Low-Energy Fragmentation Dynamics at Copahue Volcano (Argentina) as Revealed by an Infrasonic Array and Ash Characteristics

dc.creatorHantusch, Marcia
dc.creatorLacanna, Giorgio
dc.creatorRipepe, Maurizio
dc.creatorMontenegro, Verónica
dc.creatorValderrama, Oscar
dc.creatorFarias, Camila
dc.creatorCaselli, Alberto Tomás
dc.creatorGabellini, Pietro
dc.creatorCioni, Raffaello
dc.date2021
dc.date.accessioned2023-08-30T16:40:56Z
dc.date.available2023-08-30T16:40:56Z
dc.identifierHantusch M., Ripepe M., Lacanna G., Montenegro V., Valderrama O, Farias C., Caselli A., Gabellini P, Cioni R. (2021). Low-energy fragmentation dynamics and ash recycling during explosive activity at Copahue volcano (Argentina) as revealed by infrasonic array and ash characteristics. Frontiers Earth Science; 9; 578437.
dc.identifier2296-6463
dc.identifierhttps://www.frontiersin.org/articles/10.3389/feart.2021.578437/full
dc.identifierhttp://rid.unrn.edu.ar/handle/20.500.12049/7391
dc.identifierhttps://doi.org/10.3389/feart.2021.578437
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8535152
dc.descriptionFil: Hantusch, Marcia. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.
dc.descriptionFil: Lacanna, Giorgio. Dipartimento di Scienze della Terra, Università di Firenze. Florence, Italy.
dc.descriptionFil: Ripepe, Maurizio. Dipartimento di Scienze della Terra, Università di Firenze. Florence, Italy.
dc.descriptionFil: Montenegro, Veronica. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.
dc.descriptionFil: Valderrama, Oscar. Observatorio Volcanológico de Los Andes del Sur (OVDAS), Servicio Nacional de Geología y Minería. Temuco, Chile.
dc.descriptionFil: Farias, Camila. Servicio Meteorológico Nacional. Buenos Aires, Argentina.
dc.descriptionFil: Caselli, Alberto. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.
dc.descriptionFil: Gabellini, Pietro. Dipartimento di Scienze della Terra, Università di Firenze. Florence, Italy.
dc.descriptionFil: Cioni, Raffaello. Dipartimento di Scienze della Terra, Università di Firenze. Florence, Italy.
dc.descriptionAsh-rich eruptions represent a serious risk to the population living nearby as well as at thousands of kilometers from a volcano. Volcanic ash is the result of extensive magma fragmentation during an eruption, and it depends upon a combination of magma properties such as rheology, vesicularity and permeability, gas overpressure and the possible involvement of external fluids during magma ascent. The explosive process generates infrasonic waves which are directly linked to the outflow of the gas-particle mixture in the atmosphere. The higher the overpressure in the magma, the higher should be the exit velocity of the ejected material and the acoustic pressure related to this process. During violent eruptions, fragmentation becomes more efficient and is responsible for the extensive production of ash which is dispersed in the atmosphere. We show that the phase of intense ash emission that occurred during March 2016 at Copahue volcano (Argentina) generated a very low (0.1 Pa) infrasonic amplitude at 13 km, raising a number of questions concerning the links among acoustic pressure, gas overpressure and efficiency of magma fragmentation. Infrasound and direct observations of the eruptive plume indicate that the large quantity of ash erupted at Copahue was ejected with a low exit velocity. Thus, it was associated with eruptive dynamics driven by a low magma overpressure. This is more evident when infrasonic activity at Copahue is compared to the moderate explosive activity of Villarrica (Chile), recorded by the same array, at a distance of 193 km. Our data suggest a process of rigid fragmentation under a low magma overpressure which was nearly completely dissipated during the passage of the erupting mixture through the granular, ash-bearing crater infilling. We conclude that ash released into the atmosphere during low-energy fragmentation dynamics can be difficult to monitor, with direct consequences for the assessment of the related hazard and management of eruptive crises.
dc.descriptiontrue
dc.description-
dc.formatapplication/pdf
dc.languageen
dc.publisherMcGill University
dc.relationhttps://www.frontiersin.org/journals/earth-science#
dc.relation9
dc.relationFrontiers Earth Science
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/4.0/
dc.subjectCiencias Exactas y Naturales
dc.subjectFragmentation
dc.subjectInfrasound
dc.subjectAsh eruptions
dc.subjectVolcanic Hazard
dc.subjectMonitoring
dc.subjectCiencias Exactas y Naturales
dc.titleLow-Energy Fragmentation Dynamics at Copahue Volcano (Argentina) as Revealed by an Infrasonic Array and Ash Characteristics


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