Results 11 to 20 of about 1,257 (218)

A Confidence-Based Assessment Method for Distinguishing Pyroclastic Density Current Deposits From Other Volcaniclastic Units

Frontiers in Earth Science, 2020
Pyroclastic density currents (PDCs) are a destructive volcanic hazard. Quantifying the types, frequency and magnitudes of PDC events is essential for effective risk management, but since historical records at best extend a few hundred years this usually ...
James Cowlyn, James Cowlyn, Ben M. Kennedy, Darren M. Gravley, Shane J. Cronin   +4 more
doaj   +1 more source

Identifying rheological regimes within pyroclastic density currents. [PDF]

Nat Commun
AbstractPyroclastic density currents (PDCs) are the most lethal of all volcanic hazards. An ongoing challenge is to accurately forecast their run-out distance such that effective mitigation strategies can be implemented. Central to this goal is an understanding of the flow mobility—a quantitative rheological model detailing how the high temperature gas-
Jones TJ, Shetty A, Chalk C, Dufek J, Gonnermann HM.   +4 more
europepmc   +4 more sources

Spontaneous Unsteadiness and Sorting in Pyroclastic Density Currents and their Deposits [PDF]

, 2023
Pyroclastic density currents (PDCs) pose substantial risk to populations living on and around active volcanoes, but their structure and internal dynamics are poorly understood. Much of this understanding is derived from interpretation of their widespread deposits.
Pete Rowley, Rebecca Williams, Matthew Johnson, Thomas Johnston, Natasha Dowey, Daniel Parsons, Alison Provost, Olivier Roche, Gregory Smith, Nemi Walding   +9 more
openaire   +1 more source

Eruption Style, Emplacement Dynamics and Geometry of Peralkaline Ignimbrites: Insights From the Lajes-Angra Ignimbrite Formation, Terceira Island, Azores

Frontiers in Earth Science, 2021
Ignimbrites are relatively uncommon on ocean island volcanoes and yet they constitute a significant portion of the stratigraphy of Terceira Island (Azores). The Lajes-Angra Ignimbrite Formation (ca.
Adriano Pimentel, Adriano Pimentel, Stephen Self, José M. Pacheco, Adam J. Jeffery, Ralf Gertisser   +5 more
doaj   +1 more source

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
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 Density Current Hazard Assessment and Modeling Uncertainties for Fuego Volcano, Guatemala

Remote Sensing, 2020
On 3 June 2018, Fuego volcano experienced a VEI = 3 eruption, which produced a pyroclastic density current (PDC) that devastated the La Réunion resort and the community of Los Lotes, resulting in over 100 deaths.
Ian T. W. Flynn, Michael S. Ramsey
doaj   +1 more source

Patterns of deposition from experimental turbidity currents with reversing buoyancy [PDF]

, 2010
Turbidity currents are turbulent, sediment-laden gravity currents which can be generated in relatively shallow shelf settings and travel downslope before spreading out across deep-water abyssal plains.
Pritchard, David, Gladstone, CHARLOTTE, Gladstone, C.   +2 more
core   +1 more source

Pyroclastic density currents associated with the 2015 phreatomagmatic eruption of the Kuchinoerabujima volcano

Earth, Planets and Space, 2018
A pyroclastic density current (PDC) was observed with the phreatomagmatic eruption of the Kuchinoerabujima volcano, southern Japan, on May 29, 2015. The PDC flowed down in all direction from the source crater, forming three major branches.
Nobuo Geshi, Jun’ichi Itoh
doaj   +1 more source

Reconstruction of the 29th December 2013 Eruption of San Miguel Volcano, El Salvador, using Video, Photographs and Pyroclastic Deposits

Volcanica, 2022
San Miguel (or Chaparrastique) volcano, El Salvador, erupted on the 29th December 2013, after almost 40 years of quiescence. Initial vent-clearing explosions ejected ballistic blocks and produced a pyroclastic density current (PDC) that flowed down the ...
Richard James Brown, Walter Hernández, Demetrio Escobar, Eduardo Gutierrez, Julia Crummy, Rosemary Cole, Pierre-Yves Tournigand   +6 more
doaj   +1 more source