Results 61 to 70 of about 331 (178)

Crystal‐Rich Magma Is Solid‐Like and Liquefies When Deformed

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 3, March 2025.
Abstract The rheology of highly crystalline magma regulates its mobility, which may, in turn, determine the occurrence and styles of volcanic eruptions. We measured the rheology of high‐temperature magma with a basaltic‐andesite composition to document the properties that govern the transition from solid‐like to liquid‐like behavior.
Atsuko Namiki, Konan Saito, Satoshi Okumura, Masato Hoshino, Kentaro Uesugi, Kazuhiro Tsukada, Natsuko Takagi, Michael Manga   +7 more
wiley   +1 more source

Surface‐Wave Relocation and Characterization of the October 2023 Tsunamigenic Seismic Unrest Near Sofugan Volcano, Izu Islands, Japan

Geophysical Research Letters, Volume 52, Issue 3, 16 February 2025.
Abstract A moderate‐magnitude earthquake swarm occurred in the remote Izu Islands region of Japan between October 1 and 8, 2023. The swarm included 151 shallow earthquakes cataloged by the U.S. Geological Survey, which notably included a roughly 2.5‐hr episode of 15 successive magnitude (M) < 5.5 earthquakes.
C. A. Deane, J. D. Pesicek, S. G. Prejean, P. S. Earle, D. R. Shelly, W. L. Yeck   +5 more
wiley   +1 more source

Eruption Source Parameters for forecasting ash dispersion and deposition from vulcanian eruptions at Tungurahua volcano: Insights from field data from the July 2013 eruption

Journal of Volcanology and Geothermal Research, 2016
Tungurahua volcano, located in the central area of the Ecuadorian Sierra, is erupting intermittently since 1999 alternating between periods of quiescence and explosive activity. Volcanic ash has been the most frequent and widespread hazard provoking air contamination episodes and impacts on human health, animals and crops in the surrounding area. After
Parra, R., /Bernard, Benjamin, Narvaez, D., /Le Pennec, Jean-Luc, Hasselle, N., Folch, A.   +5 more
openaire   +3 more sources

Seismic Signatures of Fluctuating Fragmentation in Volcanic Eruptions

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 1, January 2025.
Abstract Fragmentation plays a critical role in eruption explosivity by influencing the eruptive jet and plume dynamics that may initiate hazards such as pyroclastic flows. The mechanics and progression of fragmentation during an eruption are challenging to constrain observationally, limiting our understanding of this important process.
Katherine R. Coppess, Fredric Y. K. Lam, Eric M. Dunham   +2 more
wiley   +1 more source

Dynamics, Monitoring, and Forecasting of Tephra in the Atmosphere

Reviews of Geophysics, Volume 62, Issue 4, December 2024.
Abstract Explosive volcanic eruptions inject hot mixtures of solid particles (tephra) and gasses into the atmosphere. Entraining ambient air, these mixtures can form plumes rising tens of kilometers until they spread laterally, forming umbrella clouds. While the largest clasts tend to settle in proximity to the volcano, the smallest fragments, commonly
F. Pardini, S. Barsotti, C. Bonadonna, M. de’ Michieli Vitturi, A. Folch, L. Mastin, S. Osores, A. T. Prata   +7 more
wiley   +1 more source

Understanding and forecasting phreatic eruptions driven by magmatic degassing

Earth, Planets and Space, 2018
This paper examines phreatic eruptions which are driven by inputs of magma and magmatic gas. We synthesize data from several significant phreatic systems, including two in Costa Rica (Turrialba and Poás) which are currently highly active and hazardous ...
John Stix, J. Maarten de Moor
doaj   +1 more source

Satellite Geodesy Uncovers 15 m of Slip on a Detachment Fault Prior to the 2018 Collapse at Anak Krakatau, Indonesia

Geophysical Research Letters, Volume 51, Issue 22, 28 November 2024.
Abstract On 22 December 2018, parts of the Anak Krakatau edifice collapsed, triggering a deadly tsunami. To investigate pre‐collapse surface displacements, we analyzed Interferometric Synthetic Aperture Radar satellite geodetic data from 2006 to 2018, acquired from ALOS‐1 (2006–2011), COSMO‐SkyMED (2012–2018), and Sentinel‐1 (2014–2018).
Young Cheol Kim, Christelle Wauthier, Thomas R. Walter   +2 more
wiley   +1 more source

Rapid Gas Bubble Growth in Basaltic Magma as a Source of Deep Long Period Volcanic Earthquakes

Journal of Geophysical Research: Solid Earth, Volume 129, Issue 11, November 2024.
Abstract In this paper, we present numerical modeling aimed to explain Deep Long Period (DLP) events occurring in middle‐to‐lower crust beneath volcanoes and often observed in association with volcanic eruptions or their precursors. We consider a DLP generating mechanism caused by the rapid growth of gas bubbles in response to the slow decompression of
Oleg Melnik, Vladimir Lyakhovsky, Nikolai M. Shapiro   +2 more
wiley   +1 more source

An Endogenic Origin for Titan's Rampart Craters: Assessment of Explosion Mechanisms

Journal of Geophysical Research: Planets, Volume 129, Issue 10, October 2024.
Abstract Rampart craters are a class of lakes or depressions in Titan's north polar region that have morphological attributes suggestive of an explosive origin. Two previous studies have proposed that rampart craters form via nitrogen or methane vapor explosions analogous to terrestrial maar explosions.
G. E. Brouwer, L. R. Schurmeier, S. A. Fagents   +2 more
wiley   +1 more source

Two‐phase magma flow with phase exchange: Part II. 1.5D numerical simulations of a volcanic conduit

Studies in Applied Mathematics, Volume 153, Issue 3, October 2024.
Abstract In a review paper in this same volume, we present the state of the art on modeling of compressible viscous flows ranging from single‐phase to two‐phase systems. It focuses on mathematical properties related to weak stability because they are important for numerical resolution and on the homogenization process that leads from a microscopic ...
Alain Burgisser, Marielle Collombet, Gladys Narbona‐Reina, Didier Bresch   +3 more
wiley   +1 more source