Press Release Source: TGC Industries, Inc.

TGC Industries Announces New 2006 First Quarter Earnings Release Schedule

PLANO, TEXAS – April 19, 2006 – TGC Industries, Inc. (AMEX: TGE) today announced plans to release 2006 first quarter results on Monday, April 24, 2006 before the market opens. In conjunction with the release, TGC Industries has scheduled a conference call, which will be broadcast live over the Internet, for Tuesday, April 25, 2006 at 9:30 a.m. eastern time. The Company had originally scheduled its earnings release for Monday, April 24, 2006 after the close of market.

What: TGC Industries First Quarter Earnings Conference Call

When: Tuesday, April 25, 2006 – 9:30 a.m. eastern time

How: Live via phone by dialing 303-262-2139 and asking for the TGC Industries call at least 10 minutes prior to the start time, or live over the Internet by logging onto the web at the address below

Where: http://www.tgcseismic.com

A telephonic replay of the conference call will be available through May 2, 2006 and may be accessed by calling 303-590-3000 using passcode 11058700. A web cast archive will also be available at www.tgcseismic.com shortly after the call and will be accessible for approximately 90 days.

TGC Industries, Inc., based in Plano, Texas, with a branch office in Houston, is one of the leading providers of seismic data acquisition services throughout the continental United States.

SOURCE TGC Industries, Inc.