Results 51 to 60 of about 3,985 (225)

Genetic and Ecological Management of Pacific Salmon Fisheries for the 21st Century

Fisheries Management and Ecology, EarlyView.
ABSTRACT Based on ecological adaptation theory, tremendous effort is being spent on measures that are eliminating salmon hatcheries and fishing opportunities with the intention of protecting wild runs deemed to be of particular genetic importance to the survival of the species.
Randall E. Brummett, Ian G. Cowx, Devin M. Bartley   +2 more
wiley   +1 more source

The impact of volcanic eruption rate on pyroclastic hazard

Communications Earth & Environment
Pyroclastic density currents – fast flows of hot gases, ash, and debris – are some of the most hazardous phenomena associated with explosive volcanic eruptions.
Domenico M. Doronzo
doaj   +1 more source

New data on the neogene volcano-sedimentary complex of the Icha Depression: the Tyrkachyn section (Western Kamchatka)

Вестник Камчатской региональной ассоциации "Учебно-научный центр". Серия: Науки о Земле, 2022
In the 90-m river bank of the middle reaches of the Icha River, thick strata of volcano-sedimentary deposits represented by pyroclastic rocks and siliceous tuffites with layers of diatomites were studied. Representative diatom assemblages assigned to the
Oreshkina T.V., Pevzner M.M., Petrova V.V., Karimov T.D.   +3 more
doaj   +1 more source

Resolving Micrometre‐Scale Zircon Growth in Silicic Systems by 7 μm LA‐MC‐ICP‐MS U‐Pb Dating: Linking Petrology and Geochronology in Silicic Volcanic and Granitic Rocks from Victoria, Australia

Geostandards and Geoanalytical Research, EarlyView.
Key Points 7 μm spot‐diameter LA‐MC‐ICP‐MS analyses yield accurate zircon U‐Pb ages. 1013 Ω amplifier resistors improve low‐signal Pb measurements. Saturn correction protocols minimise down‐hole fractionation effects. We present a systematic evaluation of high spatial‐resolution zircon U‐Pb dating using a Thermo Scientific Neoma multi‐collector ICP‐MS ...
Cristiano Lana, John D. Clemens
wiley   +1 more source

Entrance of hot pyroclastic flows into the sea: Experimental observations

, 2003
The entrance of hot pyroclastic flows into water has been observed in a series of experiments in which shooting granular flows of hot ignimbrite ash (≤403 °C), of bulk density near that of water, run down a smooth chute and enter a water-filled tank at ...
Freundt, Armin
core   +1 more source

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

Varying effects of stream restoration on riparian soil carbon persistence and methane emissions in the southern Rocky Mountains, United States

Restoration Ecology, EarlyView.
Abstract Introduction Channel incision can disconnect streams from their floodplains, potentially depleting carbon (C) in riparian soils by stimulating microbial decomposition. Stream restoration may offer an opportunity to replenish soil C pools by saturating riparian soils with water and slowing microbial activity.
Alexander H. Krichels, Alina Vulcan, Katelyn P. Driscoll   +2 more
wiley   +1 more source

Deposits from dome-collapse and fountain-collapse pyroclastic flows at Soufriere Hills Volcano, Montserrat

, 2002
Pyroclastic flows were formed at Soufrière Hills Volcano by lava-dome collapse and by fountain collapse associated with Vulcanian explosions. Major episodes of dome collapse, lasting tens of minutes to a few hours, followed escalating patterns of ...
Cole, P. D., Calder, E. S., Young, S. R., Harford, C. L., Norton, G. E., Clarke, A. B., Sparks, R. S. J., Druitt, T. H., Herd, R. A.   +8 more
core   +1 more source

A review of the supercritical state of eruption‐fed volcanic density currents in subaerial and subaqueous settings

Sedimentology, EarlyView.
ABSTRACT Subaerial Pyroclastic Density Currents (PDCs) and Subaqueous Eruption‐Fed Density Currents (SEFDCs) produced during volcanic eruptions can present major hazards to surrounding communities and ecosystems. The bedforms deposited by these volcanic density currents can provide insights into the nature of transport and depositional processes, which
Shannon E. Frey, Martin Jutzeler, Rebecca J. Carey   +2 more
wiley   +1 more source

Pyroclastic flows of the 1883 Krakatau eruption

, 1991
The nature of the submarine deposits produced by the 1883 Krakatau eruption in Indonesia has remained controversial for more than a century. Knowledge of their character, however, is critical to understanding the origin of the devastating tsunamis ...
Sutikno Bronto, Charles Mandeville, Sigurdsson, Haraldur, Carey, Steven, Mandeville, Charles, Steven Carey, Bronto, Sutikno, Haraldur Sigurdsson   +7 more
core   +1 more source