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HOUSTON, Oct. 29 /PRNewswire-FirstCall/ — ION Geophysical Corporation
(NYSE: IO) announced today that it will release third quarter 2008 results on
Tuesday, November 4, 2008 after the market closes. In conjunction with the
release, ION has scheduled a conference call, which will be broadcast live
over the Internet, for Wednesday, November 5, 2008 at 10:00 a.m. Eastern Time
(9:00 a.m. Central).

    What:  ION Third Quarter 2008 Earnings Conference Call

    When:  Wednesday, November 5, 2008 - 10:00 a.m. Eastern Time

    How:   Live via phone - By dialing (303) 242-0003 and asking for the ION
           call at least 10 minutes prior to the start time.
           Live over the Internet - by logging on to the web at the address
           below.

    Where: http://www.iongeo.com.  The webcast can be accessed from the home
           page.

For those who cannot listen to the live call, a telephonic replay will be
available through November 19, 2008, and may be accessed by calling
(303) 590-3000 using pass code 11121267#. Also, an archive of the webcast
will be available shortly after the call on the company’s website at
http://www.iongeo.com for approximately 12 months.

About ION

ION is a leading provider of geophysical technology, services, and
solutions for the global oil & gas industry. ION’s offerings allow E&P
operators to obtain higher resolution images of the subsurface to reduce the
risk of exploration and reservoir development, and enable seismic contractors
to acquire geophysical data more efficiently. Additional information about
ION is available at http://www.iongeo.com.

The information included herein contains forward-looking statements within
the meaning of Section 27A of the Securities Act of 1933 and Section 21E of
the Securities Exchange Act of 1934. Actual results may vary fundamentally
from those described in these forward-looking statements. All forward-looking
statements reflect numerous assumptions and involve a number of risks and
uncertainties. These risks and uncertainties include risk factors that are
disclosed by ION from time to time in its filings with the Securities and
Exchange Commission.

Contacts: R. Brian Hanson
Chief Financial Officer
ION Geophysical
(281) 879-3672

Jack Lascar
DRG&E (713) 529-6600

SOURCE ION Geophysical Corporation

CONTACT: R. Brian Hanson, Chief Financial Officer of ION Geophysical,
+1-281-879-3672; or Jack Lascar of DRG&E, +1-713-529-6600, for ION
Geophysical
Web site: http://www.iongeo.com
(IO)