3D Shear Velocity Structure of the Caribbean—Northwestern South America Subduction Zone From Ambient Noise and Ballistic Rayleigh Wave Tomography

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dc.citation.articleNumbere2024GC011612en_US
dc.citation.issueNumber9en_US
dc.citation.journalTitleGeochemistry, Geophysics, Geosystemsen_US
dc.citation.volumeNumber25en_US
dc.contributor.authorMiao, Wenpeien_US
dc.contributor.authorCornthwaite, Johnen_US
dc.contributor.authorLevander, Alanen_US
dc.contributor.authorNiu, Fenglinen_US
dc.contributor.authorSchmitz, Michaelen_US
dc.contributor.authorLi, Guoliangen_US
dc.contributor.authorDionicio, Vivianaen_US
dc.contributor.authorPrieto, Germanen_US
dc.date.accessioned2024-10-01T14:03:57Zen_US
dc.date.available2024-10-01T14:03:57Zen_US
dc.date.issued2024en_US
dc.description.abstractThe Caribbean-South America subduction zone is a flat subduction zone, with Laramide-style thick-skinned uplifts occurring in the Merida Andes, Sierra de Perija Range, and Santa Marta Massif. Geodetic measurements and historical seismicity show this region is storing strain energy and is capable of a mega-thrust earthquake (M ≥ 8.0). Previous seismic investigations of the lithosphere and upper mantle in this area are either very large scale, very local, or only peripheral to this area; therefore, details of the Caribbean plate subduction geometry beneath the Maracaibo block remain unclear. In this study, we used a new data set acquired by the Caribbean-Merida Andes seismic experiment (CARMA), which comprised 65 temporary broadband stations and 44 permanent stations from the Colombian and Venezuelan national seismic networks. We jointly inverted ambient noise Rayleigh wave Z/H ratios, phase velocities in the 8–30 s band and ballistic Rayleigh wave phase velocities in 30–80 s band to construct a 3-D S-wave velocity model in the area between 75°–65°W and 5°–12°N. The 3-D model reveals a general increase in crust thickness from the trench to the southeast. An anomalous area is the Lake Maracaibo, which is underlaid by the thinnest crystalline crust in the region. This observation may indicate that the Maracaibo block is experiencing a contortion deformation within the crust. We also identified a high velocity anomaly above the subducting Caribbean slab, likely representing a detached piece of eclogitized Caribbean large igneous province from the base of the Maracaibo block. Additionally, our Vs model clearly indicates a slab tear within the subducted Caribbean slab, approximately beneath the Oca-Ancon Fault.en_US
dc.identifier.citationMiao, W., Cornthwaite, J., Levander, A., Niu, F., Schmitz, M., Li, G., Dionicio, V., & Prieto, G. (2024). 3D Shear Velocity Structure of the Caribbean—Northwestern South America Subduction Zone From Ambient Noise and Ballistic Rayleigh Wave Tomography. Geochemistry, Geophysics, Geosystems, 25(9), e2024GC011612. https://doi.org/10.1029/2024GC011612en_US
dc.identifier.digital3D-Shear-Velocity-Structureen_US
dc.identifier.doihttps://doi.org/10.1029/2024GC011612en_US
dc.identifier.urihttps://hdl.handle.net/1911/117893en_US
dc.language.isoengen_US
dc.publisherWileyen_US
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives (CC BY-NC-ND) license.  Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en_US
dc.title3D Shear Velocity Structure of the Caribbean—Northwestern South America Subduction Zone From Ambient Noise and Ballistic Rayleigh Wave Tomographyen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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