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Calculation of Qß using the spectral ratio method in Northern Baja California, Mexico

CENTRO DE INVESTIGACION CIENTIFICA Y DE EDUCACION SUPERIOR DE ENSENADA DIVISION CIENCIAS DE LA TIERRA, ESPINOZA #843, ENSENADA 22830, B.C. Mexico

Abstract

The spectral ratio method for measuring absorption in the Peninsular Ranges region of Northern Baja California has been used. A Qß from 240 to 350 was calculated in the range of frequencies from 1 to 13 Hz independent of frequency. Simple theoretical spectra of the form E(f) = [(f/fc)² +1]^–1*exp(–ftQ^–1) where is the low-frequency level, fc is the corner frequency, t is the travel time, and Q is the attenuation factor, match the observed spectra at ENX and CBX stations. The epicentral distance at ENX is about 16 and 57 km at CBX.

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