Physics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...57..304c&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 57, Issue 3-4, p. 304-310.
Physics
10
Scientific paper
Coda-Q for P- and S-waves has been measured from digitally recorded events occurring in the La Cerdanya region of the eastern Pyrenees. Interpreted in terms of a power law, Q(f) = Q0fη, Q-coda for P-waves is characterized by Q0 = 14 and η = 1.07, and S-waves by Q0 = 14 and η = 1.13. Using a generalization of a model due to Dainty (1981), we obtain a Q model for S-waves in which intrinsic-Q is 23, the frequency dependence (ζ) of intrinsic-Q is 1.17, and the turbidity factor is 0.051. Interpreted in terms of a continuous relaxation model, where Qm is minimum Q, and τ1 and τ2 are high- and low-frequency cutoffs, respectively, the values of the parameters are Qm = 5 and τ1 = 0.37 when τ2 is assumed to be 10 000. Body wave dispersion, as computed from the differences in arrival times of the wave filtered at 3, 6, 12 and 24 Hz relative to that at 6 Hz has been measured and found to range from 0.067 at 3 Hz to -0.075 at 24 Hz. This dispersion constrains τ2 to be 43.
Correig Antoni M.
Mitchell Brian J.
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