Studies in Data-Based Modelling

A hydraulic lifting mechanism is provided to lift and lower a seismic transducer relative to the bed of a carrier. After the transducer couples with the ground, a portion of the carrier is raised above ground to apply a predetermined static load to the transducer. Maximum static loading is accomplished by using the lift mechanism to raise one end of the carrier just clear off the ground, regardless of local surface relief. An incremental lift is then automatically added to compensate for soil compaction.