Intermediate-depth earthquakes in southern Spain and Alboran Sea

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dc.contributor.authorLópez Sánchez, Carolina
dc.contributor.authorBuforn Peiró, Elisa
dc.contributor.authorCesca, Simone
dc.contributor.authorLozano, Lucía
dc.contributor.authorSanz de Galdeano, Carlos
dc.contributor.authorMattesini, Maurizio
dc.contributor.authorUdías Vallina, Agustín
dc.contributor.authorCantavella, Juan Vicente
dc.date.accessioned2023-06-22T10:43:53Z
dc.date.available2023-06-22T10:43:53Z
dc.date.issued2022-02-20
dc.descriptionCRUE-CSIC (Acuerdos Transformativos 2022) © 2022 The Authors. This work has been partially supported by the Spanish Ministry of Economy and Competitiveness (CGL2017-86070-R). We want to thank the Instituto Geografico Nacional (IGN, doi: https://doi.org/10.7 914/sn/es) for providing part of the data. C. L-S also wants to thank the Erasmus+ Program of the Universidad Complutense de Madrid for supporting the internship at the German Research Centre for Geosciences (GFZ) and to the GFZ itself. The authors wish to thank the anonymous reviewer, the reviewer Dr. Maria Mesimeri and the editor Dr. Ramon Carbonell for their valuable comments and suggestions, which allowed us to improve our manuscript.
dc.description.abstractA striking feature of the seismicity in the Ibero-Maghrebian region is a narrow band of intermediate-depth earthquakes (50 < h < 100 km) beneath the western part of the Alboran Sea, with epicenters following a NNE-SSW alignment. The origin and characteristics of this seismicity are debated, and an accurate analysis of this seismic scenario is provided despite the low to moderate magnitude of these earthquakes. In this study, we collect 20 years of seismic data from permanent and temporary installations and reprocess these data with the aid of advanced seismological techniques, including non-linear probabilistic relocation with a 3D-Earth velocity model and a probabilistic moment tensor inversion scheme, to shed new light on intermediate-depth seismicity in Southern Spain and the Alboran Sea. We relocated 238 intermediate-depth earthquakes (M >= 3) using a nonlinear probabilistic approach and a recent regional 3D tomography lithospheric velocity model for the Alboran-Betic Rif Zone. Maximum likelihood hypocenters confirm the NNE-SSW distribution in a depth range between 50 and 100 km, depicting three clusters of epicenters with a seismic gap that may be correlate to the boundary between the sunken slabs of the Iberian and African plates around Gibraltar. We simultaneously determined the focal mechanisms of 25 mb > 3.9 earthquakes using P-waves and moment tensors by fitting body-wave amplitude spectra and waveform cross-correlations. We performed an accurate resolution study by repeating the inversion using different 1-D velocity models. The results show predominant horizontal T axes with a rotation on the direction from NE-SW in southern Spain to E-W near the African coast. The distribution of intermediate-depth earthquakes and their source geometries provide new evidence of the seismotectonic complexity of the region, which is possibly controlled by the stopping or slowing down of subduction.
dc.description.departmentDepto. de Física de la Tierra y Astrofísica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Economía y Competitividad (MINECO)
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/72527
dc.identifier.doi10.1016/j.tecto.2022.229238
dc.identifier.issn0040-1951
dc.identifier.officialurlhttp://dx.doi.org/10.1016/j.tecto.2022.229238
dc.identifier.relatedurlhttps://www.elsevier.com/
dc.identifier.urihttps://hdl.handle.net/20.500.14352/71531
dc.journal.titleTectonophysics
dc.language.isoeng
dc.publisherElsevier
dc.relation.projectIDCGL2017-86070-R
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España
dc.rights.accessRightsopen access
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject.cdu550.3
dc.subject.keywordHypocentral relocations
dc.subject.keyword3D-earth model
dc.subject.keywordNon-linear location
dc.subject.keywordSeismic moment tensor inversion
dc.subject.keywordAlboran Sea
dc.subject.keywordSouthern SpainDeep-Focus Earthquake
dc.subject.keywordUpper-Mantle Beneath
dc.subject.keywordFocal Mechanisms
dc.subject.keywordMoment Tensor
dc.subject.keywordGeodynamic Evolution
dc.subject.keywordSubduction Beneath
dc.subject.keywordPlate Boundary
dc.subject.keywordTravel-Times
dc.subject.keywordMarch 29
dc.subject.keywordLithosphere
dc.subject.ucmGeofísica
dc.subject.unesco2507 Geofísica
dc.titleIntermediate-depth earthquakes in southern Spain and Alboran Sea
dc.typejournal article
dc.volume.number825
dspace.entity.typePublication
relation.isAuthorOfPublication5803f785-323c-4a04-b9c7-aaf30c616f58
relation.isAuthorOfPublication5f3e9855-880f-4f3a-b025-19f0e3db2257
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relation.isAuthorOfPublication.latestForDiscovery5803f785-323c-4a04-b9c7-aaf30c616f58
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