Physics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pepi...76..179c&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 76, Issue 3-4, p. 179-187.
Physics
7
Scientific paper
The quality factor Q and the spreading rate coefficient n (assuming that the geometrical spreading function approximates r-n, where r is the hypocentral distance) are estimated using spectral amplitudes of P and S waves from earthquakes recorded in the Oaxaca, Mexico, subduction zone. The effects of the source and site response are eliminated by taking spectral ratios from pairs of source-station combinations. We formed 23 combinations for the P waves and 31 for the S waves from seven events with magnitudes in the range 3.4 < M < 4.4 digitally recorded on hard-rock sites at hypocentral distances between 19 and 76 km. We found a frequency-independent geometrical spreading rate coefficient n = 0.5 for both P and S waves in the frequency band analyzed (1 << 25 Hz). When n is fixed at a value of one, Q increases with frequency, taking the form Qp = 22 C0.97 for P waves and Qs = 56 C1.01 for S waves. Thus the ratio of the quality factors Qp/Qs is 0.4. This low ratio of Q, and the strong frequency dependence of Q observed, suggest that scattering is an important factor contributing to the attenuation of body waves in the Oaxaca, Mexico, subduction zone.
Castro Rafael
Munguia Luis
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