-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Tp2GRSsn6Adrv8V8/ijO2rZqYEjKHZZ4V/9F7oIr90tUU/vMRx7FHWM2XSZQhpdH
 iq65tvSCo97mt/bj0mGLGA==

<SEC-DOCUMENT>0000866609-09-000003.txt : 20090701
<SEC-HEADER>0000866609-09-000003.hdr.sgml : 20090701
<ACCEPTANCE-DATETIME>20090701112443
ACCESSION NUMBER:		0000866609-09-000003
CONFORMED SUBMISSION TYPE:	D/A
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		Rule 506
FILED AS OF DATE:		20090701
DATE AS OF CHANGE:		20090701
EFFECTIVENESS DATE:		20090701

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ION GEOPHYSICAL CORP
		CENTRAL INDEX KEY:			0000866609
		STANDARD INDUSTRIAL CLASSIFICATION:	OIL AND GAS FIELD EXPLORATION SERVICES [1382]
		IRS NUMBER:				222286646
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D/A
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-86660-9F
		FILM NUMBER:		09921157

	BUSINESS ADDRESS:	
		STREET 1:		2105 CITYWEST BLVD
		STREET 2:		SUITE 400
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			770422839
		BUSINESS PHONE:		281.933.3339

	MAIL ADDRESS:	
		STREET 1:		2105 CITYWEST BLVD
		STREET 2:		SUITE 400
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			770422839

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	INPUT OUTPUT INC
		DATE OF NAME CHANGE:	19930328
</SEC-HEADER>
<DOCUMENT>
<TYPE>D/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0401</schemaVersion>

