Results 81 to 90 of about 16,412 (215)

Fluidization in pyroclastic flows

Powder Technology
Pyroclastic flows are mixtures of gas and particles generated by gravitational collapse of lava domes or fall-back of eruption columns during explosive eruptions. They are major natural hazards because they can propagate far away from the source at speeds that largely exceed those of most natural or anthropogenic granular flows.
Salatino, Piero, Bareschino, Piero, Marzocchella, Antonio, Petrosino, Paola   +3 more
openaire   +2 more sources

Teleseismic Radial Anisotropy Reveals a Sill‐Dominated Magma Reservoir Beneath the Valles Caldera, New Mexico

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract The Valles Caldera (VC), one of the largest Quaternary silicic calderas in North America, formed by explosive rhyolitic eruptions. Seismic studies suggest a crustal magmatic reservoir beneath the caldera with low‐velocity anomalies, but resolving the detailed geometry of localized melt requires constraints from seismic anisotropy.
Gaoshan Guo, Haiqiang Lan, Tao Xu, Qinya Liu   +3 more
wiley   +1 more source

Pyroclastic Flow Deposits and InSAR: Analysis of Long-Term Subsidence at Augustine Volcano, Alaska

Remote Sensing, 2016
Deformation of pyroclastic flow deposits begins almost immediately after emplacement, and continues thereafter for months or years. This study analyzes the extent, volume, thickness, and variability in pyroclastic flow deposits (PFDs) on Augustine ...
David B. McAlpin, Franz J. Meyer, Wenyu Gong, James E. Beget, Peter W. Webley   +4 more
doaj   +1 more source

Modeling the Transport and Dispersion of Volcanic Co‐PDC Ash Clouds Using NAME: An Evaluation of Source Geometry and Mass Eruption Rate

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 6, 28 March 2026.
Abstract Pyroclastic density currents (PDCs) are gravity currents that frequently form during explosive volcanic eruptions. These ground‐hugging density currents consist of high‐temperature mixtures of pyroclasts (e.g., ash, pumice), lithics, and gas.
M. Hagenbourger, F. M. Beckett, T. J. Jones, S. L. Engwell   +3 more
wiley   +1 more source

The fluidization behaviour of ignimbrite at high temperature and with mechanical agitation [PDF]

, 2004
Experiments were carried out to study the fluidization behaviour of ignimbrite at high temperature and while being mechanically agitated. Geldart group C behaviour occurs up to 565 degreesC when the material is subjected to increasing gas flow ( without ...
Bruni, G, Druitt, TH, Lettieri, P, Yates, JG   +3 more
core   +1 more source

Volcanic Ash Affected by Lightning During the Hunga 2022 Eruption

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 5, 16 March 2026.
Abstract The 15 January 2022 eruption of Hunga volcano (Kingdom of Tonga) produced the most lightning ever documented during an explosive eruption to date. This study estimates the mass of erupted tephra that may be structurally or electromagnetically affected by the lightning, based upon lightning peak current, channel length, and ash plume particle ...
Kimberly Genareau, Joali Paredes‐Mariño, Shane J. Cronin, Sebastian S. Harkema, Christopher J. Schultz, Kelley M. Murphy, Aaron R. Naeger   +6 more
wiley   +1 more source

Maars to calderas. End-members on a spectrum of explosive volcanic depressions [PDF]

, 2015
We discuss maar-diatremes and calderas as end-members on a spectrum of negative volcanic landforms (depressions) produced by explosive eruptions (note—we focus on calderas formed during explosive eruptions, recognizing that some caldera types are not ...
Palladino, Danilo Mauro, Sottili, Gianluca, Taddeucci, J., Valentine, G. A.   +3 more
core   +1 more source

The Neolithic Site of Piano dei Cardoni in the Island of Ustica (Italy): Minero‐Petrographic and Chemical Characterization of the Ceramic Finds and Clayey Raw Materials

Geoarchaeology, Volume 41, Issue 2, March/April 2026.
ABSTRACT This paper presents the results of minero‐petrographic and chemical analyses of pottery and potential local raw materials from Ustica, a small volcanic island off the coast of Palermo (Sicily), inhabited during the Middle Neolithic. Typologically, the pottery shows cultural connections to the Bicromica and Serra d'Alto traditions, linking ...
G. Montana, C. Speciale, G. Battaglia, L. Randazzo, G. Carnevale, M. V. Antonopoulou, A. Magrì   +6 more
wiley   +1 more source

Radon concentration anomalies as possible precursors to pyroclastic flow events of Arenal volcano [PDF]

Geofísica Internacional, 2002
Radon measurements were made at five stations located on Arenal volcano’s cone, Costa Rica, using LR-115 detectors. The radon measuring stations were located on the active cone and one station was located directly over a hotspring. Radon flux anomalies
E. Malavassi, E. Fernández, E. Duarte, J. R. García-Vindas   +3 more
doaj  

An ashy septingentenarian: the Kaharoa tephra turns 700 (with notes on its volcanological, archaeological, and historical importance) [PDF]

, 2014
Most of us are aware of the basaltic Tarawera eruption on 10th June 1886: the high toll on life (~120 people), landscape devastation, and loss of the Pink and White Terraces.
Lowe, David J., Pittari, Adrian
core   +1 more source