AN EVALUATION TECHNIQUE OF SOURCE AND PATH EFFECTS USING THE KIK-NET BOREHOLE OBSERVATION RECORDS

Abstract

We construct a new method for reasonable evaluation of seismic bedrock spectra using borehole records observed at KiK-net sites. In detail, the method first reduces the observed spectra at borehole stations to seismic bedrock spectra, and then derives corner frequency and Q-value characterizing the source and path effects from the reduced spectra. We validated the applicability of the proposed method using records obtained in Kinki area. The results show that derived Q-value and stress drops calculated from derived corner frequencies are more stable and accurate than the conventional methods.