Coda wave attenuation in Mara Rosa seismic zone

Small local earthquakes from aftershock sequence in Mara Rosa, Goiás state, 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 (Q...

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Main Authors: schmidt, kellin, Ferreira, Vinicius, Vieira Barros, Lucas, Quintero, Ronnie
Format: Otro
Language: Inglés
Published: Sociedade Brasileira de Geofísica 2023
Subjects:
Online Access: http://hdl.handle.net/11056/24819
https://doi.org/10.1190/sbgf2013-369
Summary: Small local earthquakes from aftershock sequence in Mara Rosa, Goiás state, 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 modeled using Qc = Q0fη, Q0 is the coda quality factor at a frequency of 1 Hz and η is the frequency parameter. 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 5 to 25 sec in step of 5 seconds. It was determined the functional form Qc = (10.78) f(1.84)) .