Results 91 to 100 of about 5,469 (201)

Sedimentation and mobility of PDCs: a reappraisal of ignimbrites’ aspect ratio

Scientific Reports, 2017
The aspect ratio of ignimbrites is a commonly used parameter that has been related to the energy of the parent pyroclastic density currents (PDCs). However this parameter, calculated as the ratio between the average thickness and the average lateral ...
Guido Giordano, Domenico M. Doronzo
doaj   +1 more source

Volcaniclastites as a key for geodynamic constraints in the evolution of the central-western Mediterranean region: an overview [PDF]

, 2016
In the central-western peri-Mediterranean chains, a consistent latest Chattian-Langhian orogenic calc-alkaline magmatism generated a high amount of volcaniclastites interbedded within penecontemporaneous marine successions.
Guerrera, Francesco, Martín-Martín, Manuel, Raffaelli, Giuliana, Tramontana, Mario   +3 more
core   +1 more source

Probabilistic hazard maps of dilute pyroclastic density current at Vesuvius

, 2023
Dilute pyroclastic density currents are one major source of hazard at Vesuvius. By combining data of deposits of the explosive eruptions of the last six thousand years and interpolating data of impact parameters (Velocity, Density, particle volumetric concentration, temperature, dynamic pressure), which were calculated by modeling the currents as ...
Dellino, P., Mele, D., Sulpizio, R., Dioguardi, F.   +3 more
openaire   +2 more sources

Large explosive eruptions may be dominated by pyroclastic flows instead of buoyant plumes: insights from a global data compilation

Journal of Applied Volcanology
The dynamics of Earth’s largest, most voluminous eruptions (≥ 100 km3 ejecta; VEI 7) are poorly understood. Here, we explore the question of whether these very large eruptions can be treated as scaled-up versions of moderate volume historical eruptions ...
Alice R. Paine, Fabian B. Wadsworth
doaj   +1 more source

Analysis of the 4 December 2021 lahar on Mount Semeru using optical and SAR remote sensing

International Journal of Applied Earth Observations and Geoinformation
This study characterizes the amplitude changes associated with the 4 December 2021 eruption of Mount Semeru and maps the resulting deposits using Sentinel-1 SAR backscatter and PlanetScope optical imagery.
Samuel McGowan, Jonathan Procter, Gabor Kereszturi, Fabien Albino, Indranova Suhendro   +4 more
doaj   +1 more source

Igneous processes within late Precambrian volcanic centres near Whitwick, northwestern Charnwood Forest [PDF]

, 2000
Precambrian rocks in northwestern Chamwood Forest differ markedly from their lateral equivalents to the east and south. They are subdivided into the Whitwick Volcanic Complex, of massive to intensely brecciated high-silica andesites and porphyritic ...
Carney, John
core  

Rapid caldera subsidence and fluctuating eruption dynamics: the lithostratigraphy and structure of the Loch Bà Caldera, Isle of Mull, NW Scotland

Volcanica
Caldera-forming eruptions represent extremely hazardous events. The Loch Bà Caldera on the Isle of Mull, NW Scotland, preserves an ~120 m thick sequence of Palaeogene silicic pyroclastic rocks and collapse breccias.
Peter Nicholls, David Brown, Ross Dymock
doaj   +1 more source

Pyroclastic density currents associated with the 2008-2009 eruption of Chaitén Volcano (Chile): Forest disturbances, deposits, and dynamics

Andean Geology, 2013
Explosive activity at Chaitén Volcano in May 2008 and subsequent dome collapses over the following nine months triggered multiple, small-volume pyroclastic density currents (PDCs).
Jon J. Major, Thomas C. Pierson, Richard P. Hoblitt, Hugo Moreno   +3 more
doaj   +1 more source

Unraveling pyroclastic density current dynamics with multiparameter geophysical sensing

Communications Earth & Environment
Detecting, locating, and characterising the dynamics of destabilised volcanic material is critical for assessing the extreme hazards posed by volcanic mass flows, such as pyroclastic density currents.
Francesco Biagioli, Jean-Philippe Métaxian, Eléonore Stutzmann, Pascal Bernard, Giorgio Lacanna, Anne Mangeney, Giacomo Ulivieri, Gilda Risica, Alister Trabattoni, Marc Peruzzetto, Lorenzo Innocenti, Maurizio Ripepe   +11 more
doaj   +1 more source

Pumice cone eruptions at Aluto volcano, Ethiopia

Volcanica
Pumice cones are volcanic landforms that exist worldwide, but whose eruption has never been observed. Interpretations of these eruptions vary significantly in style, intensity, and magnitude, pertinent for volcanic hazard assessment.
Ben Clarke, Eliza S. Calder, Karen Fontijn, Firawalin Desalegn, Pablo Tierz, Gezahegn Yirgu   +5 more
doaj   +1 more source