IN-SITU MEASUREMENT OF SEISMIC SHEAR-WAVE ABSORPTION IN THE SAN-FRANCISCO HOLOCENE BAY MUD BY THE PULSE-BROADENING METHOD

By the pulse-broadening method, seismic absorption of San Francisco Ho locene Bay Mud has been determined with the use of an impulsive shear- wave source at the surface, two receivers embedded in clay (Holocene B ay Mud), and digital seismic recording. The seismic anelastic quality factor is determined from 20 measurements to be 16.0 with a random err or of +/- 0.9. Three sources of systematic error are examined. The fra ctional systematic error on the anelastic quality factor is estimated to be approximately 11 %. Details of experimental arrangement and erro r analysis are given.