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HOUSTON, July 31 /PRNewswire-FirstCall/ — ION Geophysical Corporation
(NYSE: IO) announced today that it will release second quarter 2009 financial
results on Wednesday, August 5, 2009 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, August 6, 2009 at 10:00 a.m. Eastern
Time
(9:00 a.m. Central).

    What:   ION Second Quarter 2009 Earnings Conference Call

    When:   Thursday, August 6, 2009 - 10:00 a.m. Eastern Time

    How:    Live via phone - By dialing (480) 248-5085 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 August 20, 2009, and may be accessed by calling (303)
590-3030 using pass code 4118276#. 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.

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

Jack Lascar
DRG&E (713) 529-6600

SOURCE ION Geophysical Corporation

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