Results 61 to 70 of about 1,522 (205)

Residential building and occupant vulnerability to pyroclastic density currents in explosive eruptions [PDF]

Natural Hazards and Earth System Sciences, 2007
A major hazard during the eruption of explosive volcanoes is the formation of pyroclastic density currents (PDCs). Casualties and physical building damage from PDCs are caused by the temperature, pressure, and particle load of the flow.
R. Spence, I. Kelman, I. Kelman, A. Brown, G. Toyos, D. Purser, P. Baxter   +6 more
doaj  

Evolution of Rajabasa Volcano in Kalianda Area and Its Vicinity, South Lampung Regency

Indonesian Journal on Geoscience, 2014
DOI: 10.17014/ijog.v7i1.132Rajabasa Volcano (± 1281 m) and Lampung Tuff, located in the South Lampung Regency, is the main point in order to understand the evolution of Quaternary volcanism in the area.
Sutikno Bronto, P. Asmoro, G. Hartono, Sulistiyono Sulistiyono   +3 more
doaj   +1 more source

Distribution and stratigraphy of deposits produced by diluted pyroclastic density currents of the 1982 eruption of El Chichón volcano, Chiapas, Mexico

Revista Mexicana de Ciencias Geológicas, 2018
The March 29 to April 4, 1982 eruption of El Chichón volcano in southeastern Mexico was characterized by a complex interplay between magmatic and phreatomagmatic eruptive events, that were responsible for the generation of plinian columns and ...
Teresa Scolamacchia, José Luis Macías
doaj  

Investigation of variable aeration of monodisperse mixtures: implications for pyroclastic density currents [PDF]

Bulletin of Volcanology, 2018
The high mobility of dense pyroclastic density currents (PDCs) is commonly attributed to high gas pore pressures. However, the influence of spatial and temporal variations in pore pressure within PDCs has yet to be investigated. Theory suggests that variability in the fluidisation and aeration of a current will have a significant control on PDC flow ...
Rowley, Pete, Smith, Gregory M., Williams, Rebecca, Parsons, Daniel R.   +3 more
openaire   +4 more sources

Assessment of motion-induced fluidization of dense pyroclastic gravity currents

Annals of Geophysics, 2005
The paper addresses some fundamental aspects of the dynamics of dense granular flows down inclines relevant to pyroclastic density currents. A simple mechanistic framework is presented to analyze the dynamics of the frontal zone, with a focus ...
P. Salatino
doaj   +1 more source

Dynamics and Deposits of Pyroclastic Density Currents in Magmatic and Phreatomagmatic Eruptions Revealed by a Two‐Layer Depth‐Averaged Model

Geophysical Research Letters, 2023
A pyroclastic density current (PDC) is characterized by its strong stratification of particle concentration; it consists of upper dilute and lower dense currents, which generally control the dynamics and deposits of PDCs, respectively.
Hiroyuki A. Shimizu, Takehiro Koyaguchi, Yujiro J. Suzuki   +2 more
doaj   +1 more source

Pyroclastic dune bedforms: macroscale structures and lateral variations. Examples from the 2006 pyroclastic currents at Tungurahua (Ecuador).

, 2018
Pyroclastic currents are catastrophic flows of gas and particles triggered by explosive volcanic eruptions. For much of their dynamics, they behave as particulate density currents and share similarities with turbidity currents.
Bernard, Benjamin, Hoelscher, Inga, Guilhem Amin Douillet, Ulrich Kueppers, Schlunegger, Fritz, Dingwell, Donald B., Mélanie Bouysson, Douillet, Guilhem Amin, Célia Mato, Ritz, Vanille, Inga Hoelscher, Kueppers, Ulrich, Gegg, Lukas, Douillet, Guilhem A., Bouysson, Mélanie, Benjamin Bernard, Chaffaut, Quentin, Ritz, Vanille; id_orcid, Vanille Ritz, Witting, Patrick, Vanille Ariane Ritz, Donald Bruce Dingwell, Dingwell, Donald B, Mato, Célia, Quentin Chaffaut, Fritz Schlunegger, Lukas Gegg, Patrick Witting   +27 more
core   +1 more source

Long-term hazard of pyroclastic density currents at Vesuvius (Southern Italy) with maps of impact parameters [PDF]

Natural Hazards and Earth System Sciences
The hazard of pyroclastic density currents (PDCs) at Vesuvius is investigated by analysing deposits from past eruptions. No specific eruption was chosen as representative of the hazard of PDCs, and the analysis is extended to all the eruptions that left ...
P. Dellino, F. Dioguardi, R. Sulpizio, R. Sulpizio, R. Sulpizio, D. Mele   +5 more
doaj   +1 more source

Probabilistic Volcanic Hazard Assessment for Pyroclastic Density Currents From Pumice Cone Eruptions at Aluto Volcano, Ethiopia

Frontiers in Earth Science, 2020
Aluto volcano, in the Main Ethiopian Rift, is a peralkaline caldera system, which comprises conglomerations of rhyolite (obsidian) lavas and enigmatic pumice cones.
Ben Clarke, Ben Clarke, Pablo Tierz, Pablo Tierz, Eliza Calder, Gezahegn Yirgu   +5 more
doaj   +1 more source

Building a Continental‐Scale Geodetic Network: The Plate Boundary Observatory (PBO)

Perspectives of Earth and Space Scientists, Volume 7, Issue 1, December 2026.
Abstract The Plate Boundary Observatory (PBO) transformed the use of geodesy in North America to study crustal deformation and plate boundary processes by establishing a continental‐scale, standardized, open‐access geodetic network. Built and operated by UNAVCO between 2003 and 2018 as part of the National Science Foundation (NSF)‐funded EarthScope ...
Emily E. Zawacki, Michael E. Jackson, Glen S. Mattioli, David J. Mencin, Karl Feaux, Donna J. Charlevoix   +5 more
wiley   +1 more source