TGC Industries, Inc. (TGC), with its wholly owned subsidiary, Eagle Canada, Inc., (Eagle Canada), is a provider of seismic data acquisition services throughout the continental United States and Canada. The Company is engaged in the geophysical service business of conducting three dimensional (3-D) surveys for clients in the oil and gas business. As of December 31, 2011, the Company operated 12 seismic crews, seven in the United States and four in Canada. These seismic crews supply seismic data primarily to companies engaged in the exploration and development of oil and natural gas on land and in land-to-water transition areas. As of December 31, 2011, the Company operated 15 seismic crews. In January of 2011, the Company acquired its second new 3,000 channel GSR system. In July of 2011, the Company acquired its third new GSR system. The third GSR system contains 5,000 channels.