|        |
|--------|
|        |  |
| T      | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |
|   | For the Fiscal Year Ended December 31, 2012 |

|        |
|--------|
|        |  |
|  ̈ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |

|                                                               |
|---------------------------------------------------------------|
|                                                               |  |  |
| Delaware                                                      |   | 22-2286646 |
| (State or Other Jurisdiction ofIncorporation or Organization) |   | (I.R.S. EmployerIdentification No.) |

|                               |
|-------------------------------|
|                               |  |  |
| Title of Each Class           |   | Name of Each Exchange on Which Registered |
| Common Stock, $0.01 par value |   | New York Stock Exchange |

|                                    |
|------------------------------------|
|                                    |  |  |  |  |  |  |
| Large accelerated filer          x |   | Accelerated filer             ̈ |   | Non-accelerated filer           ̈ |   | Smaller reporting company      ̈ |

|                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------|
|                                                                                                                                             |  |  |
| Document                                                                                                                                    |    | Parts Into Which Incorporated |
| Portions of the Proxy Statement for the Annual Meeting of Stockholders to be held May 22, 2013, to be filed pursuant to Regulation 14A |    | Part III |

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|                  |
|------------------|
|                  |  |  |
|             |   |   |
| Explanatory Note |   | 3 |
| PART IV          |   | 4 |
| SIGNATURES       |   | 8 |
| EXHIBIT INDEX    |   | 10 |
| EX-23.2          |   |   |
| EX-23.3          |   |   |
| EX-31.1          |   |   |
| EX-31.2          |   |   |
| EX-32.1          |   |   |
| EX-32.2          |   |   |
| EX-99.1          |   |   |

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|        |
|--------|
|        |  |  |  |  |
| (a)    |   | List of Documents Filed |
|   |   |   |   |   |
|   |   | (1) |   | Financial Statements |
|   |   |   |   |   |
|   |   | The financial statements were previously filed with the Annual Report on Form 10-K for the year ended December 31, 2012, filed on February 19, 2013. |
|   |   |   |   |   |
|   |   | (2) |   | Financial Statement Schedules |
|   |   |   |   |   |
|   |   | The following financial statement schedule was previously filed with the Annual Report on Form 10-K for the year ended December 31, 2012, filed on February 19, 2013: |
|   |   |   |   |   |
|   |   | Schedule II — Valuation and Qualifying Accounts |
|   |   |   |   |   |
|   |   | The following financial statement schedule is included in this Amendment No. 1 to Annual Report on Form 10-K/A pursuant to Rule 3-09 of Regulation S-K: |
|   |   |   |   |   |
|   |   | INOVA Geophysical Equipment Limited Audited Financial Statements as of and for the periods ended December 31, 2012, 2011 and 2010. |
|   |   |   |   |   |
|   |   | All other schedules are omitted because they are not applicable or the requested information is shown in the financial statements or noted therein. |
|   |   |   |   |   |
|   |   | (3) |   | Exhibits |
|   |   |   |   |   |
| 3.1    |   | — |   | Restated Certificate of Incorporation dated September 24, 2007 filed on September 24, 2007 as Exhibit 3.4 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| 3.2    |   | — |   | Amended and Restated Bylaws of ION Geophysical Corporation filed on September 24, 2007 as Exhibit 3.5 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| 3.3    |   | — |   | Certificate of Ownership and Merger merging ION Geophysical Corporation with and into Input/Output, Inc. dated September 21, 2007, filed on September 24, 2007 as Exhibit 3.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| 4.1    |   | — |   | Certificate of Rights and Designations of Series D-1 Cumulative Convertible Preferred Stock, dated February 16, 2005 and filed on February 17, 2005 as Exhibit 3.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| 4.2    |   | — |   | Certificate of Elimination of Series B Preferred Stock dated September 24, 2007, filed on September 24, 2007 as Exhibit 3.2 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| 4.3    |   | — |   | Certificate of Elimination of Series C Preferred Stock dated September 24, 2007, filed on September 24, 2007 as Exhibit 3.3 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| 4.4    |   | — |   | Certificate of Designation of Series D-2 Cumulative Convertible Preferred Stock dated December 6, 2007, filed on December 6, 2007 as Exhibit 3.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| 4.5    |   | — |   | Certificate of Designations of Series A Junior Participating Preferred Stock of ION Geophysical Corporation effective as of December 31, 2008, filed on January 5, 2009 as Exhibit 3.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| 4.6    |   | — |   | Form of Senior Indenture, filed on December 19, 2008 as Exhibit 4.3 to the Company’s Registration Statement on Form S-3 (Registration No. 333-156362) and incorporated herein by reference. |
| 4.7    |   | — |   | Form of Senior Note, filed on December 19, 2008 as Exhibit 4.4 to the Company’s Registration Statement on Form S-3 (Registration No. 333-156362) and incorporated herein by reference. |
| 4.8    |   | — |   | Form of Subordinated Indenture, filed on December 19, 2008 as Exhibit 4.5 to the Company’s Registration Statement on Form S-3 (Registration No. 333-156362) and incorporated herein by reference. |
| 4.9    |    | — |    | Form of Subordinated Note, filed on December 19, 2008 as Exhibit 4.6 to the Company’s Registration Statement on Form S-3 (Registration No. 333-156362) and incorporated herein by reference. |

