Q-coda estimation in the Kaapvaal Craton
DJ Birch, A Cichowicz, D Grobbelaar
The Q-coda method for estimating the quality factor Q(f)= Qo(f)n was used
to characterize seismic wave attenuation in a region of the Kaapvaal
Craton that includes the mining areas of the Bushveld Complex and
Witwatersrand Basin. Seismic waveform data, collected by locally distant
stations of the South African National Seismograph Network (SANSN),
consisted of mining-related events with magnitudes ranging from ML 1.8
to ML 4. Q was calculated for nine different source-receiver pairs spanning
the study region. A weighted average Q based on the number of available
data gave an estimated attenuation relation for the study region of Q(f) =
327 f 0.81.
Keywords: seismic wave attenuation, coda waves, Q-coda method.