Results 61 to 70 of about 308 (170)

Petrological Constraints on Trachytic Magma Beneath Ioto, Ogasawara, Japan: Implications for Ongoing Post‐Caldera Volcanism

Island Arc, Volume 35, Issue 1, January/December 2026.
ABSTRACT Active volcanism commonly occurs in post‐caldera systems, many of which are characterized by crustal uplift associated with resurgent domes. Although geophysical studies have revealed diverse styles of post‐caldera deformation, petrological constraints on magma storage conditions during ongoing post‐caldera volcanism remain limited.
Takahiro Miwa, Masashi Nagai, Tomofumi Kozono, Setsuya Nakada, Atsushi Yasuda, Taku Ozawa, Hideki Ueda, Toshikazu Tanada, Eisuke Fujita   +8 more
wiley   +1 more source

Hydroacoustic observations of volcanic degassing

Seismica
Hydroacoustics is an often overlooked tool for volcanic monitoring, capable of recording everything from the release of millimetre sized bubbles to small scale phreatic eruptions and gas blowouts.
Corentin Caudron, Ben Roche, Jean Vandemeulebrouck, Julien Barrière, Leonardo Van der Laat   +4 more
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

Persistent Deep Long‐Period Seismicity Near the Lassen Volcanic Center

Geophysical Research Letters, Volume 52, Issue 23, 16 December 2025.
Abstract Deep long‐period (DLP) earthquakes have been observed at many volcanic settings around the world and linked to the magmatic processes that drive volcanic unrest. At the Lassen Volcanic Center (LVC) of the Cascade arc, limited detection of DLP activity hinders classification of anomalous seismic behavior and its relationship to the LVC magmatic
Eric Kiser, Kevin Ward, Clinton Koch, Emily Rodriguez, Haiyang Kehoe, Audrey Dunham, Peter Blake   +6 more
wiley   +1 more source

Facies Characterization and Volcanic Source Assignment of Marine Tephra Deposits Around São Miguel Island, Azores Archipelago

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 12, December 2025.
Abstract Long‐term tephrostratigraphies of volcanic islands such as the Azores are often limited to young and incomplete subaerial records. Here, we present a Pleistocene‐Holocene marine tephra archive around the eastern islands of the Azores based on 22 marine gravity cores.
J. C. Schindlbeck‐Belo, M. Andrade, J. Kling, S. Kutterolf, A. Pimentel, E. Lebas, A. Freundt, K. Pank, T. H. Hansteen   +8 more
wiley   +1 more source

Geochemical evaluation for the fumarolic gases collected at Ojigokudani, Iwate volcano, Japan in September 2024

Earth, Planets and Space
Anomalous earthquakes and crustal movements have been observed at Iwate volcano in northern Honshu, Japan, where phreatic eruptions have been feared since February 2024, and the volcanic alert level was raised from 1 to 2 on October 2, 2024. We collected
Muga Yaguchi, Takeshi Ohba, Shun Kanno
doaj   +1 more source

Renewed Explosive Phreatomagmatic Activity at Poás Volcano, Costa Rica in April 2017

Frontiers in Earth Science, 2018
Phreatic and phreatomagmatic eruptions at volcanoes often present no short term precursory activity, making them a challenge to forecast. Poás volcano, Costa Rica, exhibits cyclic activity with phreatic and some phreatomagmatic eruptions separated by ...
Rebecca O. Salvage, Rebecca O. Salvage, Geoffroy Avard, J. Maarten de Moor, Javier F. Pacheco, Jorge Brenes Marin, Monserrat Cascante, Monserrat Cascante, Cyril Muller, María Martinez Cruz   +9 more
doaj   +1 more source

Experimental constraints on phreatic eruption processes at Whakaari (White Island volcano)

Journal of Volcanology and Geothermal Research, 2015
AbstractVigorous hydrothermal activity interspersed by sequences of phreatic and phreatomagmatic eruptions occur at Whakaari (White Island volcano), New Zealand. Here, we investigate the influence of sample type (hydrothermally altered cemented ash tuffs and unconsolidated ash/lapilli) and fragmentation mechanism (steam flashing versus gas expansion ...
Mayer, Klaus, Scheu, Bettina, Gilg, Albert, Heap, Michael, Kennedy, Ben, Lavallée, Yan, Letham-Brake, Mark, Dingwell, Donald B.   +7 more
openaire   +5 more sources

Changes in Crater Morphology Associated With Volcanic Activity at Telica Volcano, Nicaragua

Geochemistry, Geophysics, Geosystems, 2020
Volcanic summit craters are typically noted to form by roof collapse into a depressurized magma chamber or by explosive excavation. Recent examples of effusive activity (e.g., Kilauea Volcano, Hawai'i) allowed specifically for quantification of the ...
Catherine Hanagan, Peter C. La Femina, Mel Rodgers   +2 more
doaj   +1 more source

First hydroacoustic recording of ebullition events in an active volcanic lake – Poás, Costa Rica

Volcanica
This study demonstrates how the sounds of subaqueous gas seeps can be used to measure the volume of volcanic gas being released into an active crater lake, weeks before an eruptive period.
Ben Roche, Corentin Caudron, Leonardo van der Laat, J. Maarten de Moor, Geoffroy Avard, Javier Pacheco, Henriette Bakkar, Julien Govoorts, Alejandro Rodriguez   +8 more
doaj   +1 more source