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Coda Q estimates in the Mount Cameroon volcanic region, West Africa

DEPARTMENT OF EARTH SCIENCES THE UNIVERSITY OF LEEDS, LEEDS, LS2 9JT United Kingdom

Abstract

Coda Q, Qc, has been determined in the Mount Cameroon volcanic region, West Africa, from the decay of the amplitudes of coda waves on narrow band-pass-filtered seismograms of local microearthquakes in the frequency range 1.5 to 24 Hz. Qc averages about 121 and 1745 at 1.5 Hz and 24 Hz, respectively, and has a frequency dependence of the form Qc = 65f. For each frequency band, the coda Q values, averaged over all the earthquakes, show an insensitivity to the compoment of the ground motion. Considering a model incorporating both scattering and intrinsic attenuation, and assuming that the attenuation is entirely due to the scattering loss, a frequency-independent minimum mean free path of about 38 km was found.

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