Results 31 to 40 of about 630 (129)

Petrography of primary peridotites from the Ohsa-yama area, Okayama Prefecture [PDF]

, 1994
Ultramafic rocks exposed around Mt. Ohsa(= Ohsa-yama), Okayama prefecture, designated as "Ohsa-yama ultramafic body" all together, are one of the Alpine-type peridotites in the Sangun metamorphic belt.
Nozaka, Toshio, Shibata, Tsugio
core   +1 more source

Mineral paragenesis in thermally metamorphosed serpentinites, Ohsa-yama, Okayama Prefecture [PDF]

, 1995
The Ohsa-yama ultramafic body, which consists of several types of serpentinized peridotites, underwent contact metamorphism caused by a Cretaceous granite intrusion ; this metamorphism resulted in the formation of contact aureole, 1.5-2.0 km wide, around
Nozaka, Toshio, Shibata, Tsugio
core   +1 more source

Source constraints for the 2015 phreatic eruption of Hakone volcano, Japan, based on geological analysis and resistivity structure

Earth, Planets and Space, 2019
On June 29, 2015, a small phreatic eruption occurred in the most intensively steaming area of Hakone volcano, Japan. A previous magnetotelluric survey for the whole volcano revealed that the eruption center area (ECA) was located near the apex of a bell ...
Kazutaka Mannen, Toshikazu Tanada, Akira Jomori, Takashi Akatsuka, George Kikugawa, Yui Fukazawa, Hiroyuki Yamashita, Koichiro Fujimoto   +7 more
doaj   +1 more source

Time variations in the chemical and isotopic composition of fumarolic gases at Hakone volcano, Honshu Island, Japan, over the earthquake swarm and eruption in 2015, interpreted by magma sealing model

Earth, Planets and Space, 2019
Definite increases in the components ratios of CO2/H2O, CO2/H2S, CO2/CH4 and He/CH4 were observed at the fumarolic gases from Owakudani geothermal area located at the center of Hakone volcanic caldera (Honshu Island, Japan), synchronized with the ...
Takeshi Ohba, Muga Yaguchi, Kana Nishino, Nozomi Numanami, Yasushi Daita, Chiho Sukigara, Masanori Ito, Urumu Tsunogai   +7 more
doaj   +1 more source

InSAR analysis for detecting the route of hydrothermal fluid to the surface during the 2015 phreatic eruption of Hakone Volcano, Japan

Earth, Planets and Space, 2018
Although the 2015 Hakone Volcano eruption was a small-scale phreatic eruption with a discharged mass of only about 100 tons, interferometric synthetic aperture radar successfully detected surface deformations related to the eruption.
Ryosuke Doke, Masatake Harada, Kazutaka Mannen, Kazuhiro Itadera, Jun Takenaka   +4 more
doaj   +1 more source

Infrasonic wave accompanying a crack opening during the 2015 Hakone eruption

Earth, Planets and Space, 2018
To understand the initial process of the phreatic eruption of the Hakone volcano from June 29 to July 01, 2015, we analyzed infrasound data using the cross-correlation between infrasound and vertical ground velocity and compared the results of our ...
Yohei Yukutake, Mie Ichihara, Ryou Honda
doaj   +1 more source

3He/4He ratio distribution in and around the Hakone volcano.

GEOCHEMICAL JOURNAL, 1992
To investigate a fine structure of the 3He/4He ratio distribution in and around a single volcano, fumarolic gases, geothermal gases and waters were collected at 13 sites within the caldera of the Hakone volcano, Japan. The 3He/4He and 4He/20Ne ratios vary from 6.7 × 10-6 to 9.6 × 10-6, and 0.85 to 26, respectively. The 3He/4He ratios, corrected for air
Minoru Sakamoto, Yuji Sano, Hiroshi Wakita   +2 more
openaire   +2 more sources

Aluminum dynamics in nitrogen‐saturated Andisols in Tokyo

Ecological Research, Volume 40, Issue 3, Page 293-302, May 2025.
Atmospheric nitrogen (N) deposition in throughfall has decreased in forests around the Tokyo metropolitan area. The present study was conducted to elucidate the effect of decreased nitrogen deposition on aluminum (Al) dynamics in a forested allophanic Andisols. Mobilization of Al tended to decrease, in particular in the Japanese cedar stand.
Mitsuhisa Baba, Masanori Okazaki, Yuko Itoh, Kazuhide Matsuda, Fuka Tachiyanagi, Koki Toyota   +5 more
wiley   +1 more source

Spatiotemporal Variations and Postseismic Relaxation Process Around Mt. Fuji, Japan, During and After the 2011 Tohoku‐Oki Earthquake

Journal of Geophysical Research: Solid Earth, Volume 129, Issue 2, February 2024.
Abstract To monitor the volcanoes at a high spatiotemporal resolution, we introduce the singular value decomposition‐based Wiener filter and the three‐component waveforms in ambient noise velocity monitoring. The continuous ambient noise data from 63 stations around Mt. Fuji and Mt.
Y. Kakiuchi, H. Nimiya, T. Tsuji
wiley   +1 more source

Fracture Structures in and Around Hakone Volcano Revealed by Dense Seismic Observations

Journal of Disaster Research, 2022
Preexisting fracture systems, including old fissures, dikes, and microfractures in the caldera, are possibly used as channels for magma and hydrothermal fluid intrusions during an eruption. To reveal such a fracture system in the Hakone volcano, we used the fuzzy c-means method to perform clustering on S-wave splitting analysis results.
Ryou Honda, Yuki Abe, Yohei Yukutake, Shin’ichi Sakai   +3 more
openaire   +1 more source