Cross-Hole
Cross-Hole : A seismic survey that uses two or more borings (usually just a few metres apart). A vertical impulse source is placed into one and one or more receivers (geophones) into the others. Based on the distances that the waves travel, measurement of the times of the first arrival and/or amplitude of the elastic waves, the seismic wave speeds (Vs, Vp) can be calculated and the elastic parameters of the rock/ground determined. Depending on the method used, the results give either an integral average value for the zone under study or a seismic tomography of the soil
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