Results 91 to 100 of about 1,522 (205)

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

Investigating Technology and Raw Materials Source of the Archaic and Classical Architectural Terracottas From the Athenaion in Castro (Apulia, Italy)

Archaeometry, Volume 68, Issue 3, Page 512-526, June 2026.
ABSTRACT Since 2000, archaeological excavations have brought to light the sanctuary of Athena in Castro (Apulia, Italy), including terracotta roofs dated between the 6th and 4th centuries bce. Based on their morphological and stylistic features, it is suggested that the terracotta items were manufactured in the Greek colony of Taras (modern Taranto ...
M. M. N. Franceschini, T. Ismaelli, S. Vettori, L. Chelazzi, S. Ciattini, F. Di Benedetto, C. Grifa, E. Cantisani   +7 more
wiley   +1 more source

The Entrainment Rate of Non‐Boussinesq Hazardous Geophysical Gas‐Particle Flows: An Experimental Model With Application to Pyroclastic Density Currents [PDF]

, 2019
The entrainment rate of pyroclastic density currents is investigated by large‐scale experiments. The ground flows are initiated by the impact on the terrain of a dense gas‐particle fountain issuing from a cylindrical conduit, similarly to natural ...
F. Dioguardi, Dellino, Pierfrancesco, D. Mele, Dioguardi, F., Pierfrancesco Dellino, P. Dellino, Mele, D., Dellino, P., Daniela Mele, Domenico Maria Doronzo, Doronzo, Domenico Maria, D. M. Doronzo, Mele, Daniela, Fabio Dioguardi, Doronzo, D.M.   +14 more
core   +1 more source

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

Influence of the Dynamic Geological History of the Japanese Archipelago on the Molecular Phylogeography of the Riffle Beetle Zaitzeviaria ovata (Coleoptera: Elmidae)

Freshwater Biology, Volume 71, Issue 6, June 2026.
ABSTRACT The geographic genetic structure and distribution within species are shaped by factors such as dynamic tectonic activity and topographic changes associated with climate change. We used the largely flightless, freshwater‐dependent beetle Zaitzeviaria ovata (Elmidae) as a model to investigate how ancient topography and dynamic geological history
Takumi Yoshida, Masakazu Hayashi, Masaki Takenaka, Koji Tojo   +3 more
wiley   +1 more source

Interaction between pyroclastic density currents and buildings: Numerical simulation and first experiments

, 2011
The interaction between pyroclastic density currents and buildings is investigated by means of numerical simulation and large-scale experiments. Numerical simulation is performed with the Euler-Lagrange approach using a two-way coupling between gas and ...
DORONZO, DELLINO, Pierfrancesco
core   +1 more source

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

Processes and deposits of submarine sediment density flows within the Moroccan turbidite system, offshore NW Africa [PDF]

, 2012
Submarine sediment density flows are a major process for transporting sediment from the continental shelf to the deep-ocean. Understanding submarine flow dynamics relies upon analysis of their deposits (beds) because monitoring them directly is difficult.
Stevenson, Christopher John
core