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|         |
|---------|
|         |  |  |  |  |
| 4.10    |    | — |    | Certificate of Elimination of Series A Junior Participating Preferred Stock dated February 10, 2012, filed on February 13, 2012 as Exhibit 3.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| **10.1  |    | — |    | Amended and Restated 1990 Stock Option Plan, filed on June 9, 1999 as Exhibit 4.2 to the Company’s Registration Statement on Form S-8 (Registration No. 333-80299), and incorporated herein by reference. |
| 10.2    |    | — |    | Office and Industrial/Commercial Lease dated June 2005 by and between Stafford Office Park II, LP as Landlord and Input/Output, Inc. as Tenant, filed on March 31, 2006 as Exhibit 10.2 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2005, and incorporated herein by reference. |
| 10.3    |    | — |    | Office and Industrial/Commercial Lease dated June 2005 by and between Stafford Office Park District as Landlord and Input/Output, Inc. as Tenant, filed on March 31, 2006 as Exhibit 10.3 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2005, and incorporated herein by reference. |
| **10.4  |    | — |    | Input/Output, Inc. Amended and Restated 1996 Non-Employee Director Stock Option Plan, filed on June 9, 1999 as Exhibit 4.3 to the Company’s Registration Statement on Form S-8 (Registration No. 333-80299), and incorporated herein by reference. |
| **10.5  |    | — |    | Amendment No. 1 to the Input/Output, Inc. Amended and Restated 1996 Non-Employee Director Stock Option Plan dated September 13, 1999 filed on November 14, 1999 as Exhibit 10.4 to the Company’s Quarterly Report on Form 10-Q for the fiscal quarter ended August 31, 1999 and incorporated herein by reference. |
| **10.6  |    | — |    | Input/Output, Inc. Employee Stock Purchase Plan, filed on March 28, 1997 as Exhibit 4.4 to the Company’s Registration Statement on Form S-8 (Registration No. 333-24125), and incorporated herein by reference. |
| **10.7  |    | — |    | Fifth Amended and Restated - 2004 Long-Term Incentive Plan, filed as Appendix A to the definitive proxy statement for the 2010 Annual Meeting of Stockholders of ION Geophysical Corporation, filed on April 21, 2010, and incorporated herein by reference. |
| 10.8    |    | — |    | Registration Rights Agreement dated as of November 16, 1998, by and among the Company and The Laitram Corporation, filed on March 12, 2004 as Exhibit 10.7 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2003, and incorporated herein by reference. |
| **10.9  |    | — |    | Input/Output, Inc. 1998 Restricted Stock Plan dated as of June 1, 1998, filed on June 9, 1999 as Exhibit 4.7 to the Company’s Registration Statement on S-8 (Registration No. 333-80297), and incorporated herein by reference. |
| **10.10 |    | — |    | Input/Output Inc. Non-qualified Deferred Compensation Plan, filed on April 1, 2002 as Exhibit 10.14 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2001, and incorporated herein by reference. |
| **10.11 |    | — |    | Input/Output, Inc. 2000 Restricted Stock Plan, effective as of March 13, 2000, filed on August 17, 2000 as Exhibit 10.27 to the Company’s Annual Report on Form 10-K for the fiscal year ended May 31, 2000, and incorporated herein by reference. |
| **10.12 |    | — |    | Input/Output, Inc. 2000 Long-Term Incentive Plan, filed on November 6, 2000 as Exhibit 4.7 to the Company’s Registration Statement on Form S-8 (Registration No. 333-49382), and incorporated by reference herein. |
| **10.13 |    | — |    | Employment Agreement dated effective as of March 31, 2003, by and between the Company and Robert P. Peebler, filed on March 31, 2003 as Exhibit 10.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| **10.14 |    | — |    | First Amendment to Employment Agreement dated September 6, 2006, between Input/Output, Inc. and Robert P. Peebler, filed on September 7, 2006, as Exhibit 10.1 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| **10.15 |    | — |    | Second Amendment to Employment Agreement dated February 16, 2007, between Input/Output, Inc. and Robert P. Peebler, filed on February 16, 2007 as Exhibit 10.1 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| **10.16 |    | — |    | Third Amendment to Employment Agreement dated as of August 20, 2007 between Input/Output, Inc. and Robert P. Peebler, filed on August 21, 2007 as Exhibit 10.2 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| **10.17 |    | — |    | Fourth Amendment to Employment Agreement, dated as of January 26, 2009, between ION Geophysical Corporation and Robert P. Peebler, filed on January 29, 2009 as Exhibit 10.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| **10.18 |    | — |    | Employment Agreement dated effective as of June 15, 2004, by and between the Company and David L. Roland, filed on August 9, 2004 as Exhibit 10.5 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004, and incorporated herein by reference. |

