A23 GROUND VISCOSITY AND STIFFNESS MEASUREMENTS USING DIFFERENT VIBRATOR CONTROL SYSTEMS Abstract 1 In early December 2003 Saudi Aramco conducted an experiment measuring ground viscosity (Gv) and stiffness (Gs) using two types of vibrator control systems currently available on its seismic crews. These measured ground attributes (Gv and Gs) are used to derive near surface velocity data that can be then used to interpolate between uphole locations. The measurements were taken over 2x2km grid an area large enough to sample varying terrain conditions: unconsolidated sand and limestone outcrop. The grid spacing of the measurements was similar to the spacing used


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