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HOUSTON, Oct. 30 /PRNewswire-FirstCall/ — ION Geophysical Corporation
(“ION”) (NYSE: IO), announced today that it will release third quarter 2007
results on Wednesday, November 7, 2007 after the market closes. In
conjunction with the release, ION has scheduled a conference call, which will
be broadcast live over the Internet, for Thursday, November 8, 2007 at 9:30
a.m. Eastern Time (8:30 a.m. Central).

    What:   ION Third Quarter 2007 Earnings Conference Call

    When:   Thursday, November 8, 2007 - 9:30 a.m. Eastern Time

    How:    Live via phone - By dialing (303) 262-2131 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 22, 2007, and may be accessed by calling (303) 590-
3000 using pass code 11099838. Also, an archive of the webcast will be
available shortly after the call on the company’s website at 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 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 (Investor relations)
(281) 879-3672

Jack Lascar, Partner
Karen Roan, SVP
DRG&E (713) 529-6600

SOURCE ION Geophysical Corporation
Web site: http://www.iongeo.com
(IO)