Results 31 to 40 of about 78,912 (151)

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

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

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

Identification and correlation of the Aso‐3 tephra in the Omaezaki area, central Japan: A valuable key stratum for the MIS 6/5 transition period

Journal of Quaternary Science, Volume 41, Issue 6, Page 972-986, August 2026.
ABSTRACT The Aso‐3 tephra is one of the most significant widespread marker layers from the Middle to Late Pleistocene, generated by a large caldera‐forming eruption at the Aso volcano in Kyushu, southwestern Japan. Despite its importance, a distal co‐ignimbrite ash correlative has yet to be clearly identified, primarily because although volcanic glass ...
Toshinori Sasaki, Takuya Morimoto, Tatsuyuki Ueno, Kazuo Mizoguchi, Norihisa Goto, Hisanori Ominami, Shohei Onaka   +6 more
wiley   +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

The Sr and Nd Isotopic Composition of Volcanic Rocks from the Hakone Volcano, Central Japan. [PDF]

, 2005
The ⁸⁷Sr/⁸⁶Sr and ¹⁴³Nd/¹⁴⁴Nd isotopic ratios of volcanic rocks from Hakone volcano range from 0.703384 to 0.703587 and 0.513018 to 0.513093, respectively. Some andesite, dacite and rhyolite of Hakone volcano show higher ⁸⁷Sr/⁸⁶Sr and ¹⁴³Nd/¹⁴⁴Nd ratios,
平原,由香, Tadashi,NAGAI, 周藤,賢治, Masaki,TAKAHASHI, Kenji,SHUTO, Yuka,HIRAHARA, 高橋,正樹, 永井,匡, Masashi,NAGAI, 長井,雅史   +9 more
core  

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

Crustal Movements Observed by the Tiltmeters during the 2015 Hakone Volcano Activity [PDF]

, 2017
Hakone volcano resumed a seismo-volcanic activity in April 2015. The activity led to a very small phreatic eruption on June 29 and 30. The Hot Springs Research Institute of Kanagawa Prefecture is operating a volcanic observation network composed of 7 ...
Kaito,KATANO, 原田,昌武, 片野,凱斗, Masatake,HARADA, Motoo,UKAWA, 鵜川,元雄   +5 more
core