Seismic signal generator with a self-expanding vibrator support base

摘要

A seismic signal generator with a self-adjusting footprint base plate. A signal generator for use on paved or other hard surfaces, has a pair of tread members (preferably urethane) that are laterally slidable with respect to the reaction mass. The tread members are biased outwardly away from the reaction mass. Should slippage from the point of initial placement occur during signal generation, the biasing force will continue to move the tread members outwardly to a more stable position, thereby achieving optimum intimate contact between the generator and the surface of the ground maximizing signal transfer into and through that surface.