Results 41 to 50 of about 319,392 (290)

Variability in the Gas Composition of the Popocatépetl Volcanic Plume

Frontiers in Earth Science, 2019
Long term time series of volcanic plumes composition constitute valuable indicators of the evolution of the magmatic and volcanic systems. We present here a 4 years long time series of molecular ratios of HF/HCl, HCl/SO2 , SiF4 /SO2 , HF/SiF4 measured in
N. Taquet, W. Stremme, M. Grutter, J. Baylón, A. Bezanilla, B. Schiavo, C. Rivera, R. Campion, T. Boulesteix, Amiel Nieto-Torres, R. Espinasa-Pereña, T. Blumenstock, F. Hase   +12 more
semanticscholar   +1 more source

Seismic Data, Photographic Images and Physical Modeling of Volcanic Plumes as a Tool for Monitoring the Activity of Nevado del Ruiz Volcano, Colombia

Frontiers in Earth Science, 2018
Quantification of volcanic plume parameters is a fundamental task to characterize the behavior of an active volcano. The volcanic plume mass, flow rate and ash injection were determined from seismic data, in addition to photographic images and ...
John Makario Londono, John Makario Londono, Beatriz Galvis, Beatriz Galvis   +3 more
doaj   +1 more source

Plume-SPH 1.0: a three-dimensional, dusty-gas volcanic plume model based on smoothed particle hydrodynamics [PDF]

Geoscientific Model Development, 2018
Plume-SPH provides the first particle-based simulation of volcanic plumes. Smoothed particle hydrodynamics (SPH) has several advantages over currently used mesh-based methods in modeling of multiphase free boundary flows like volcanic plumes.
Z. Cao, A. Patra, M. Bursik, E. B. Pitman, M. Jones   +4 more
doaj   +1 more source

Measurement of three dimensional volcanic plume properties using multiple ground based infrared cameras

Isprs Journal of Photogrammetry and Remote Sensing, 2019
This study presents a method and a proof of principle system for the direct measurement of volcanic plume 3-D spatial properties. The shape of a plume is reconstructed in three dimensions using multi-view imagery collected from static ground-based ...
K. Wood, H. Thomas, Matt Watson, A. Calway, T. Richardson, K. Stebel, A. Naismith, L. Berthoud, J. Lucas   +8 more
semanticscholar   +1 more source

Electrical Charging of Volcanic Plumes

Space Science Reviews, 2008
Many explosive terrestrial volcanic eruptions are accompanied by lightning and other atmospheric electrical phenomena. The plumes produced generate large perturbations in the surface atmospheric electric potential gradient and high charge densities have been measured on falling volcanic ash particles.
James, M. R., Wilson, L., Lane, Stephen, Gilbert, J. S., Mather, T. A., Harrison, R. G., Martin, R. S.   +6 more
openaire   +1 more source

SO₂ depletion in tropospheric volcanic plumes [PDF]

Geophysical Research Letters, 2004
Ground based remote sensing techniques are used to measure volcanic SO2 fluxes in efforts to characterise volcanic activity. As these measurements are made several km from source there is the potential for in‐plume chemical transformation of SO2 to sulphate aerosol (conversion rates are dependent on meteorological conditions), complicating ...
McGonigle, Andrew, Delmelle, Pierre, Oppenheimer, Clive, Tsanev, Vitchko, Delfosse, Thomas, Williams-Jones, Glyn, Horton, Keith, Mather, Tamsin   +7 more
openaire   +2 more sources

Quantifying the Effect of Wind on Volcanic Plumes: Implications for Plume Modeling

Journal of Geophysical Research: Atmospheres, 2023
AbstractThe considerable effects that wind can have on estimates of mass eruption rates (MERs) in explosive eruptions based on volcanic plume height are well known but difficult to quantify rigorously. Many explicitly wind‐affected plume models have the additional difficulty that they require the use of centerline heights of bent‐over plumes, a ...
Tobias Dürig, Magnús T. Gudmundsson, Fabio Dioguardi, Louise Steffensen Schmidt   +3 more
openaire   +4 more sources

Evaluating the structure and magnitude of the ash plume during the initial phase of the 2010 Eyjafjallajökull eruption using lidar observations and NAME simulations [PDF]

, 2011
The Eyjafjallajökull volcano in Iceland erupted explosively on 14 April 2010, emitting a plume of ash into the atmosphere. The ash was transported from Iceland toward Europe where mostly cloud-free skies allowed ground-based lidars at Chilbolton in ...
A. Ansmann, A. L. M. Grant, Ansmann, Arason, B. J. Devenish, Bonadonna, Bonadonna, Casadevall, Clarisse, Clarisse, D. J. Thomson, Durant, F. Marenco, Folch, Gangale, Guffanti, H. F. Dacre, Harrison, Heffter, Hobbs, Holasek, I. Mattis, J. M. Haywood, James, Jones, L. Clarisse, Leadbetter, M. C. Hort, Maryon, Mastin, R. J. Hogan, Rose, S. E. Belcher, Schneider, Sparks, Webley, Webster, Wilson, Witham   +38 more
core   +1 more source

First In Situ Observations of Gaseous Volcanic Plume Electrification

Geophysical Research Letters, 2019
Volcanic plumes become electrically charged, often producing spectacular displays of lightning. Previous research has focused on understanding volcanic lightning, primarily the large electric fields produced by charging of ash particles.
K. Nicoll, M. Airey, C. Cimarelli, A. Bennett, G. Harrison, D. Gaudin, K. Aplin, K. Koh, M. Knuever, G. Marlton   +9 more
semanticscholar   +1 more source

Atmospheric chemistry in volcanic plumes [PDF]

Proceedings of the National Academy of Sciences, 2010
Recent field observations have shown that the atmospheric plumes of quiescently degassing volcanoes are chemically very active, pointing to the role of chemical cycles involving halogen species and heterogeneous reactions on aerosol particles that have previously been unexplored for this type of volcanic plumes.
openaire   +3 more sources