Downhole Measurements of Shear- and Compression-Wave Velocities in Boreholes C4993, C4996, C4997 and C4998 at the Waste Treatment Plant DOE Hanford Site.
This report describes the procedures and the results of a series of downhole measurements of shear- and compression-wave velocities performed as part of the Seismic Boreholes Project at the site of the Waste Treatment Plant (WTP). The measurements were made in several stages from October 2006 through early February 2007. Although some fieldwork was carried out in conjunction with the University of Texas at Austin (UT), all data acquired by UT personnel are reported separately by that organization. The UT measurements were made using the universitys large, electrohydraulic, triaxial vibrator (T-Rex) as the energy source for both shear and compression waves. The measurements presented in this report were made using a sledgehammer or an accelerated-weight impact source (the Slingshot source). The equipment and resulting data are described and discussed in this report. The scope of work is shown in chronological order in Table 1. A full description of all procedures, equipment calibration, experimental setups, and seismograph files, together with some results, are contained in a separate Scientific Notebook that was compiled as the fieldwork progressed.
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