Results 11 to 20 of about 9,073 (173)
Preservation of thin tephra [PDF]
Journal of Applied Volcanology, 2017 The preservation of thin (
R. Blong, N. Enright, P. Grasso
semanticscholar +4 more sources
Direct and indirect luminescence dating of tephra: A review [PDF]
Journal of Quaternary Science, 2019 In Quaternary studies, tephras are widely used as marker horizons to correlate geological deposits. Therefore, accurate and precise dating is crucial.
J. Bösken, Christoph Schmidt
semanticscholar +5 more sources
Tephra transformations: variable preservation of tephra layers from two well-studied eruptions [PDF]
Bulletin of Volcanology, 2018 Volcanologists often use terrestrial tephra layers to reconstruct volcanic eruptions. However, the conversion of fresh tephra deposits into tephra layers is poorly understood. To address this knowledge gap, we surveyed tephra layers emplaced by the 1980 eruption of Mount St Helens, USA (MSH1980) and the 1947 eruption of Hekla, Iceland (H1947).
N. Cutler +7 more
semanticscholar +6 more sources
Tephra isochrons and chronologies of colonisation [PDF]
Quaternary Geochronology, 2017 Abstract This paper demonstrates the use of tephrochronology in dating the earliest archaeological evidence for the settlement of Iceland. This island was one of the last places on Earth settled by people and there are conflicting ideas about the pace and scale of initial colonisation.
Magdalena M E Schmid +3 more
semanticscholar +5 more sources
, 2020 . Tephra layers produced by volcanic eruptions are widely used for correlation and dating of various deposits and landforms, for synchronization of disparate paleoenvironmental archives, and for reconstruction of magma origin.
M. Portnyagin +7 more
semanticscholar +1 more source
A theoretical model of Surtseyan bomb fragmentation [PDF]
, 2021 Surtseyan eruptions are an important class of mostly basaltic volcanic eruptions first identified in the 1960s, where erupting magma at an air-water interface interacts with large quantities of slurry, a mixture of previously ejected tephra that re-enters the crater together with water.
arxiv +1 more source
Rootless tephra stratigraphy and emplacement processes [PDF]
Bulletin of Volcanology, 2017 Volcanic rootless cones are the products of thermohydraulic explosions involving rapid heat transfer from active lava (fuel) to external sources of water (coolant). Rootless eruptions are attributed to molten fuel-coolant interactions (MFCIs), but previous studies have not performed systematic investigations of rootless tephrostratigraphy and grain ...
Thorvaldur Thordarson +3 more
openaire +2 more sources
Near-Real-Time Tephra Fallout Assessment at Mt. Etna, Italy
Remote Sensing, 2019 During explosive eruptions, emergency responders and government agencies need to make fast decisions that should be based on an accurate forecast of tephra dispersal and assessment of the expected impact. Here, we propose a new operational tephra fallout
S. Scollo +13 more
semanticscholar +1 more source
Correlation of Papanetu Tephra to Karapiti Tephra, central North Island, New Zealand [PDF]
New Zealand Journal of Geology and Geophysics, 1986 Abstract New road exposures around Lake Rotoaira and south and east of Lake Taupo have provided the opportunity to re-examine the stratigraphic relationships between the rhyolitic Papanetu and Karapiti Tephras (c. 10 000 years B.P.). Papanetu Tephra is everywhere typical of a distal rhyolitic tephra; it is thin (< 2 cm), fine grained, and forms ...
Graeme J. Solloway, Paul C. Froggatt
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Syneruptive sequential fragmentation of pyroclasts from fractal modeling of grain size distributions of fall deposits: The Cretaio Tephra eruption (Ischia Island, Italy) [PDF]
Paredes-Mari\~no, et al., 2017.
doi:10.1016/j.jvolgeores.2017.07.020, 2018 In this work we used fractal statistics in order to decipher the mechanisms acting during explosive volcanic eruptions by studying the grain size distribution (GSD) of natural pyroclastic-fall deposits. The method was applied to lithic-rich proximal deposits from a stratigraphic section of the Cretaio Tephra eruption (Ischia Island, Italy).
arxiv +1 more source