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

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Gaite, B. and Villaseñor, A. and Iglesias, A. and Herraiz Sarachaga, Miguel and Jiménez Munt, I. (2015) A 3-D shear velocity model of the southern North American and Caribbean plates from ambient noise and earthquake tomography. Solid earth, 6 . pp. 271-284. ISSN 1869-9510

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Official URL: http://www.solid-earth.net/6/271/2015/




Abstract

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.


Item Type:Article
Additional Information:

© Author(s) 2015. Seismic data come from the Mexican National Seismological Service (NSSM), and from the networks CI, CU, G, GE, II, IU, LI, NR, OV, TA and US through the IRIS Consortium. We acknowledge C. Valdés, A. Cárdenas, C. Cárdenas, I. Rodríguez, J. Pérez, J. Estrada, and S. I. Franco for providing NSSM data. The maps and graphs were drawn with the Generic Mapping Tools (Wessel and Smith, 1998). Funds provided by the REPSOL CO-DOS project supported B. Gaite. This is a contribution of the Team Consolider-Ingenio 2010 TOPO-IBERIA (CSD2006-00041). We thank D. García and A. Ugalde for their useful comments for improving this manuscript. We also are grateful to Taka’aki Taira and two anonymous reviewers for their constructive and helpful suggestions for enhancing the paper.

Uncontrolled Keywords:Gulf-of-california; Surface-wave tomography; Upper-mantle; Seismic noise; Transition zone; Diffractiontomography; Crustal corrections; Surrounding oceans; Tectonic evolution; Receiver functions
Subjects:Sciences > Physics > Geophysics
Sciences > Physics > Meteorology
ID Code:30173
Deposited On:20 May 2015 14:23
Last Modified:20 May 2015 14:23

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