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|         |
|---------|
|         |  |  |  |  |
| **10.19 |    | — |    | GX Technology Corporation Employee Stock Option Plan, filed on August 9, 2004 as Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004, and incorporated herein by reference. |
| 10.20   |   | — |   | Concept Systems Holdings Limited Share Acquisition Agreement dated February 23, 2004, filed on March 5, 2004 as Exhibit 2.1 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| 10.21   |   | — |   | Registration Rights Agreement by and between ION Geophysical Corporation and 1236929 Alberta Ltd. dated September 18, 2008, filed on November 7, 2008 as Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q and incorporated herein by reference. |
| **10.22 |   | — |   | Form of Employment Inducement Stock Option Agreement for the Input/Output, Inc. — Concept Systems Employment Inducement Stock Option Program, filed on July 27, 2004 as Exhibit 4.1 to the Company’s Registration Statement on Form S-8 (Reg. No. 333-117716), and incorporated herein by reference. |
| **10.23 |   | — |   | Form of Employee Stock Option Award Agreement for ARAM Systems Employee Inducement Stock Option Program, filed on November 14, 2008 as Exhibit 4.4 to the Company’s Registration Statement on Form S-8 (Registration No. 333-155378) and incorporated herein by reference. |
| 10.24   |   | — |   | Agreement dated as of February 15, 2005, between Input/Output, Inc. and Fletcher International, Ltd., filed on February 17, 2005 as Exhibit 10.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| 10.25   |   | — |   | First Amendment to Agreement, dated as of May 6, 2005, between the Company and Fletcher International, Ltd., filed on May 10, 2005 as Exhibit 10.2 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| **10.26 |   | — |   | Input/Output, Inc. 2003 Stock Option Plan, dated March 27, 2003, filed as Appendix B of the Company’s definitive proxy statement filed with the SEC on April 30, 2003, and incorporated herein by reference. |
| **10.27 |   | — |   | Form of Employment Inducement Stock Option Agreement for the Input/Output, Inc. — GX Technology Corporation Employment Inducement Stock Option Program, filed on April 4, 2005 as Exhibit 4.1 to the Company’s Registration Statement on Form S-8 (Reg. No. 333-123831), and incorporated herein by reference. |
| **10.28 |   | — |   | ION Stock Appreciation Rights Plan dated November 17, 2008, filed as Exhibit 10.47 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2008, and incorporated herein by reference. |
| 10.29   |   | — |   | Canadian Master Loan and Security Agreement dated as of June 29, 2009 by and among ICON ION, LLC, as lender, ION Geophysical Corporation and ARAM Rentals Corporation, a Nova Scotia corporation, filed on August 6, 2009 as Exhibit 10.3 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2009, and incorporated herein by reference. |
| 10.30   |   | — |   | Master Loan and Security Agreement (U.S.) dated as of June 29, 2009 by and among ICON ION, LLC, as lender, ION Geophysical Corporation and ARAM Seismic Rentals, Inc., a Texas corporation, filed on August 6, 2009 as Exhibit 10.4 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2009, and incorporated herein by reference. |
| 10.31   |   | — |   | Registration Rights Agreement dated as of October 23, 2009 by and between ION Geophysical Corporation and BGP Inc., China National Petroleum Corporation filed on March 1, 2010 as Exhibit 10.54 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2009, and incorporated herein by reference. |
| 10.32   |   | — |   | Stock Purchase Agreement dated as of March 19, 2010, by and between ION Geophysical Corporation and BGP Inc., China National Petroleum Corporation, filed on March 31, 2010 as Exhibit 10.1 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| 10.33   |   | — |   | Investor Rights Agreement dated as of March 25, 2010, by and between ION Geophysical Corporation and BGP Inc., China National Petroleum Corporation, filed on March 31, 2010 as Exhibit 10.2 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| 10.34   |   | — |   | Share Purchase Agreement dated as of March 24, 2010, by and among ION Geophysical Corporation, INOVA Geophysical Equipment Limited and BGP Inc., China National Petroleum Corporation, filed on March 31, 2010 as Exhibit 10.3 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| 10.35   |   | — |   | Joint Venture Agreement dated as of March 24, 2010, by and between ION Geophysical Corporation and BGP Inc., China National Petroleum Corporation, filed on March 31, 2010 as Exhibit 10.4 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| 10.36   |   | — |   | Credit Agreement dated as of March 25, 2010, by and among ION Geophysical Corporation, ION International S.À R.L. and China Merchants Bank Co., Ltd., New York Branch, as administrative agent and lender, filed on March 31, 2010 as Exhibit 10.5 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |

