Coda polarization properties of high-frequency microseismic events

Abstract

This study employs the polarization properties of microseismic events in order to estimate the volume containing the near-source scatterers associated with the coda arrivals. Two parameters, F2 and DP, were investigated, and these enabled a comparison to be made of the degree of polarization between different records. The analyses of 25 events yielded an average value for F2 of 0.57±0.06 for the P coda and 0.47±0.05 for the S coda. The corresponding values of DP were 0.66±0.08 for the P coda and 0.42±0.11 for the S coda. The P-coda was found to have a high degree of polarization over a significant portion of the coda; this was not the case for the S coda. -Authors