Direct body-wave Q estimates in northern Baja California, Mexico

Details Direct body-wave Q estimates in northern Baja California, Mexico Direct body-wave Q estimates in northern Baja California, Mexico

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pepi..103...33c&link_type=abstract

Physics of the Earth and Planetary Interiors, v. 103, p. 33-38.

Physics

5

Scientific paper

We used direct arrivals of P and S waves recorded by the seismic network of northern Baja California (RESNOM) to estimate the quality factor Q in the Peninsular Ranges of Baja California, Mexico. Spectral amplitudes from 34 earthquakes with magnitudes between 2.2 and 4.0 were analyzed to determine attenuation functions at 17 frequencies (0.3 < f < 12.6 Hz). The estimates of Q were retrieved from the attenuation functions obtained assuming a geometrical spreading function of 1/r (r being the hypocentral distance) for r < 80 km and (80r)-1/(2) for r > 80 km. Q for both P and S increases with frequency taking the form QP = 14.4f0.9 for P waves and QS = 28.3f1.0 for S waves. The ratio of QP/(QS) ≈ 0.5 obtained in northern Baja California is similar to that obtained by Hough et al. (1988) (QP/(QS) ≈ 0.54) for the Southern California Batholith near Anza, and the ratio reported by Taylor et al. (1986) for the crust and upper mantle in the Basin and Range region for high frequencies (f > 2 Hz). This result suggests that scattering effects are an important factor affecting the decay of the attenuation functions in the Peninsular ranges of Baja California.

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