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|             |
|-------------|
|             |  |  |  |  |
| **10.37     |   | — |   | Fifth Amendment to Employment Agreement dated June 1, 2010, between ION Geophysical Corporation and Robert P. Peebler, filed on June 1, 2010 as Exhibit 10.1 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| **10.38     |   | — |   | Employment Agreement dated August 2, 2011, effective as of January 1, 2012, between ION Geophysical Corporation and R. Brian Hanson, filed on November 3, 2011 as Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2011, and incorporated herein by reference. |
| **10.39     |   | — |   | Employment Agreement dated effective as of November 28, 2011, between ION Geophysical Corporation and Gregory J. Heinlein, filed on December 1, 2011 as Exhibit 10.1 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| **10.40     |   | — |   | First Amendment to Credit Agreement and Loan Documents dated May 29, 2012, filed on May 29, 2012 as Exhibit 10.1 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| **10.41     |   | — |   | Consulting Services Agreement dated January 1, 2013, between ION Geophysical Corporation and The Peebler Group LLC, filed on January 4, 2013 as Exhibit 10.1 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| *21.1       |   | — |    | Subsidiaries of the Company. |
| *23.1       |   | — |    | Consent of Ernst & Young LLP. |
| †23.2 |   | — |    | Consent of Ernst & Young LLP. |
| †23.3 |   | — |    | Consent of Ernst & Young LLP. |
| *24.1       |   | — |    | The Power of Attorney is set forth on the signature page hereof. |
| †31.1 |   | — |    | Certification of Chief Executive Officer Pursuant to Rule 13a-14(a) or Rule 15d-14(a). |
| †31.2 |   | — |    | Certification of Chief Financial Officer Pursuant to Rule 13a-14(a) or Rule 15d-14(a). |
| †32.1 |   | — |    | Certification of Chief Executive Officer Pursuant to 18 U.S.C. §1350. |
| †32.2 |   | — |    | Certification of Chief Financial Officer Pursuant to 18 U.S.C. §1350. |
| †99.1 |   | — |    | INOVA Geophysical Equipment Limited Audited Financial Statements for the periods ended December 31, 2012, 2011 and 2010. |
| ***101      |   | — |    | The following materials are formatted in Extensible Business Reporting Language (XBRL): (i) Consolidated Balance Sheets at December 31, 2012 and 2011, (ii) Consolidated Statements of Operations for the years ended December 31, 2012, 2011 and 2010, (iii) Consolidated Comprehensive Income (Loss) for the years ended December 2012, 2011 and 2010, (iv) Consolidated Statements of Cash Flows for the years ended December 31, 2012, 2011 and 2010, (v) Consolidated Statements of Stockholders’ Equity for the years ended December 31, 2012, 2011 and 2010, (vi) Notes to Consolidated Financial Statements and (vii) Schedule II – Valuation and Qualifying Accounts. |

