S wave velocity structure below central Mexico using high-resolution surface wave tomography

Shear wave velocity of the crust below central Mexico is estimated using surface wave dispersion measurements from regional earthquakes recorded on a dense, 500 km long linear seismic network. Vertical components of regional records from 90 well‐located earthquakes were used to compute Rayleigh‐wave...

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Bibliographic Details
Published in:Journal of Geophysical Research. B. Solid Earth 2010-06, Vol.115 (B6), p.n/a
Main Authors: Iglesias, A., Clayton, R. W., Pérez-Campos, X., Singh, S. K., Pacheco, J. F., García, D., Valdés-González, C.
Format: Article
Language:English
Subjects:
Density
Dispersions
Earth sciences
Earth, ocean, space
Earthquakes
Exact sciences and technology
Geophysics
Inversions
MASE
Regional
S waves
Seismic activity
Seismic phenomena
Seismology
Sound waves
structure below central Mexico
surface wave tomography
Surface waves
Volcanic belts
Wave velocity
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Summary:Shear wave velocity of the crust below central Mexico is estimated using surface wave dispersion measurements from regional earthquakes recorded on a dense, 500 km long linear seismic network. Vertical components of regional records from 90 well‐located earthquakes were used to compute Rayleigh‐wave group‐velocity dispersion curves. A tomographic inversion, with high resolution in a zone close to the array, obtained for periods between 5 and 50 s reveals significant differences relative to a reference model, especially at larger periods (>30 s). A 2‐D S wave velocity model is obtained from the inversion of local dispersion curves that were reconstructed from the tomographic solutions. The results show large differences, especially in the lower crust, among back‐arc, volcanic arc, and fore‐arc regions; they also show a well‐resolved low‐velocity zone just below the active part of the Trans Mexican Volcanic Belt (TMVB) suggesting the presence of a mantle wedge. Low densities in the back arc, inferred from the low shear wave velocities, can provide isostatic support for the TMVB.
ISSN:0148-0227
2169-9313
2156-2202
2169-9356
DOI:10.1029/2009JB006332