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Characterization of microseismic noise in Cape Verde

2019-06Journal article Restricted access
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dc.contributor.authorCarvalho, Joana
dc.contributor.authorSilveira, Graça
dc.contributor.authorSchimmel, Martin
dc.contributor.authorStutzmann, Eleonore
dc.date.accessioned2019-07-26T10:38:18Z
dc.date.available2019-07-26T10:38:18Z
dc.date.issued2019-06
dc.description.abstractThe interaction of ocean waves with either the seafloor or other ocean waves generates primary (PM) and secondary microseisms (SM) that propagate through the crust and mantle, predominantly as Rayleigh waves. The horseshoe geometry and surrounding bathymetry of the Cape Verde archipelago play a significant role in the ambient-noise generation in this region. We analyze the microseisms recorded in the region using two different temporary seismic networks, and we determine the number of signals polarized as Rayleigh waves and their back azimuth (BAZ) as a function of time and frequency. The relative number of polarized signals between PM and SM varies between the stations. At most of the stations, the SM can be divided into two frequency bands. At lower frequencies (0.1-0.2 Hz), the number of SM signals is stable throughout the year, whereas at higher frequencies (0.2-0.3 Hz) this number varies with the season, with more polarized signals during the northern hemisphere spring and summer. In both frequency ranges and at most stations, the BAZ does not vary significantly over the year and points toward sources within the archipelago and outside. We compute the source site effect and show that the local bathymetry around the Cape Verde Islands strongly amplifies local SM sources. Finally, we compare the measured BAZ with source areas derived from an ocean-wave model, which confirms that Cape Verde stations mostly record local sources.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCARVALHO, Joana F.; [et al] – Characterization of microseismic noise in Cape Verde. Bulletin of the Seismological Society of America. ISSN 0037-1106. Vol. 109, N.º 3 (2019), pp. 1099-1109pt_PT
dc.identifier.doi10.1785/0120180291pt_PT
dc.identifier.issn0037-1106
dc.identifier.issn1943-3573
dc.identifier.urihttp://hdl.handle.net/10400.21/10376
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSeismological Society of Americapt_PT
dc.relationUTAP-EXPL/EAC/0056/2017 - Project Atmosphere-Ocean-Solid Earth Coupling: Seismic Tools to Explore and Monitor the Oceans (STORM)pt_PT
dc.relation4318/40851YL - Project Transnational cooperation-Pessoa Program (PHC-PESSOA)pt_PT
dc.relationPTDC/GEO-GEO/1123/2014 - Project Fogo Island volcano: multi disciplinary Research on 2014 Eruption (FIRE)pt_PT
dc.relationPD/BD/114480/2016 - FCTpt_PT
dc.relationUID/GEO/50019/2019 - FCTpt_PT
dc.relationES1401 - European COST action TIDESpt_PT
dc.subjectMicroseismic noisept_PT
dc.subjectPrimary microseisms (PM)pt_PT
dc.subjectSecondary microseisms (SM)pt_PT
dc.subjectCape Verdept_PT
dc.titleCharacterization of microseismic noise in Cape Verdept_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FCTE-GIN%2F64330%2F2006/PT
oaire.citation.endPage1109pt_PT
oaire.citation.issue3pt_PT
oaire.citation.startPage1099pt_PT
oaire.citation.titleBulletin of the Seismological Society of Americapt_PT
oaire.citation.volume109pt_PT
oaire.fundingStream3599-PPCDT
person.familyNameSantos de Carvalho
person.familyNameSilveira
person.familyNameSchimmel
person.familyNameStutzmann
person.givenNameJoana Filipa
person.givenNameGraça
person.givenNameMartin
person.givenNameEleonore
person.identifier91922
person.identifier870885
person.identifier.ciencia-id2E17-6C99-4CBB
person.identifier.ciencia-id1116-1080-16F3
person.identifier.ciencia-id3214-52D1-5021
person.identifier.orcid0000-0003-1077-8994
person.identifier.orcid0000-0002-2110-2554
person.identifier.orcid0000-0003-2601-4462
person.identifier.orcid0000-0002-4348-7475
person.identifier.ridA-3081-2009
person.identifier.ridC-2261-2008
person.identifier.ridG-8511-2014
person.identifier.scopus-author-id6602698071
person.identifier.scopus-author-id7005628038
person.identifier.scopus-author-id6603444257
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
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