Results 31 to 40 of about 118 (99)

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

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
Sakamoto, Minoru, Sano, Yuji, Wakita, Hiroshi   +2 more
openaire   +2 more sources

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

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

Characteristics of Deep Long‐Period Earthquakes at Alaska Volcanoes From 2005 to 2017

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 6, June 2025.
Abstract Deep long‐period earthquakes (DLPs) are often detected near volcanoes from the crust down to the upper mantle. Exhibiting coincidence with volcanic eruptions, DLPs are recognized as potential precursors to volcanic activities yet their detection remains challenging.
Zilin Song, Yen Joe Tan
wiley   +1 more source

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

Quantitative evaluation of volcanic activity at Hakone Volcano, Japan, based on multiple observational datasets: application of the Volcanic Unrest Index

Earth, Planets and Space
Various phenomena occur in volcanic areas, including volcanic earthquakes, crustal deformation, and volcanic gas emissions. Observations are commonly conducted to understand this diverse activity; however, it is challenging even for experts to interpret ...
Ryo Kurihara, Kazutaka Mannen, Kotaro Toyama, Ryou Honda, Yuki Abe, Yutaka Nagaoka, George Kikugawa, Yuji Miyashita, Kazuhiro Itadera   +8 more
doaj   +1 more source

Tephrochronology and Eruptive Activity on Hakone Volcano in the Past 50ka.

The Quaternary Research (Daiyonki-Kenkyu), 1999
箱根火山周辺域に分布する箱根火山起源テフラ(降下軽石,火砕流堆積物)と富士火山起源テフラ,および広域テフラの層序関係を確立し,箱根火山中央火口丘の噴火活動史・火山体形成史を明らかにした.中央火口丘期の噴火活動は,新期カルデラ内に先神山(pre-Kamiyama)が形成されることにより始まった(約50ka).先神山の噴火活動は,最初,噴煙柱を形成しながら軽石を噴出していたが,徐々に軽石よりも類質岩片を多く噴出するようになり,最終的には先神山の一部が崩壊した(早川泥流CC2:約37,38ka).先神山崩壊後は,粘性の高い溶岩の大規模な流出に伴って,火砕流(block and ash flow)を頻繁に流下させながら溶岩ドームを形成する噴火様式に変化し,神山を中心とした中央火口丘群が次々と形成された ...
openaire   +2 more sources