Title

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

Author

BEATRIZ GAITE

Access level

Embargoed Access

Summary or description

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.

Publisher

Copernicus GmbH

Publish date

December 29, 2015

Publication type

Article

Publication version

Published Version

Information Resource

Format

pdf

Source

https://www.solid-earth.net/6/271/2015/

Language

English

Relation

Solid Earth

Gaite, B.; A. Villasenor; A. Iglesias; M. Herraiz and I. Jimenez-Munt. 2015. "A 3-D Shear Velocity Model of the Southern North American and Caribbean Plates from Ambient Noise and Earthquake Tomography." Solid Earth, 6(1), 271-284.

Source repository

Repositorio de Literatura del Servicio Sismológico Nacional

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