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Evidence of earthquake seasonality in the Azores Triple Junction

dc.contributor.authorLordi, Ana L.
dc.contributor.authorNeves, MC
dc.contributor.authorCustódio, Susana
dc.contributor.authorDumont, Stéphanie
dc.date.accessioned2023-03-28T11:54:54Z
dc.date.available2023-03-28T11:54:54Z
dc.date.issued2023
dc.description.abstractThis work presents evidence of seasonal and inter-annual variations of the earthquake occurrence rate in the Azores Triple Junction, on the Mid-Atlantic Ridge (MAR). Annual cycles in microearthquakes are relatively common in intraplate continental regions afected by large hydrological loads, but this is the frst time that earthquake seasonality is recognized near mid-ocean ridges. First, we benchmark the methodology by matching the published results of earthquake seasonality in the intraplate New Madrid Seismic Zone (USA). Next, we analyze the Azores earthquake catalogue, from 2008 to 2018, separately for oceanic and island regions. The results demonstrate that the seasonal modulation of the seismicity rate is only observed in the ocean, especially in the vicinity of the triple junction, with more earthquakes occurring during the summer months from May to August. Monte Carlo simulations show that the probability of observing such seasonality by chance is less than 1% for the magnitude band from 3.3 to 4.5, well above the detection threshold and magnitude of completeness of the seismic catalogue. The methodology includes a Jack-Knife approach, which shows that the oceanic seasonality is not the consequence of abnormal or extreme events. Although we speculate about possible earthquake triggering processes, it remains a challenge to defnitely establish the mechanism responsible for the observed earthquake seasonal modulation in the Azores.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1007/s00367-023-00744-3pt_PT
dc.identifier.issn0276-0460
dc.identifier.urihttp://hdl.handle.net/10400.1/19332
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringerpt_PT
dc.relationInstituto Dom Luiz
dc.relationIntegRatEd tools to decipher the genesis and Spatio-TemporaL Evolution of Seismic Sequences.
dc.relationMagma transfer to the surface at intraplate stratovolcanoes: From a geophysical characterization to a monitoring perspective
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectSeismicitypt_PT
dc.subjectPlateaupt_PT
dc.titleEvidence of earthquake seasonality in the Azores Triple Junctionpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleInstituto Dom Luiz
oaire.awardTitleIntegRatEd tools to decipher the genesis and Spatio-TemporaL Evolution of Seismic Sequences.
oaire.awardTitleMagma transfer to the surface at intraplate stratovolcanoes: From a geophysical characterization to a monitoring perspective
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50019%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FCTA-GEF%2F6674%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBPD%2F117714%2F2016/PT
oaire.citation.issue1pt_PT
oaire.citation.titleGeo-Marine Letterspt_PT
oaire.citation.volume43pt_PT
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream3599-PPCDT
person.familyNameLordi Dias
person.familyNameNeves
person.givenNameAna Laura
person.givenNameMaria
person.identifier.ciencia-id5E14-4CFF-CBA7
person.identifier.ciencia-idF016-4214-4A45
person.identifier.orcid0000-0002-8514-346X
person.identifier.orcid0000-0001-5726-3467
person.identifier.ridA-7703-2013
person.identifier.scopus-author-id7103415176
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublication5aa08a50-0e64-4d5d-acd6-d817b92e74c5
relation.isAuthorOfPublication.latestForDiscovery0273cd97-aa05-4dce-9c66-825eae8ce879
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