|         |
|---------|
|         |  |
| *       | Filed with ION Geophysical Corporation’s Annual Report on Form 10-K for the year ended December 31, 2012, as filed with the Securities and Exchange Commission on February 19, 2013. |
|    |   |
| **      | Management contract or compensatory plan or arrangement. |
|    |   |
| † | Filed herewith. |
|    |   |
| ***     | In accordance with Rule 406T of Regulation S-T, the XBRL-related information in Exhibit 101 to ION Geophysical Corporation’s Annual Report on Form 10-K for the year ended December 31, 2012, is deemed not filed or part of a registration statement or prospectus for purposes of sections 11 or 12 of the Securities Act, is deemed not filed for purposes of section 18 of the Exchange Act and otherwise is not subject to liability under these sections. All of the interactive files have been previously furnished with ION Geophysical Corporation’s Annual Report on Form 10-K for the year ended December 31, 2012, as filed with the Securities and Exchange Commission on February 19, 2013. |
|    |   |
| (b)     | Exhibits required by Item 601 of Regulation S-K. |
|    |   |
|    | Reference is made to subparagraph (a) (3) of this Item 15, which is incorporated herein by reference. |
|    |   |
| (c)     | Financial statement schedules. |
|    |   |
|    | The audited financial statements of INOVA Geophysical Equipment Limited referred to in subparagraph (a) (2) of this Item 15, are being filed herewith as financial statement schedules to this Amendment No. 1 to Annual Report on Form 10-K/A, in accordance with Rule 3-09 of Regulation S-X. |

