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Título del libro: Society Of Exploration Geophysicists International Exposition And 81st Annual Meeting 2011, Seg 2011
Título del capítulo: Joint inversion of three-component microtremor measurements and microtremor array measurements at Mexico City

Autores UNAM:
EFRAIN OVANDO SHELLEY;
Autores externos:

Idioma:
Inglés
Año de publicación:
2011
Palabras clave:

Acoustic wave velocity; Geophysical prospecting; Shear waves; Wave propagation; Dispersion curves; Joint inversion; Low velocity layers; Micro-tremor measurements; Microtremor array; Peak frequencies; Three component; Triangular arrays; Dispersion (waves)


Resumen:

Three-component microtremor measurements and microtremor array measurements have been performed at 6 points in central Mexico City. The microtremor array measurements used 25 to 650m triangular arrays and clear dispersion curves were obtained between 0.3 and 10 Hz. The peak frequencies of the horizontal and vertical ratio (H/V) of spectra vary from 0.25 to 2Hz. A joint inversion of an H/V spectrum and a dispersion curve is applied to observed data and S-wave velocity models down to a depth of 200m were obtained. A low-velocity layer with S-wave velocity lower than 150m/s existed at a depth of 70m at the middle of the Mexico basin. It seems that the peak frequency of 0.25Hz in the H/V spectra is due to this shallow low-velocity layer. © 2011 SEG.


Entidades citadas de la UNAM: