Results 81 to 90 of about 1,522 (205)

Volcanic and sedimentary processes in phreatomagmatic volcanoes [PDF]

, 1982
Phreatomagmatic volcanoes form when ascending magma explosively interacts with surface or groundwater at shallow depths. Three types of phreatomagmatic activity are recognised- phreaticp phreatomagmatic (s. s. ) and surtseyan - based on the degree of
Leys, C.A., Leys, Clyde Andrew
core  

Spontaneous unsteadiness and sorting in pyroclastic density currents and their deposits [PDF]

Pyroclastic density currents form from a range of volcanic eruption styles, as well as lava dome collapse and retrogressive failure of existing deposits.
Pete Rowley (21566552), Gregory Smith (2393290), Olivier Roche (2364340), Nemi Walding (16410684), Matthew Johnson (261937), Natasha Dowey (21566554), Dan Parsons (13768621), Rebecca Williams (10184579), Thomas Johnston (22357763), Alison Provost (22357765)   +9 more
core   +2 more sources

Volcanoes Erupt Stressed Quartz Crystals

Geophysical Research Letters, 2019
Volcanic eruptions are energetic events driven by the imbalance of magmatic forces. The magnitudes of these forces remain poorly constrained because they operate in regions that are inaccessible, either underground or dangerous to approach.
K. S. Befus, M. Manga, C. Stan, N. Tamura   +3 more
doaj   +1 more source

Rift Development, Tectonic Forcings, and Magmatic Feedbacks at Santorini and Kolumbo Volcanoes Constrained by Scientific Drilling and Core‐Seismic Integration

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 6, June 2026.
Abstract Volcanism in continental rifts, rifted volcanic arcs, and back‐arc basins is fundamentally coupled with crustal extension. However, the precise geometry and timing of the fault systems that facilitate magma transport and accommodate extension remain poorly constrained.
Jonas Preine, Christian Hübscher, Tim Druitt, Matthias Hartge, Abigail Metcalfe, Steffen Kutterolf, Katharina Pank, Jens Karstens, Paraskevi Nomikou, Masako Tominaga, Emilie Hooft, Beck Hufstetler, Kaisa Autumn, Gareth Crutchley, Maria B. Jover, Christian Berndt, Thomas A. Ronge, IODP Expedition 398 Scientists   +17 more
wiley   +1 more source

A note on the flow of a homogeneous intrusion into a two-layer fluid

, 2007
The intrusion of a constant density fluid at the interface of a two-layer fluid is considered. Numerical solutions are computed for a model of a steady intrusion resulting from flow down a bank and across a broad lake or reservoir.
Forbes, L.K., Hocking, G.C.
core  

First Direct Observations of Internal Flow Structures in a Powder Snow Avalanche: Turbulence, Instability and Particle Distribution

Journal of Geophysical Research: Earth Surface, Volume 131, Issue 6, June 2026.
Abstract Powder snow avalanches are highly dynamic, multiphase gravity‐driven flows typically composed of a dense basal layer overlain by airborne layers in which snow particles are suspended within a turbulent air phase. Despite extensive work on related systems such as pyroclastic density currents and turbidity currents, all gravity current studies ...
I. Calic, F. Coletti, B. Sovilla
wiley   +1 more source

A Global, Daily Carbon Budget for Terrestrial Ecosystems Constrained by Satellite Observations of Soil Moisture: The SMAP Level 4 Carbon Product at Ten Years

Journal of Geophysical Research: Biogeosciences, Volume 131, Issue 6, June 2026.
Abstract The capacity of terrestrial ecosystems to retain carbon or sequester more atmospheric carbon is frequently investigated as a potential natural climate solution. However, global carbon inventories, national carbon assessments, and atmospheric inversion studies suffer from key limitations: infrequent estimates, low spatial resolution, or a lack ...
K. Arthur Endsley, John S. Kimball, Rolf H. Reichle, Joseph V. Ardizzone, Tobias Kundig, Thomas Colligan, Jens Heinke, Etsushi Kato, Jürgen Knauer, Lei Ma, Tobias Nützel, Qing Sun, Wenping Yuan   +12 more
wiley   +1 more source

Eruption Source Parameters in Volcanic Plume Modeling: Advances, Challenges, and Future Directions

Reviews of Geophysics, Volume 64, Issue 2, June 2026.
Abstract Accurately predicting the atmospheric dispersion of volcanic ash and gases is crucial for both scientific understanding and hazard mitigation. Estimating Eruption Source Parameters (ESP), such as mass eruption rate, plume height, duration, and particle size distribution and properties, remains challenging due to the complex nature of volcanic ...
A. Costa, A. Folch, Y. J. Suzuki, L. Mingari, G. Macedonio   +4 more
wiley   +1 more source

Flow and sedimentation of pyroclastic density currents: from large scale to boundary layer processes.

, 2015
Our Earth is a living Planet in which rocks are exhumed at the surface, and subjected to erosion, transport and deposition. Pyroclastic density currents (PDCs) concentrate all these steps in a single phenomenon.
Douillet, Guilhem Amin
core  

Towards the definition of AMS facies in the deposits of pyroclastic density currents [PDF]

, 2014
Anisotropy of magnetic susceptibility (AMS) provides a statistically robust technique to characterize the fabrics of deposits of pyroclastic density currents (PDCs).
Newkirk, T., Vilas, Juan Francisco A., Vazquez, J. A., Ort, M. H.   +3 more
core   +1 more source