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| Titel |
A 3-D shear velocity model of the southern North American and Caribbean plates from ambient noise and earthquake tomography |
| VerfasserIn |
B. Gaite, A. Villaseñor, A. Iglesias, M. Herraiz, I. Jiménez-Munt |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 6, no. 1 ; Nr. 6, no. 1 (2015-02-20), S.271-284 |
| Datensatznummer |
250115402
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| Publikation (Nr.) |
 copernicus.org/se-6-271-2015.pdf |
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| Zusammenfassung |
| 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. |
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