akihiko

… This network is sensitive to shallow depth activity, such as phreatic eruptions at the summit area, but is not applicable to deep magmatic activity, suggested to have been occurring for thousands of years by recent geological studies. … Then, four continuous sites commenced operation after a phreatic eruption at Mt. Motoshirane in January 2018. …

Journal of Disaster Research 14(5), 744-754, 2019

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16

Processes Controlling Evolution of Volcanic Activity Deduced from Volcanic Gas Observations [in Japanese]

SHINOHARA Hiroshi

… Volcanic gases are derived from a magma or a hydrothermal system, which are sources of magmatic or phreatic eruptions, respectively. … Common occurrence of excess degassing by explosive eruptions implies an eruption of a bubble-rich magma, suggesting that a bubble accumulation is a necessary condition of an eruption. …

BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 64(2), 121-129, 2019

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17

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

… We collected information on non-magmatic unrest events reported mainly of Japanese volcanoes that have been monitored for extended time periods, with the aim of conducting a statistical evaluation of these phenomena, which can sometimes lead to an eruption. …

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

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18

Prediction of Eruption Courses in Volcanoes Without Eruptions Under Modern Observation System: Example of Zao Volcano [in Japanese]

BAN Masao , OIKAWA Teruki , YAMASAKI Seiko , GOTO Akio , YAMAMOTO Mare , MIURA Satoshi

… Next, phreatic eruptions from Okama crater or other place inner part of Umanose caldera will occur, and may cause ballistic materials release, ash fall, pyroclastic surge, and lahar. … When the activity progresses, magmatic eruptions will be taken place from Goshikidake, and cause same phenomena as in the phreatic eruptions but larger in scale. … The possibility magmatic eruption takes place without preceding phreatic eruption can not be excluded. …

BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 64(2), 131-138, 2019

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19

The nature and source of the volcanic ash during the 2015 small phreatic eruption at Hakone volcano, central Japan

Yaguchi Muga , Ohba Takeshi , Sago Masakazu

… On June 29, 2015, a small phreatic eruption occurred in the Owakudani geothermal area on Hakone volcano, central Japan. …

GEOCHEMICAL JOURNAL 53(3), 209-217, 2019

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20

Special Issue on Integrated Program for Next Generation Volcano Research and Human Resource Development

Morita Yuichi , Fujita Eisuke , Nakagawa Mitsuhiro , Nakada Setsuya

… The phreatic eruption of the Ontake volcano in 2014 reminded us that even moderately active volcanoes, most of which are tourist attractions in Japan, can sometimes exhibit unpredictable and hazardous behaviors, taking away the lives of those who do not fully recognize their threat. … With this adding momentum, the Japanese people want volcanology and its applications to be developed to further improve the precision of volcanic eruption alerts. …

Journal of Disaster Research 14(4), 569-570, 2019

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