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HOUSTON, April 29 /PRNewswire-FirstCall/ — ION Geophysical Corporation
(NYSE: IO) announced today that it will release first quarter 2009 financial
results on Wednesday, May 6, 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, May 7, 2009 at 10:00 a.m. Eastern Time
(9:00 a.m. Central).

    What:   ION First Quarter 2009 Earnings Conference Call

    When:   Thursday, May 7, 2009 - 10:00 a.m. Eastern Time

    How:    Live via phone - By dialing (480) 629-9726 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 May 21, 2009, and may be accessed by calling (303) 590-3000
using pass code 4062393#. 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

    -0-                           04/29/2009
    /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)

CO:  ION Geophysical Corporation

ST:  Texas
IN:  OIL
SU:  CCA

PR
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