Crustal velocity structure of southern Guatemala using refracted and Sp converted waves

An overview of the crust and upper mantle structure of the Central America and Caribbean region is presented as a result of the processing of more than 200 seismograms recorded by digital broadband stations from SSSN and GSN seismic networks. By FTAN analysis of the fundamental mode of the Rayleigh waves, group velocity dispersion curves are obtained in the period range from 10 s to 40 s; the error of these measurements varies from 0.06 and 0.10 km/s. From the dispersion curves, seven tomographic maps at different periods and with average spatial resolution of 500 km are obtained. Using the logical combinatorial classification techniques, eight main groups of dispersion curves are determined from the tomographic maps and eleven main regions, each one characterized by one kind of dispersion curves, are identified. The average dispersion curves obtained for each region are extended to 150 s by adding data from the tomographic study of [3] and inverted using a non-linear procedure. As a result of the inversion process, a set of models of the Swave velocity vs. depth in the crust and upper mantle are found. In six regions, we identify a typically oceanic crust and upper mantle structure, while in the other two the models are consistent with the presence of a continental structure. Two regions, located over the major geological zones of the accretionary crust of the Caribbean region, are characterized by a peculiar crust and upper mantle structure, indicating the presence of lithospheric roots reaching, at least, about 200 km of depth.2

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Crust and Upper Mantle Structure in the Caribbean Region by Group Velocity Tomography and Regionalization

González

Álvarez

Guidarelli

et al. 2007

Pure appl. geophys.

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S-Wave Velocities of the Lithosphere–Asthenosphere System in the Caribbean Region

González

Álvarez

Moreno

et al. 2011

Pure Appl. Geophys.

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An overview of the S-wave velocity (Vs) structural model of the Caribbean with a resolution of 2° 9 2° is presented. New tomographic maps of Rayleigh wave group velocity disper- sion at periods ranging from 10 to 40 s were obtained as a result of the frequency time analysis of seismic signals of more than 400 ray-paths in the region. For each cell of 2° 9 2°, group velocity dispersion curves were determined and extended to 150 s by adding data from a larger scale tomographic study (VDOVIN et al., Geo- phys. J. Int 136:324–340, 1999). Using, as independent a priori information, the available geological and geophysical data of the region, each dispersion curve has been inverted by the ‘‘hedgehog’’ non-linear procedure (VALYUS, Determining seismic profiles from a set of observations (in Russian), Vychislitielnaya Seismologiya 4, 3–14. English translation: Computational Seismology (V.I. Keylis- Borok, ed.) 4:114–118, 1968), in order to compute a set of Vs versus depth models up to 300 km of depth. Because of the non- uniqueness of the solutions for each cell, a local smoothness optimization has been applied to the whole region in order to choose a three-dimensional model of Vs, satisfying this way the Occam’s razor concept. Several known and some new main fea- tures of the Caribbean lithosphere and asthenosphere are shown on these models such as: the west directed subduction zone of the eastern Caribbean region with a clear mantle wedge between the Caribbean lithosphere and the subducted slab; the complex and asymmetric behavior of the crustal and lithospheric thickness in the Cayman ridge; the predominant oceanic crust in the region; the presence of continental type crust in Central America, and the South and North America plates; as well as the fact that the bottom of the upper asthenosphere gets shallower going from west to east

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Along and across arc geochemical variations in NW Central America: Evidence for involvement of lithospheric pyroxenite

Heydolph¹,

Hoernle²,

Hauff³

et al. 2012

Geochimica et Cosmochimica Acta

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Crustal velocity structure of southern Guatemala using refracted and Sp converted waves

Cited by 7 publications

References 11 publications

Crust and Upper Mantle Structure in the Caribbean Region by Group Velocity Tomography and Regionalization

Crust and Upper Mantle Structure in the Caribbean Region by Group Velocity Tomography and Regionalization

S-Wave Velocities of the Lithosphere–Asthenosphere System in the Caribbean Region

Along and across arc geochemical variations in NW Central America: Evidence for involvement of lithospheric pyroxenite

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