Papers Published

1. Blakeslee, S. and Malin, P., High-frequency site effects at two Parkfield downhole and surface stations, Bull. Seismol. Soc. Am. (USA), vol. 81 no. 2 (1991), pp. 332 - 45 .
   (last updated on 2007/04/09)

   Abstract:
   Using stacked ratios of microearthquake source spectra recorded at the surface and 200 m downhole, the authors have established the P- and S-wave site effect at two locations in Parkfield, California. The frequency responses of both sites are bimodal, being completely dominated by multiples and amplification below 10 Hz and by attenuation above 30 Hz. The data were divided into subsets based on event location and time of year. Statistical comparison of these subsets shows no systematic variation with azimuth or season. The results of the study accounts for the lack of high-frequency surface reflections in the Parkfield downhole data, but not for the lack of source scaling of Parkfield microearthquakes

   Keywords:
   seismology;