Adaptive preset force level control for a seismic vibrator

Apparatus and method for generating a seismic source signal

Apparatus for generating elliptically polarized shear waves

Apparatus for generating elliptically polarized shear waves

Apparatus for inducing elliptically polarized shear waves in an

Automatic force control for a seismic vibrator

Broad-band hydraulic vibrator

Control system for inclined impact-type surface seismic source

Device for seismic emission in an underground formation and...

Digital drive and phase-lock for seismic vibrators

Dual-mode vibrator

Efficient seismic data acquisition with source separation

Electromagnetic vibrator for seismic and civil-engineering appli

Enclosure for suppression of air-coupled noise produced by seism

Force or pressure feedback control for seismic vibrators

Full wave field vibratory seismic source

Generating seismic vibrator signals

Geophysical exploration system using seismic vibrator source...

Hydraulic vibrator with wide dynamic range

Inclinable vibratory seismic source