Vibroseis
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Vibroseis is a method used in exploration seismology to propagate energy signals into the earth over an extended period of time as opposed to the near instantaneous energy provided by an impulsive source such as explosives or weight-drop trucks. The data recorded in this way must correlated to convert the extended source signal into an impulse. The signal was originally generated by a servo-controlled hydraulic vibrator or shaker unit mounted on a mobile base unit but electro-mechanical versions have also been developed.
Vibroseis was developed by the Continental Oil Company (Conoco) during the 1950s and was a trademark until the company's patent elapsed.