Results 41 to 50 of about 3,592,930 (158)

Radon concentration anomalies as possible precursors to pyroclastic flow events of Arenal volcano [PDF]

Geofísica Internacional, 2002
Radon measurements were made at five stations located on Arenal volcano’s cone, Costa Rica, using LR-115 detectors. The radon measuring stations were located on the active cone and one station was located directly over a hotspring. Radon flux anomalies
E. Malavassi, E. Fernández, E. Duarte, J. R. García-Vindas   +3 more
doaj  

A Fluidisation Mechanism for Secondary Hydroeruptions in Pyroclastic Flow Deposits

Frontiers in Earth Science, 2020
Heating of water under hot pyroclastic flow deposits can drive hydroeruptions, forming craters and aprons of secondary deposits. According to the established conceptual model, steam pressure builds until failure of the pyroclastic overburden and a ...
M. A. Gilbertson, A. Taylor, S. J. Mitchell, A. C. Rust   +3 more
doaj   +1 more source

Carbon isotope geochemistry of organic matter in volcanic paleosols constrains paleo‐environmental variations

Journal of Quaternary Science, EarlyView.
ABSTRACT The Fiorano quarry paleosol developed within the Colli Albani volcanic district (Italy) in the time interval bracketed by the deposition of the Pozzolanelle pyroclastic‐flow unit (365 ± 4 ka) and the emplacement of the Capo di Bove lava flow (277 ± 2 ka).
Eduardo Di Marcantonio, Luca Aldega, Luigi Dallai, Mario Gaeta, Fabrizio Marra   +4 more
wiley   +1 more source

An Open Database of Lunar Regolith and Simulants Properties

International Journal for Numerical and Analytical Methods in Geomechanics, EarlyView.
ABSTRACT Lunar regolith, the layer of unconsolidated material covering the Moon's surface, is central to the science and technology developed for the Moon, notably related to in‐situ science investigations, resource utilization, surface infrastructure, and mobility systems.
Léonie Gasteiner, Naomi Murdoch, Olfa D'Angelo   +2 more
wiley   +1 more source

Rare Earth Element Potential in the Araí Rift Metavolcanic, Central Brazil: Gamma‐Ray Signatures, Mineralogy and Exploration Implications

Terra Nova, EarlyView.
ABSTRACT Although central Brazil hosts significant ion‐adsorption rare earth element (REE) deposits associated with A‐type granites, their coeval volcanic counterparts have been largely overlooked as exploration targets. This study demonstrates that acidic metavolcanic rocks of the Araí Group share strong radiometric, geochemical and mineralogical ...
Yuri Ribeiro, Nilson Francisquini Botelho, Valmir da Silva Souza, Diego Guilherme da Costa Gomes   +3 more
wiley   +1 more source

Energy facies. A global view of pyroclastic currents from vent to deposit

, 2022
Pyroclastic currents are described as gravity currents, and the classic conceptual model gives a first-order importance to the density of such currents.
Giordano, Guido, Palladino, Danilo Mauro, Guido Giordano, Palladino, DM, Giordano, G, Doronzo, DM, Doronzo, Domenico M, Domenico M. Doronzo, Danilo M. Palladino   +8 more
core   +1 more source

Analysis of slope failure mechanism in unsaturated pyroclastic soils, based on testing site monitoring [PDF]

, 2009
In the Campania region the pyroclastic soils resting on the limestone massif are often affected by mudflows. These landslides involve more superficial deposits, products of the volcanic eruption of the districts: Campi Flegrei and Somma Vesuvius.
Pirone, Marianna
core   +1 more source

Pyroclastic Flow Deposits and InSAR: Analysis of Long-Term Subsidence at Augustine Volcano, Alaska

Remote Sensing, 2016
Deformation of pyroclastic flow deposits begins almost immediately after emplacement, and continues thereafter for months or years. This study analyzes the extent, volume, thickness, and variability in pyroclastic flow deposits (PFDs) on Augustine ...
David B. McAlpin, Franz J. Meyer, Wenyu Gong, James E. Beget, Peter W. Webley   +4 more
doaj   +1 more source

Paleomagnetic study of the 30 ka Aira caldera-forming eruption and 60–45 ka Iwato pyroclastic flow deposits, southern Kyushu, Japan

Earth, Planets and Space
To constrain the age and duration of large-scale caldera-forming eruptions, we measured paleomagnetic directions of pyroclastic deposits from the 30 ka Aira caldera eruption sequence, and the 60–45 ka Iwato pyroclastic flow deposits around Aira caldera ...
Takeshi Hasegawa, Nobutatsu Mochizuki, Hidetoshi Shibuya, Ayumu Nishihara, Chie Kusu, Shohei Shibata, Makoto Okada, Kuniaki Nishiki, Yuki Sato   +8 more
doaj   +1 more source

Peculiar mode of occurrence of the Horekizon Formation and the Ata Pyroclastic Flow Deposit distributed in Ikeda-Horekizon, Ibusuki City, South Kyushu, Japan [PDF]

, 2012
Lacustrine sediment, unconformably overlies the late Pleistocene Kariya Lava and overlain by the Ata Pyroclastic Flow Deposit is exposed in the wall area of Ata Caldera so called, Ibusuki City. It was named the Horekizon Formation by authors.
YAMASHITA, Daisuke, 山下, 大輔, 大木, 公彦, OKI, Kimihiko   +3 more
core   +1 more source