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Walk-away or offset Vertical Seismic Profiling (VSP), a technique widely used in oil and gas exploration, was carried out in crystalline rock at the KTB (Kontinentales Tief-Bohrprogramm) drill site in Germany. The walk-away VSP experiment comprised a shot profile of 10 km length at the surface across the well and a vertical receiver array in the borehole between 3210 m and 3560 m depth with geophone...
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