Abstract

The best method to measure the seismic vibrator output. Phase control of the force exerted by a seismic vibrator upon the Earth's surface (ground force) is useful in producing consistent downhole P-wave signatures. Experimental results which compare the downhole correlation wavelets produced by phase-locking to ground force; reaction mass acceleration and baseplate acceleration as changes in vibrator type, sweep bandwidth, drive level, and coupling medium are made. The empirical results support theoretical work which predicts with suitable assumptions that ground force and far-field particle displacement are in phase except for a time delay.--Modified journal abstract.

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