Patent ID: 8094514
Filing Date: 2012-01-10
Classification: G01V

Abstract:
1. A method for generating seismic energy for subsurface surveying, comprising: operating a first seismic vibrator and operating at least a second seismic vibrator substantially contemporaneously with the operating the first seismic vibrator, the operating the first and the at least a second seismic vibrators including applying a driver signal to each of the first and the at least a second seismic vibrators that are substantially uncorrelated with each other, each of the first and at least a second vibrators imparting energy into subsurface formations for detection after reflection from subsurface features, each of the first and the at least a second seismic vibrator having at least two resonance frequencies in a selected frequency band, wherein each of the first and at least a second vibrators comprises: wherein a mass load of the outer shell, a spring constant of the first spring and the second spring, and a mass load on the driver from the first spring are selected to result in the at least two resonance frequencies when the first and at least a second vibrators are disposed in a body of water.