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|        |
|--------|
|        |  |  |  |
|   | ION GEOPHYSICAL CORPORATION |
|   |   |   |
|   | By |   | /s/ R. Brian Hanson |
|   |   |   | R. Brian Hanson |
|   |   |   | President and Chief Executive Officer |

|                         |
|-------------------------|
|                         |  |  |  |  |
|                    |   |   |   |   |
| Name                    |    | Capacities |   | Date |
| /s/ R. BRIAN HANSON     |    | President, Chief Executive Officer and Director |   | April 17, 2013 |
| R. Brian Hanson         |    | (Principal Executive Officer) |   |   |
|                    |   |   |
| * GREGORY J. HEINLEIN   |    | Senior Vice President and Chief Financial Officer |   | April 17, 2013 |
| Gregory J. Heinlein     |    | (Principal Financial Officer) |   |   |
|                    |   |   |
| * MICHAEL L. MORRISON   |    | Vice President and Corporate Controller |   | April 17, 2013 |
| Michael L. Morrison     |    | (Principal Accounting Officer) |   |   |
|                    |   |   |
| * JAMES M. LAPEYRE, JR. |    | Chairman of the Board of Directors and Director |   | April 17, 2013 |
| James M. Lapeyre, Jr.   |    |   |   |   |
|                    |   |   |
| * DAVID H. BARR         |    | Director |   | April 17, 2013 |
| David H. Barr           |    |   |   |   |
|                    |   |   |
| * HAO HUIMIN            |    | Director |   | April 17, 2013 |
| Hao Huimin              |    |   |   |   |
|                    |   |   |
| * MICHAEL C. JENNINGS   |    | Director |   | April 17, 2013 |
| Michael C. Jennings     |    |   |   |   |
|                    |   |   |
| * FRANKLIN MYERS        |    | Director |   | April 17, 2013 |
| Franklin Myers          |    |   |   |   |
|                    |   |   |
| * S. JAMES NELSON, JR.  |    | Director |   | April 17, 2013 |
| S. James Nelson, Jr.    |    |   |   |   |
|                    |   |   |
| * JOHN N. SEITZ         |    | Director |   | April 17, 2013 |
| John N. Seitz           |    |   |   |   |

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|        |
|--------|
|        |  |  |
|   |   |   |
| *By:   |   | /s/ R. Brian Hanson |
|   |   | R. Brian Hanson |
|   |   | Attorney-in-fact |

