Identifying rheological regimes within pyroclastic density currents. [PDF]
Nat CommunAbstractPyroclastic 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 +4 more
europepmc +10 more sources
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 +4 more sources
Pyroclastic Density Currents: State of the Art and Perspectives
Journal of Volcanology and Geothermal Research, 2014 Pyroclastic density currents (PDCs) are mixtures of two components, namely solid particles and fluid (gas) phase. They macroscopically behave as dense, multiphase gravity currents (flowing pyroclastic mixtures of particles and gas) immersed in a less dense, almost isotropic fluid (the atmosphere).
Pierfrancesco Dellino +2 more
exaly +5 more sources
The fragmentation-induced fluidisation of pyroclastic density currents. [PDF]
Nat Commun, 2023 AbstractPyroclastic density currents (PDCs) are the most lethal volcanic process on Earth. Forecasting their inundation area is essential to mitigate their risk, but existing models are limited by our poor understanding of their dynamics. Here, we explore the role of evolving grain-size distribution in controlling the runout of the most common PDCs ...
Breard ECP +5 more
europepmc +5 more sources
Inverting sediment bedforms for evaluating the hazard of dilute pyroclastic density currents in the field. [PDF]
Sci Rep, 2021 Pyroclastic density currents are ground hugging gas-particle flows associated to explosive volcanic eruptions and moving down a volcano's slope, causing devastation and deaths.
Dellino P +4 more
europepmc +2 more sources
The impact of pyroclastic density currents duration on humans: the case of the AD 79 eruption of Vesuvius. [PDF]
Sci Rep, 2021 Pyroclastic density currents are ground hugging gas-particle flows that originate from the collapse of an eruption column or lava dome. They move away from the volcano at high speed, causing devastation.
Dellino P +4 more
europepmc +2 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 +9 more
openaire +2 more sources
Sedimentology and geomorphology of the deposits from the August 2006 pyroclastic density currents at Tungurahua volcano, Ecuador. [PDF]
Bull Volcanol, 2013 The deposits of the pyroclastic density currents from the August 2006 eruption of Tungurahua show three facies associations depending on the topographic setting: the massive, proximal cross-stratified, and distal cross-stratified facies.
Douillet GA +13 more
europepmc +3 more sources
Generation of Overspill Pyroclastic Density Currents
, 2021 Pyroclastic density currents (PDCs) are composed of hot gas and glass like ash or rocks. They can be very mobile, flowing over obstacles with ease but their pathway is often controlled by the topography they flow over. When a PDC is confined to valley it increases the distance it can travel but the PDC can overflow from the valley unexpectedly ...
Allison Kubo Hutchison, Josef Dufek
openaire +3 more sources
Permian Large Igneous Provinces and Their Paleoenvironmental Effects
Geophysical Monograph Series, Page 417-434., 2021 Exploring the links between Large Igneous Provinces and dramatic environmental impact
An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Jun Chen, Yi‐Gang Xu
wiley +7 more sources