Results 101 to 110 of about 139,835 (226)

Effect of temperature on the permeability of lava dome rocks from the 2004–2008 eruption of Mount St. Helens [PDF]

, 2016
As magma ascends to shallow levels in the volcanic conduit, volatile exsolution can produce a dramatic increase in the crystal content of the magma.
Chadderton, A, Gaunt, HE, Meredith, PG, Sammonds, PR   +3 more
core   +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

Bubble nucleation, growth and coalescence during the 1997 Vulcanian explosions of Soufrière Hills Volcano, Montserrat [PDF]

, 2010
International audienceSoufrière Hills Volcano had two periods of repetitive Vulcanian activity in 1997. Each explosion discharged the contents of the upper 0.5–2 km of the conduit as pyroclastic flows and fallout: frothy pumices from a deep, gas-rich ...
Arbaret, Laurent, Burgisser, Alain, Druitt, Timothy H., Galven, C., Giachetti, Thomas   +4 more
core   +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

Application of the Monopole Source to Quantify Explosive Flux During Vulcanian Explosions at Sakurajima Volcano (Japan) [PDF]

, 2014
A primary goal in volcano seismology is to characterize source motions internal to a volcano in terms of their representative forces. In a similar manner, much volcano infrasound research strives to recover eruptive force time histories corresponding to ...
Johnson, Jeffrey B., Miller, Alex J.C.
core   +2 more sources

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

Magma feeding system of the 1893 CE Meiji eruption of Azumayama Volcano, NE Japan

Earth, Planets and Space
Azumayama Volcano is one of the most active stratovolcanoes in northeastern Japan, with a ca. 1.2 million-year eruption history. Its hazard status was raised to volcanic alert level 2 (restricted access to the crater) in 2018 and 2019 due to an increase ...
Masao Ban, Shun Kanno, Motohiro Sato, Takumi Imura, Kae Tsunematsu, Takeshi Hasegawa, Tsukasa Ohba   +6 more
doaj   +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