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|        |
|--------|
|        |  |  |  |  |
| 3.1    |   | — |   | Restated Certificate of Incorporation dated September 24, 2007 filed on September 24, 2007 as Exhibit 3.4 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| 3.2    |   | — |   | Amended and Restated Bylaws of ION Geophysical Corporation filed on September 24, 2007 as Exhibit 3.5 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| 3.3    |   | — |   | Certificate of Ownership and Merger merging ION Geophysical Corporation with and into Input/Output, Inc. dated September 21, 2007, filed on September 24, 2007 as Exhibit 3.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| 4.1    |   | — |   | Certificate of Rights and Designations of Series D-1 Cumulative Convertible Preferred Stock, dated February 16, 2005 and filed on February 17, 2005 as Exhibit 3.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| 4.2    |   | — |   | Certificate of Elimination of Series B Preferred Stock dated September 24, 2007, filed on September 24, 2007 as Exhibit 3.2 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| 4.3    |   | — |   | Certificate of Elimination of Series C Preferred Stock dated September 24, 2007, filed on September 24, 2007 as Exhibit 3.3 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| 4.4    |   | — |   | Certificate of Designation of Series D-2 Cumulative Convertible Preferred Stock dated December 6, 2007, filed on December 6, 2007 as Exhibit 3.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| 4.5    |   | — |   | Certificate of Designations of Series A Junior Participating Preferred Stock of ION Geophysical Corporation effective as of December 31, 2008, filed on January 5, 2009 as Exhibit 3.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| 4.6    |   | — |   | Form of Senior Indenture, filed on December 19, 2008 as Exhibit 4.3 to the Company’s Registration Statement on Form S-3 (Registration No. 333-156362) and incorporated herein by reference. |
| 4.7    |   | — |   | Form of Senior Note, filed on December 19, 2008 as Exhibit 4.4 to the Company’s Registration Statement on Form S-3 (Registration No. 333-156362) and incorporated herein by reference. |
| 4.8    |   | — |   | Form of Subordinated Indenture, filed on December 19, 2008 as Exhibit 4.5 to the Company’s Registration Statement on Form S-3 (Registration No. 333-156362) and incorporated herein by reference. |
| 4.9    |    | — |    | Form of Subordinated Note, filed on December 19, 2008 as Exhibit 4.6 to the Company’s Registration Statement on Form S-3 (Registration No. 333-156362) and incorporated herein by reference. |
| 4.10   |    | — |    | Certificate of Elimination of Series A Junior Participating Preferred Stock dated February 10, 2012, filed on February 13, 2012 as Exhibit 3.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| **10.1 |    | — |    | Amended and Restated 1990 Stock Option Plan, filed on June 9, 1999 as Exhibit 4.2 to the Company’s Registration Statement on Form S-8 (Registration No. 333-80299), and incorporated herein by reference. |
| 10.2   |    | — |    | Office and Industrial/Commercial Lease dated June 2005 by and between Stafford Office Park II, LP as Landlord and Input/Output, Inc. as Tenant, filed on March 31, 2006 as Exhibit 10.2 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2005, and incorporated herein by reference. |
| 10.3   |    | — |    | Office and Industrial/Commercial Lease dated June 2005 by and between Stafford Office Park District as Landlord and Input/Output, Inc. as Tenant, filed on March 31, 2006 as Exhibit 10.3 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2005, and incorporated herein by reference. |
| **10.4 |    | — |    | Input/Output, Inc. Amended and Restated 1996 Non-Employee Director Stock Option Plan, filed on June 9, 1999 as Exhibit 4.3 to the Company’s Registration Statement on Form S-8 (Registration No. 333-80299), and incorporated herein by reference. |
| **10.5 |    | — |    | Amendment No. 1 to the Input/Output, Inc. Amended and Restated 1996 Non-Employee Director Stock Option Plan dated September 13, 1999 filed on November 14, 1999 as Exhibit 10.4 to the Company’s Quarterly Report on Form 10-Q for the fiscal quarter ended August 31, 1999 and incorporated herein by reference. |
| **10.6 |    | — |    | Input/Output, Inc. Employee Stock Purchase Plan, filed on March 28, 1997 as Exhibit 4.4 to the Company’s Registration Statement on Form S-8 (Registration No. 333-24125), and incorporated herein by reference. |
| **10.7 |    | — |    | Fifth Amended and Restated - 2004 Long-Term Incentive Plan, filed as Appendix A to the definitive proxy statement for the 2010 Annual Meeting of Stockholders of ION Geophysical Corporation, filed on April 21, 2010, and incorporated herein by reference. |

