Results 41 to 50 of about 304 (164)

The origin of fresh glass in phreatic eruptions at Rincón de la Vieja and Turrialba volcanoes, Costa Rica

Volcanica
Despite involving no fresh magma, phreatic eruptions are increasingly found to contain juvenile material. This study seeks to determine whether the glass is the result of an input of new magma or shallow stalled magma passively entrained.
Emily Mick, Geoffroy Avard, John Stix
doaj   +1 more source

Rock characteristics of post-caldera volcanoes in Dieng volcanic complex (DVC), Central Java, Indonesia

JGEET: Journal of Geoscience, Engineering, Environment and Technology, 2022
The Dieng volcanic complex (DVC) has one of the densest post-caldera volcanisms activity presents in Indonesia, yet its population density is considerably high.
Indranova Suhendro, Muhammad Nadafa Isnain, Rizky Wahyudi   +2 more
doaj   +1 more source

Modeling the Impact of Initiation Parameters on the Dynamics of the 2012 Te Maari Laterally Confined Debris Avalanche

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 3, March 2026.
Abstract Volcanic debris avalanches can transform into highly mobile debris flows, reaching long runout distances and posing significant hazards to downstream populations. This high mobility arises from complex, evolving rheological behavior driven by dynamic changes in pore pressure, internal resistance, and material properties during the flow.
Juliette Vicente, Stuart Mead
wiley   +1 more source

Hydrothermal alteration and sealing at Turrialba as a mechanism for phreatic eruption triggering

, 2021
<p>Turrialba is a basaltic to andesitic Holocene stratovolcano that after decades of quiescence re-activated in 1996 and has been highly active ever since. Turrialba is characterized by a highly active magmatic-hydrothermal system, and we propose that hydrothermal sealing and volatile accumulation are the mechanisms responsible for the ...
Emily Mick, John Stix, J. Maarten de Moor, Geoffroy Avard   +3 more
openaire   +2 more sources

Depressurization of a hydrothermal system following the August and November 2012 Te Maari eruptions of Tongariro, New Zealand

Geophysical Research Letters, 2016
In 2012, two phreatic eruptions occurred at New Zealand's Tongariro volcano for the first time in over a century. Interferometric Synthetic Aperture Radar data collected by the Italian Space Agency's COSMO‐SkyMed satellite constellation, indicates up to ...
I. J. Hamling, C. A. Williams, S. Hreinsdóttir   +2 more
doaj   +1 more source

Aeromagnetic survey in Kusatsu-Shirane volcano, central Japan, by using an unmanned helicopter

Earth, Planets and Space, 2021
Kusatsu-Shirane volcano is one of the active volcanoes in Japan. Phreatic explosions occurred in Mt. Shirane in 1983 and most recently, in 2018, in Mt. Motoshirane.
Takao Koyama, Wataru Kanda, Mitsuru Utsugi, Takayuki Kaneko, Takao Ohminato, Atsushi Watanabe, Hiroshi Tsuji, Taro Nishimoto, Alexey Kuvshinov, Yoshiaki Honda   +9 more
doaj   +1 more source

Stratigraphy of Carbonate‐Bearing Rocks at the Margin of Jezero Crater, Mars: Evidence for Shoreline Processes?

Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.
Abstract Martian carbonate‐bearing rocks are compelling targets for exploration because they preserve detailed records of past aqueous processes, climate, and habitability. The Margin unit in Jezero crater is a distinct olivine‐ and carbonate‐bearing unit stratigraphically underlying the western fan, lining the inner margin of the western crater rim ...
Alexander J. Jones, Sanjeev Gupta, Robert Barnes, Briony H. N. Horgan, Kenneth H. Williford, Gerhard Paar, Kathryn. M. Stack, Bradley J. Garzcynski, Eleni Ravanis, Candice C. Bedford, Justin I. Simon, Athanasios Klidaras, Linda C. Kah, James F. Bell, Justin Maki, Stephen W. Lokier, Adrian Brown, Nathan R. Williams, Sanna Alwmark, Jorge I. Núñez, Fred Calef, Larry Crumpler, Alicia Vaughan, Libby R. W. Ives, Sam Gwizd, Ken Farley, Christian Tate, Nicolas Randazzo, Olivier Beyssac, Gwénaël Caravaca   +29 more
wiley   +1 more source

Accurate hindcasting of explosive eruptions at Whakaari, New Zealand

Volcanica
Phreatic eruptions are small, sudden events, commonly with few precursory signals. They are driven by interactions between magmatic and hydrothermal processes at shallow levels beneath the surface.
John Stix, Craig Miller, Yajing Liu
doaj   +1 more source

Soil CO2 Degassing and Temperature at Poás Volcano: Evidence From the 2025 Eruptive Phase

Geofluids, Volume 2026, Issue 1, 2026.
Soil carbon dioxide (CO2) degassing provides valuable insights into volcano–hydrothermal systems, especially during their active phases. Soil CO2 flux and temperature surveys are particularly useful where direct access to vents is limited, providing information on subsurface magmatic dynamics.
Noé García-Martínez, Társilo Girona, Kyriaki Drymoni, Sara Emili, Martina Picciallo, Einat Lev, Conor A. Bacon, J. Maarten de Moor, Ángel Fernandez-Cortes, David Benavente, Fausto Grassa   +10 more
wiley   +1 more source

Eruption style transition during the 2017–2018 eruptive activity at the Shinmoedake volcano, Kirishima, Japan: surface phenomena and eruptive products

Earth, Planets and Space, 2023
Recent eruptions of the Shinmoedake volcano, Japan, have provided a valuable opportunity to investigate the transition between explosive and effusive eruptions. In October 2017, phreatic/phreatomagmatic explosions occurred.
Fukashi Maeno, Sayaka Shohata, Yuki Suzuki, Natsumi Hokanishi, Atsushi Yasuda, Yuya Ikenaga, Takayuki Kaneko, Setsuya Nakada   +7 more
doaj   +1 more source