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Title

A 3-D shear velocity model of the southern North American and Caribbean plates from ambient noise and earthquake tomography

AuthorsGaite, Beatriz ; Villaseñor, Antonio ; Iglesias, Arturo; Herraiz Sarachaga, Miguel ; Jimenez-Munt, Ivone
Issue Date20-Feb-2015
PublisherCopernicus Publications
CitationSolid Earth, 6: 271- 284 (2015)
Abstract© 2015 Solid Earth. We use group velocities from earthquake tomography together with group and phase velocities from ambient noise tomography (ANT) of Rayleigh waves to invert for the 3-D shear-wave velocity structure (5-70 km) of the Caribbean (CAR) and southern North American (NAM) plates. The lithospheric model proposed offers a complete image of the crust and uppermost-mantle with imprints of the tectonic evolution. One of the most striking features inferred is the main role of the Ouachita-Marathon-Sonora orogeny front on the crustal seismic structure of the NAM plate. A new imaged feature is the low crustal velocities along the USA-Mexico border. The model also shows a break of the east-west mantle velocity dichotomy of the NAM and CAR plates beneath the Isthmus of the Tehuantepec and the Yucatan Block. High upper-mantle velocities along the Mesoamerican Subduction Zone coincide with inactive volcanic areas while the lowest velocities correspond to active volcanic arcs and thin lithospheric mantle regions.
URIhttp://hdl.handle.net/10261/112696
DOI10.5194/se-6-271-2015
Identifiersdoi: 10.5194/se-6-271-2015
issn: 1869-9529
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