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resumen

Resumen
Although volcanic eruptions represent short periods in the whole history of a volcano, the large amount of loose pyroclastic material produced, combined with aeolian processes, can lead to continuous, long-lasting reworking of volcanic products. Driven by wind, these processes significantly influence the geomorphology and prolong the impacts of eruptions on exposed communities and ecosystems. Since such phenomena are of interest to scientists from a [ver mas...]
dc.contributor.authorDominguez, Lucia
dc.contributor.authorBonadonna, Costanza
dc.contributor.authorForte, Pablo
dc.contributor.authorJarvis, Paul Antony
dc.contributor.authorCioni, Raffaello
dc.contributor.authorMingari, Leonardo
dc.contributor.authorBran, Donaldo Eduardo
dc.contributor.authorPanebianco, Juan Esteban
dc.date.accessioned2020-01-15T11:55:36Z
dc.date.available2020-01-15T11:55:36Z
dc.date.issued2020-01-14
dc.identifier.issn2296-6463 (Online)
dc.identifier.urihttp://hdl.handle.net/20.500.12123/6679
dc.description.abstractAlthough volcanic eruptions represent short periods in the whole history of a volcano, the large amount of loose pyroclastic material produced, combined with aeolian processes, can lead to continuous, long-lasting reworking of volcanic products. Driven by wind, these processes significantly influence the geomorphology and prolong the impacts of eruptions on exposed communities and ecosystems. Since such phenomena are of interest to scientists from a range of disciplines (e.g., volcanology, atmospheric and soil sciences), a well-defined, common nomenclature is necessary to optimise the multidisciplinary characterisation of both processes and deposits. We, therefore, first describe ash wind-remobilisation processes and provide definitions for appropriate terms consistent with the World Meteorological Organisation’s (WMO’s) classification of lithometeors. Second, we apply these definitions to investigate aeolian remobilisation of the 2011 Cordón Caulle (Chile) tephra-fallout deposit, which has strongly impacted rural communities in the Argentinian Patagonia steppe. We combine field observations and a physical characterisation of systematically collected ground and airborne material in order to identify the secondary deposits associated with: (i) non-erodible surface roughness elements (e.g., vegetation and rocks) and (ii) pre-existing mounds or similar erodible bedforms. Grainsize analysis shows that wind-remobilised particles have a specific size range, from <0.4 to 500 mm, with a 95% of the material between 1 and 255 mm, median values of 25–135 mm and modes of 30–95 mm. We find that 15– 40% of the remobilised material ranges from 63–125 mm, coinciding with the size range which minimises the wind threshold friction velocity. Interestingly, particle shape analysis shows that for this size fraction, remobilised particles display the largest differences in shape descriptors (convexity, solidity and circularity) with respect to the primary ash, indicating abrasion and rounding due to saltation. Although particle (size and shape) and deposit features (morphology and structures) alone are insufficient to interpret transport mechanisms, their combination suggests that whilst saltation is the most common particle transport mechanism, suspension and creep also play an important role. As well as inferring transport mechanisms from this combined approach, we also demonstrate how the correlation of the primary volcanic source with the associated remobilised deposits is fundamental to our understanding of the life cycle of volcanic ash.eng
dc.formatapplication/pdfeng
dc.language.isoeng
dc.publisherFrontiers Media SAes_AR
dc.rightsinfo:eu-repo/semantics/openAccesseng
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/
dc.sourceFrontier in earth science 7 : 343. (January 2020)es_AR
dc.subjectSismologíaes_AR
dc.subjectSeismologyeng
dc.subjectErupciones Volcánicases_AR
dc.subjectVolcanic Eruptionseng
dc.subjectCenizaes_AR
dc.subjectAsheseng
dc.subjectErosión Eólicaes_AR
dc.subjectWind Erosioneng
dc.subject.otherVulcanologíaes_AR
dc.subject.otherRemobilisationeng
dc.subject.otherRegión Patagónicaes_AR
dc.subject.otherCordón Caullees_AR
dc.titleAeolian Remobilisation of the 2011-Cordón Caulle Tephra-Fallout Deposit: Example of an Important Process in the Life Cycle of Volcanic Asheng
dc.typeinfo:ar-repo/semantics/artículoes_AR
dc.typeinfo:eu-repo/semantics/articleeng
dc.typeinfo:eu-repo/semantics/publishedVersioneng
dc.rights.licenseCreative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.description.origenEstación Experimental Agropecuaria Barilochees_AR
dc.description.filFil: Dominguez, Lucia. University of Geneva. Department of Earth Sciences; Suizaes_AR
dc.description.filFil: Bonadonna, Costanza. University of Geneva. Department of Earth Sciences; Suizaes_AR
dc.description.filFil: Forte, Pablo. Universidad Nacional de Buenos Aires. Departamento de Ciencias Geologicas; Argentinaes_AR
dc.description.filFil: Jarvis, Paul Antony. University of Geneva. Department of Earth Sciences; Suizaes_AR
dc.description.filFil: Cioni, Raffaello. University of Florence. School of Mathematical, Physical and Natural Sciences. Department of Earth Sciences; Italyes_AR
dc.description.filFil: Mingari, Leonardo. Barcelona Supercomputing Center; Spaines_AR
dc.description.filFil: Bran, Donaldo Eduardo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentinaes_AR
dc.description.filFil: Panebianco, Juan Esteban. Universidad Nacional de La Pampa. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Consejo Nacional de Investigaciones Cietíficas y Técnicas; Argentinaes_AR
dc.subtypecientifico


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