    <submissionType>D/A</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0000866609</cik>
        <entityName>ION GEOPHYSICAL CORP</entityName>
        <issuerAddress>
            <street1>2105 CITYWEST BLVD</street1>
            <street2>SUITE 400</street2>
            <city>HOUSTON</city>
            <stateOrCountry>TX</stateOrCountry>
            <zipCode>770422839</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>281.933.3339</issuerPhoneNumber>
        <issuerPreviousNameList>
            <previousName>INPUT OUTPUT INC</previousName>
        </issuerPreviousNameList>
        <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
        <entityType>Corporation</entityType>
        <yearOfInc>
            <overFiveYears>true</overFiveYears>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>ROBERT</firstName>
                <middleName>P.</middleName>
                <lastName>PEEBLER</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2105 CITYWEST BLVD.</street1>
                <street2>SUITE 400</street2>
                <city>HOUSTON</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77042</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>CHIEF EXECUTIVE OFFICER AND DIRECTOR</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>JAMES</firstName>
                <middleName>R.</middleName>
                <lastName>HOLLIS</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2105 CITYWEST BLVD.</street1>
                <street2>SUITE 400</street2>
                <city>HOUSTON</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77042</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>PRESIDENT AND CHIEF OPERATING OFFICER</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>R.</firstName>
                <middleName>BRIAN</middleName>
                <lastName>HANSON</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2105 CITYWEST BLVD.</street1>
                <street2>SUITE 400</street2>
                <city>HOUSTON</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77042</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>EXECUTIVE VICE PRESIDENT AND CHIEF FINANCIAL OFFICER</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>TENG</firstName>
                <middleName>BENG</middleName>
                <lastName>KOID</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2105 CITYWEST BLVD.</street1>
                <street2>SUITE 400</street2>
                <city>HOUSTON</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77042</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>EXECUTIVE VICE PRESIDENT, GLOBAL BUSINESS DEVELOPMENT</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>CHRISTOPHER</firstName>
                <middleName>M.</middleName>
                <lastName>FRIEDEMANN</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2105 CITYWEST BLVD.</street1>
                <street2>SUITE 400</street2>
                <city>HOUSTON</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77042</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>SENIOR VICE PRESIDENT, CORPORATE MARKETING</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>DAVID</firstName>
                <middleName>L.</middleName>
                <lastName>ROLAND</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2105 CITYWEST BLVD.</street1>
                <street2></street2>
                <city>HOUSTON</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77042</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>SENIOR VICE PRESIDENT, GENERAL COUNSEL AND CORPORATE SECRETARY</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>MICHAEL</firstName>
                <middleName>L.</middleName>
                <lastName>MORRISON</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2105 CITYWEST BLVD.</street1>
                <street2>SUITE 400</street2>
                <city>HOUSTON</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77042</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>VICE PRESIDENT AND CORPORATE CONTROLLER</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>JAMES</firstName>
                <middleName>M.</middleName>
                <lastName>LAPEYRE, JR.</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2105 CITYWEST BLVD.</street1>
                <street2>SUITE 400</street2>
                <city>HOUSTON</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77042</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>BRUCE</firstName>
                <middleName>S.</middleName>
                <lastName>APPELBAUM</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2105 CITYWEST BLVD.</street1>
                <street2>SUITE 400</street2>
                <city>HOUSTON</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77042</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>THEODORE</firstName>
                <middleName>H.</middleName>
                <lastName>ELLIOT, JR.</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2105 CITYWEST BLVD.</street1>
                <street2>SUITE 400</street2>
                <city>HOUSTON</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77042</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>G.</firstName>
                <middleName>THOMAS</middleName>
                <lastName>MARSH</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2105 CITYWEST BLVD.</street1>
                <street2>SUITE 400</street2>
                <city>HOUSTON</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77042</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>FRANKLIN</firstName>
                <middleName></middleName>
                <lastName>MYERS</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2105 CITYWEST BLVD.</street1>
                <street2>SUITE 400</street2>
                <city>HOUSTON</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77042</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>S.</firstName>
                <middleName>JAMES</middleName>
                <lastName>NELSON, JR.</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2105 CITYWEST BLVD.</street1>
                <street2>SUITE 400</street2>
                <city>HOUSTON</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77042</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>JOHN</firstName>
                <middleName>N.</middleName>
                <lastName>SEITZ</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2105 CITYWEST BLVD.</street1>
                <street2>SUITE 400</street2>
                <city>HOUSTON</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77042</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>NICHOLAS</firstName>
                <middleName>G.</middleName>
                <lastName>VLAHAKIS</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2105 CITYWEST BLVD.</street1>
                <street2>SUITE 400</street2>
                <city>HOUSTON</city>
                <stateOrCountry>TX</stateOrCountry>
                <zipCode>77042</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Oil and Gas</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Over $100,000,000</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>true</isAmendment>
                <previousAccessionNumber>0000866609-09-000001</previousAccessionNumber>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2009-06-01</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList>
            <recipient>
                <recipientName>BARCLAYS CAPITAL INC.</recipientName>
                <recipientCRDNumber>19714</recipientCRDNumber>
                <associatedBDName>BARCLAYS CAPITAL INC.</associatedBDName>
                <associatedBDCRDNumber>19714</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>200 PARK AVENUE</street1>
                    <street2></street2>
                    <city>NEW YORK</city>
                    <stateOrCountry>NY</stateOrCountry>
                    <zipCode>10166</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <state>CA</state>
                    <state>CO</state>
                    <state>CT</state>
                    <state>IL</state>
                    <state>KS</state>
                    <state>MD</state>
                    <state>MN</state>
                    <state>NY</state>
                    <state>NC</state>
                    <state>PA</state>
                </statesOfSolicitationList>
            </recipient>
        </salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>40700000</totalOfferingAmount>
            <totalAmountSold>40700000</totalAmountSold>
            <totalRemaining>0</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>12</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>2035000</dollarAmount>
                <isEstimate>true</isEstimate>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
                <isEstimate>true</isEstimate>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>ION GEOPHYSICAL CORP</issuerName>
                <signatureName>/s/ David L. Roland</signatureName>
                <nameOfSigner>David L. Roland</nameOfSigner>
                <signatureTitle>Sr. VP, General Counsel and Corporate Secretary</signatureTitle>
                <signatureDate>2009-07-01</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----