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Bulletin of the Seismological Society of America; October 1985; v. 75; no. 5; p. 1371-1382
© 1985 Seismological Society of America
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Estimates of seismic wave attenuation in northern Baja California

CECILIO J. REBOLLAR, CARLOS TRASLOSHEROS and ROSA ALVAREZ

CENTRO DE INVESTIGACION CIENTIFICA Y DE EDUCACION SUPERIOR DE ENSENADA, BAJA CALIFORNIA, APARTADO POSTAL 2732, ENSENADA, BAJA CALIFORNIA, 22830, Mexico

Abstract

By applying the spectral ratio method and the coda wave theory of Aki and Chouet (1975) to digital records of microearthquakes in Baja California, we have determined the seismic quality factors Q{alpha}, Qß independent of frequency, and Qc(f) and Qß(f) as a function of frequency. We found that Q{alpha} and Qß, independent of frequency and in the range from 3 to 25 Hz, increase with the difference in epicentral distance between two stations. At short distances (~ 16 km), Qß is approximately 65, and at longer distances (~83 km), Qß increases to 700. We obtained only three values of Qß/Q{alpha} (1.11, 1.47, and 0.87).

Qc(f) and Qß(f) were calculated from events recorded around the San Miguel fault at distances not greater than 30 km and source depths between 5 and 15 km. Qc(f) = (37 ± 13)f0.87±0.04 was found in the range of frequencies from 3 to 24 Hz. We found that the minimum mean free path was almost constant (15 km) for the range of frequencies analyzed. Determinations of Qß(f) were performed using two lapse times. At short lapse time (10 sec), Qß(f) was almost linear with frequency, increasing from 43 at 3 Hz to 392 at 24 Hz [Qß(f) = 13f1.03]. These values correspond to near-surface attenuation. On the other hand, at relative long lapse time (16 sec), Qß(f) increases from 147 at 3 Hz to 625 at 24 Hz [Qß(f) = 70f0.74]. These last values of Qß(f) are within the range of variation of Qc(f).




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