Results 21 to 30 of about 9,073 (173)
Reliability of Total Grain-Size Distribution of Tephra Deposits
Scientific Reports, 2019 Total Grain-Size Distribution (TGSD) of tephra deposits is key to the characterization of explosive volcanism, plume-dispersal modeling, and magmatic fragmentation studies. Nonetheless, various aspects that includes deposit exposure and data fitting make
L. Pioli, C. Bonadonna, M. Pistolesi
semanticscholar +1 more source
Distance-learning For Approximate Bayesian Computation To Model a Volcanic Eruption [PDF]
Sankhya B (2020), 2019 Approximate Bayesian computation (ABC) provides us with a way to infer parameters of models, for which the likelihood function is not available, from an observation. Using ABC, which depends on many simulations from the considered model, we develop an inferential framework to learn parameters of a stochastic numerical simulator of volcanic eruption ...
arxiv +1 more source
Tephra occurrence in Alaska: a map-based compilation of stratigraphic tephra data [PDF]
, 2018 The principal hazard associated with future explosive eruptions of Alaska volcanoes is the generation of volcanic ash clouds which are explosively blasted high into the atmosphere and then drift away from the volcano with the wind. The fragments in the ash cloud (tephra) vary in size and the heavier particles fall near the source while finer particles ...
A.K. Worden +2 more
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Journal of Applied Volcanology, 2019 This paper describes the step-by-step process of characterizing tephra-fall deposits based on isopach, isomass and isopleth maps as well as thickness transects at different distances from their source. It covers the most frequently used empirical methods
S. Biass, C. Bonadonna, B. Houghton
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Identité granulométrique de Tephra
Bulletin de l'Association française pour l'étude du quaternaire, 1984 L'étude granulométrique (médiane et classement) de la fraction cendreuse (inférieure à 2 mm) des tephra volcaniques (émis par la Montagne Pelée et d'autres volcans andésitiques) permet de distinguer leurs différents dynamismes générateurs. Ainsi quatre grands types peuvent être séparés : • Les retombées ponceuses donnent des dépôts grossiers et ...
Bardintzeff, Jacques-Marie +1 more
openaire +3 more sources
Solving petrological problems through machine learning: the study case of tectonic discrimination using geochemical and isotopic data [PDF]
Contributions to Mineralogy and Petrology - Volume 171, Issue 10,
1 October 2016, Article number 81, 2017 Machine learning methods are evaluated to study the intriguing and debated topic of discrimination among different tectonic environments using geochemical and isotopic data. Volcanic rocks characterized by a whole geochemical signature of major elements (SiO2, TiO2, Al2O3, Fe2O3T, CaO, MgO, Na2O, K2O), selected trace elements (Sr, Ba, Rb, Zr, Nb, La ...
arxiv +1 more source
Stratigraphic and sedimentologic framework for tephras in the Wilson Creek Formation, Mono Basin, California, USA [PDF]
, 2018 Numerous tephra layers occur within the late Pleistocene Wilson Creek Formation, where they are interbedded with lacustrine deposits of Lake Russell, the ancestor of present-day Mono Lake. Most of the tephra layers are rhyolitic in composition, and were produced from the Mono Craters.
arxiv +1 more source
Evidence for geologically recent explosive volcanism in Elysium Planitia, Mars [PDF]
, 2020 Volcanic activity on Mars peaked during the Noachian and Hesperian periods but has continued since then in isolated locales. Elysium Planitia hosts numerous young, fissure-fed flood lavas with ages ranging from approximately 500 to 2.5 million years (Ma).
arxiv +1 more source
The interpretative value of transformed tephra sequences
Journal of Quaternary Science, 2019 We explore developments in tephra science that consider more than chronology, using case studies of morphological transformations of tephra deposits.
A. Dugmore +5 more
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Journal of Quaternary Science, 2019 The Eifel Laminated Sediment Archive (ELSA), which comprises several cores from maar lakes, includes numerous tephra layers spanning the last 140 000 years.
M. Förster +4 more
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