Abstract
Abstract The effect which a sedimentary basin (Granada basin, southern Spain) exercises on the estimated Q c and Q Lg attenuation values within a determined frequency range are described. It has been shown that for the values of Q c there is a decrease in the number of fits, with a correlation coefficient > 0.8 in the 1.5 Hz frequency band, in comparison with the other frequency bands. On the other hand, an overestimation of the values of the coda- Q is observed between a station located on the sediment in the interior of the basin and the stations situated on the borders of the basin. The values of the attenuation for Lg waves in the paths which cross the Granada basin show a series of peaks centred in the 1–3 Hz frequency band, which overestimate the values of Q Lg with respect to other frequency bands. All these phenomena indicate that the presence of a low-velocity sedimentary basin modifies the processes of generation of coda waves and the propagation of Lg waves.
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