Abstract
Small local earthquakes from two aftershocks sequences in Porto dos Gaúchos, Amazon craton - Brazil were used to estimate the coda wave attenuation in the frequency band of 1 to 20 Hz. The time-domain coda-decay method of a single backscattering model is employed to estimate frequency dependence of quality factor (Qc) of coda waves. Qc values have been computed at central frequencies and (band) of 1.5 (1-2), 3.0 (2-4), 6.0 (4-8), 9.0 (6-12), 12 (8-16) and 18 (12-24) Hz in the lapse time ranging from 25 to 60 sec for five different datasets, selected according to the geotectonic environments of the stations locations as well as the ability to sample crustal structures at depths. The well known functional form Qc = (Q0±σ)f(η±σ) was determined for all dataset and for the region of Porto dos Gaúchos Qc = (117±19)f(1.13±0.02).
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