One decade of b-value variations from volcano-tectonic seismicity as an early indicator of episodes of crisis in a volcano: the case of Copahue, Southern Andes

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datacite.alternateIdentifier.citationFrontiers in Earth Science, 11, 2023
datacite.alternateIdentifier.doi10.3389/feart.2023.1181177
datacite.alternateIdentifier.issn2296-6463
datacite.creatorFarías, Cristian
datacite.creatorLazo, Jonathan
datacite.creatorBasualto, Daniel
datacite.creatorSaavedra, Marcela
datacite.creatorMuñoz-Quiroz, Felipe
datacite.creatorZúñiga-Urrea, Lucas
datacite.creatorMartínez-Bravo, Rodrigo
datacite.creatorHuentenao-Inostroza, Ian
datacite.creatorSáez-Opazo, Ramón
datacite.date2023
datacite.rightsAcceso abierto
datacite.subjectB-value
datacite.subjectCopahue Volcano
datacite.subjectEarthquake-volcano Interaction
datacite.subjectUnrest Phases
datacite.subjectVolcano-tectonic Events
datacite.subjectMagma
datacite.subjectSeismicity
datacite.subjectTectonics
datacite.subjectVolcanic Earthquake
datacite.subjectVolcanic Eruption
datacite.subjectVolcano
datacite.subjectAndes
datacite.subjectChile
datacite.subjectCopahue
datacite.subjectNeuquen
datacite.subjectSouthern Volcanic Zone
datacite.titleOne decade of b-value variations from volcano-tectonic seismicity as an early indicator of episodes of crisis in a volcano: the case of Copahue, Southern Andes
dc.contributor.authorFARIAS VEGA, CRISTIAN ALEX
dc.description.abstractVolcanoes can enter in episodes of unrest, which might end later in an eruption, with little warning. They are normally produced due to the inner dynamics of the volcano, but can also be triggered by external earthquakes. To detect these periods early, it becomes crucial to understand the dynamics of the different structures (such as fault systems) of the volcano, as they can act as magma pathways and can also generate instabilities on it. In this article we study the seismicity of Copahue (central-south Chile), which sits atop a complex system of faults, and was importantly affected by the 2010 Mw 8.8 Maule earthquake. We focused ourselves in the temporal variations of the b-value of the Gutenberg-Richter law during the 2012 2022 period. During this timeframe the volcano had a series of crises, which led to seven eruptive phases. Our results show that the system does exhibit signs of a future unrest phase weeks to months before there is a change on its alert level, and they are mostly linked to the activity of a N-S fault zone, located not beneath the main crater of Copahue, but around 10 km to the East. Most of the crises start after drops in the b-value of this structure, with sudden variations in b-value being also noticeable as a response to the 2015 Mw 8.3 Illapel earthquake. Our results show a correlation between instances of fluid injection and release in the relevant structures of an active volcano with the variations of the b-value. This allow us to use the temporal variations of the b-value as a tool to anticipate the inner dynamics of the system, particularly when there is a strong structural control on it, such as in the case of Copahue. We also found out that the influence of the 2010 Mw 8.8 Maule earthquake was long-lived, affecting mostly the structures that later destabilized the volcano for the most part of a decade, therefore enhancing magma injection into the whole system. This seems to have changed since 2021, which might indicate a waning in the influence of the megathrust earthquake in Copahue volcano. © 2025 Elsevier B.V., All rights reserved.
dc.description.ia_keywordvolcano, value, copahue, variations, also, system, earthquake
dc.formatPDF
dc.identifier.urihttps://repositoriodigital.uct.cl/handle/10925/5636
dc.language.isoen
dc.publisherFrontiers Media
dc.relationinstname: ANID
dc.relationreponame: Repositorio Digital RI2.0
dc.rights.driverinfo:eu-repo/semantics/openAccess
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/cl/
dc.sourceFrontiers in Earth Science
dc.subject.ia_oecd1nIngeniería y Tecnología
dc.subject.ia_oecd2nIngeniería Mecánica
dc.subject.ia_oecd3nIngeniería Mecánica
dc.type.driverinfo:eu-repo/semantics/article
dc.type.driverhttp://purl.org/coar/resource_type/c_2df8fbb1
dc.type.openaireinfo:eu-repo/semantics/publishedVersion
dspace.entity.typePublication
oaire.citationEdition2023
oaire.citationTitleFrontiers in Earth Science
oaire.citationVolume11
oaire.fundingReferenceANID FONDECYT INICIACIÓN 11230715
oaire.fundingReferenceU.S. Army Research Office W911NF2010258
oaire.fundingReferenceANID FONDEF 19I10397
oaire.fundingReferenceADAIN Ministerio de Educación CIVUR-39 FR02193
oaire.licenseConditionObra bajo licencia Creative Commons Atribución 4.0 Internacional
oaire.licenseCondition.urihttps://creativecommons.org/licenses/by/4.0/
oaire.resourceTypeArtículo
oaire.resourceType.enArticle
relation.isAuthorOfPublication5f4b56d8-91cd-46a3-bc83-c2fda5280b97
relation.isAuthorOfPublication.latestForDiscovery5f4b56d8-91cd-46a3-bc83-c2fda5280b97
uct.catalogadorjvu
uct.comunidadIngenieríaen_US
uct.departamentoDepartamento de Obras Civiles y Geología
uct.facultadFacultad de Ingeniería
uct.indizacionScience Citation Index Expanded - SCIE
uct.indizacionScopus
uct.indizacionDOAJ
uct.indizacionAstrophysics Data System (SAO/NASA ADS)
uct.indizacionEmerging Sources Citation Index - ESCI
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