Papers Published

1. Malin, P.E. and Waller, J.A., Preliminary results from vertical seismic profiling of Oroville microearthquake S-waves, Geophys. Res. Lett. (USA), vol. 12 no. 3 (1985), pp. 137 - 40 .
   (last updated on 2007/04/09)

   Abstract:
   Seismograms recorded along a 0.5 km-deep borehole in Oroville, CA, show that ground-level s-wave velocity spectra at this location are a product of site effects. In the 6.25 to 50 Hz range studied, both the Cleveland Hill fault, through which the borehole was drilled, and the rock above it contribute to a substantial loss of s-wave energy. In first-order approximation, the average apparent s-wave quality factor, Q_s^a, along the well is 9. Across the fault zone the Q_s^a drops to a low of 3. Downhole, the seismograms can readily be separated into longitudinal and transverse components

   Keywords:
   Earth crust;geology;seismology;