Results 1 to 10 of about 312 (111)
Reconciling Pyroclastic Flow and Surge: The Multiphase Physics of Pyroclastic Density Currents [PDF]
Earth and Planetary Science Letters, 2002 Two end-member types of pyroclastic density current are commonly recognized: pyroclastic surges are dilute currents in which particles are carried in turbulent suspension and pyroclastic flows are highly concentrated flows. We provide scaling relations that unify these end-members and derive a segregation mechanism into basal concentrated flow and ...
George Bergantz, Alain Burgisser
exaly +3 more sources
Applied Sciences (Switzerland), 2017 Volcanic eruptions cause pyroclastic flows, which can destroy plantations and settlements. We used image data from Landsat 7 Bands 7, 4 and 2 and Landsat 8 Bands 7, 5 and 3 to observe and analyze the distribution of pyroclastic flow deposits for two ...
Changwook Lee, Prima Kadavi
exaly +3 more sources
Topographical Controls on Small-Volume Pyroclastic Flows
Sedimentology, 2019 Abstract Emplacement of small‐volume (<0·1 km 3 ) pyroclastic flows is significantly influenced by topography. The Arico ignimbrite on Tenerife (Canary Islands) is a characteristic small‐volume pyroclastic flow deposit emplaced on high relief topography.
Domenico M Doronzo +2 more
exaly +3 more sources
IMEX_SfloW2D v2: a depth-averaged numerical flow model for volcanic gas–particle flows over complex topographies and water [PDF]
Geoscientific Model Development, 2023 We present developments to the physical model and the open-source numerical code IMEX_SfloW2D (de' Michieli Vitturi et al., 2019). These developments consist of a generalization of the depth-averaged (shallow-water) fluid equations to describe a ...
M. de' Michieli Vitturi +2 more
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Forum Geografi, 2021 Internal temperature variations of pyroclastic flows and their deposits are arguably the most challenging data to acquire. As a preliminary study of the temperature variation inside pyroclastic flows, the remains of Onokoba Elementary School (Shimabara ...
Balázs Bradák +3 more
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A Unifying Model for Pyroclastic Surge Genesis and Pyroclastic Flow Fluidization
Geophysical Research Letters, 2022 AbstractPyroclastic density currents (PDCs) are hot and fast ground‐hugging mixtures of volcanic fragments and gases, which represent a major threat to people living near explosive volcanoes. Mechanisms causing the separation into the concentrated (the pyroclastic flow) and dilute (the pyroclastic surge) layers, as well as the mechanism causing their ...
Kelfoun, Karim, Gueugneau, Valentin
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Abrasion in pyroclastic flows [PDF]
Geologische Rundschau, 1992 The relative size of glass rims coating crystals in the matrix ash provides a semi-quantitative measure of abrasion of ash grains in pyroclastic flows. Median abrasion indices (= areacrystal / areaglass rim) are 8.4 to 18.5 in Laacher See pyroclastic flow units but only 4 to 6.3 in assocciated fallout, showing stronger abrasion of ash particles in the ...
Schmincke, H.-U., Freundt, A.
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Geosciences, 2020 Snow avalanches are catastrophic phenomena because of their destructive power. Therefore, it is very important to forecast the affected area of snow avalanches using numerical simulations.
Kae Tsunematsu +2 more
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New developments in the analysis of column-collapse pyroclastic density currents through numerical simulations of multiphase flows [PDF]
Solid Earth, 2012 A granular multiphase model has been used to evaluate the action of differently sized particles on the dynamics of fountains and associated pyroclastic density currents.
S. Lepore, C. Scarpati
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Geosciences, 2021 Evidence of volcaniclastic sedimentation occurs in the first depositional sequence of the sedimentary succession of the Amantea Basin. Volcaniclastic deposits are intercalated in the upper part of a sandstone formation and these show a maximum thickness ...
Cannata Chiara Benedetta +4 more
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