Total line lengths varied from 53 to 78 m. Shots were produced from the end of the array at an offset of 15-20% of the total array length to avoid near-field effects. Impulsive sources were produced by striking a 25-cm square, 5-cm thick plastic plate with a 7.2 kg sledge hammer, and shots were stacked 8-10 times to improve the signal-to-noise ratio. Seismic data was recorded using a 16-channel Geometrics ES-3000 portable seismometer, and a 24-channel Geometrics Geode portable seismometer, using 4.5 Hz geophones spaced at 1.5 to 3 m intervals. The data are Schmidt hammer rebound values for intact rock hardness, Geological Strength Index (GSI) observations of outcrop structure and surface conditions, raw seismic velocities collected in the field, and analyzed dispersion curves and S-wave velocity profiles.
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