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|         |
|---------|
|         |  |  |  |  |
| 10.8    |    | — |    | Registration Rights Agreement dated as of November 16, 1998, by and among the Company and The Laitram Corporation, filed on March 12, 2004 as Exhibit 10.7 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2003, and incorporated herein by reference. |
| **10.9  |    | — |    | Input/Output, Inc. 1998 Restricted Stock Plan dated as of June 1, 1998, filed on June 9, 1999 as Exhibit 4.7 to the Company’s Registration Statement on S-8 (Registration No. 333-80297), and incorporated herein by reference. |
| **10.10 |    | — |    | Input/Output Inc. Non-qualified Deferred Compensation Plan, filed on April 1, 2002 as Exhibit 10.14 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2001, and incorporated herein by reference. |
| **10.11 |    | — |    | Input/Output, Inc. 2000 Restricted Stock Plan, effective as of March 13, 2000, filed on August 17, 2000 as Exhibit 10.27 to the Company’s Annual Report on Form 10-K for the fiscal year ended May 31, 2000, and incorporated herein by reference. |
| **10.12 |    | — |    | Input/Output, Inc. 2000 Long-Term Incentive Plan, filed on November 6, 2000 as Exhibit 4.7 to the Company’s Registration Statement on Form S-8 (Registration No. 333-49382), and incorporated by reference herein. |
| **10.13 |    | — |    | Employment Agreement dated effective as of March 31, 2003, by and between the Company and Robert P. Peebler, filed on March 31, 2003 as Exhibit 10.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| **10.14 |    | — |    | First Amendment to Employment Agreement dated September 6, 2006, between Input/Output, Inc. and Robert P. Peebler, filed on September 7, 2006, as Exhibit 10.1 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| **10.15 |    | — |    | Second Amendment to Employment Agreement dated February 16, 2007, between Input/Output, Inc. and Robert P. Peebler, filed on February 16, 2007 as Exhibit 10.1 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| **10.16 |    | — |    | Third Amendment to Employment Agreement dated as of August 20, 2007 between Input/Output, Inc. and Robert P. Peebler, filed on August 21, 2007 as Exhibit 10.2 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| **10.17 |    | — |    | Fourth Amendment to Employment Agreement, dated as of January 26, 2009, between ION Geophysical Corporation and Robert P. Peebler, filed on January 29, 2009 as Exhibit 10.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| **10.18 |    | — |    | Employment Agreement dated effective as of June 15, 2004, by and between the Company and David L. Roland, filed on August 9, 2004 as Exhibit 10.5 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004, and incorporated herein by reference. |
| **10.19 |    | — |    | GX Technology Corporation Employee Stock Option Plan, filed on August 9, 2004 as Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004, and incorporated herein by reference. |
| 10.20   |   | — |   | Concept Systems Holdings Limited Share Acquisition Agreement dated February 23, 2004, filed on March 5, 2004 as Exhibit 2.1 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| 10.21   |   | — |   | Registration Rights Agreement by and between ION Geophysical Corporation and 1236929 Alberta Ltd. dated September 18, 2008, filed on November 7, 2008 as Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q and incorporated herein by reference. |
| **10.22 |   | — |   | Form of Employment Inducement Stock Option Agreement for the Input/Output, Inc. — Concept Systems Employment Inducement Stock Option Program, filed on July 27, 2004 as Exhibit 4.1 to the Company’s Registration Statement on Form S-8 (Reg. No. 333-117716), and incorporated herein by reference. |
| **10.23 |   | — |   | Form of Employee Stock Option Award Agreement for ARAM Systems Employee Inducement Stock Option Program, filed on November 14, 2008 as Exhibit 4.4 to the Company’s Registration Statement on Form S-8 (Registration No. 333-155378) and incorporated herein by reference. |
| 10.24   |   | — |   | Agreement dated as of February 15, 2005, between Input/Output, Inc. and Fletcher International, Ltd., filed on February 17, 2005 as Exhibit 10.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference. |
| 10.25   |   | — |   | First Amendment to Agreement, dated as of May 6, 2005, between the Company and Fletcher International, Ltd., filed on May 10, 2005 as Exhibit 10.2 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| **10.26 |   | — |   | Input/Output, Inc. 2003 Stock Option Plan, dated March 27, 2003, filed as Appendix B of the Company’s definitive proxy statement filed with the SEC on April 30, 2003, and incorporated herein by reference. |
| **10.27 |   | — |   | Form of Employment Inducement Stock Option Agreement for the Input/Output, Inc. — GX Technology Corporation Employment Inducement Stock Option Program, filed on April 4, 2005 as Exhibit 4.1 to the Company’s Registration Statement on Form S-8 (Reg. No. 333-123831), and incorporated herein by reference. |

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| **10.28     |   | — |   | ION Stock Appreciation Rights Plan dated November 17, 2008, filed as Exhibit 10.47 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2008, and incorporated herein by reference. |
| 10.29       |   | — |   | Canadian Master Loan and Security Agreement dated as of June 29, 2009 by and among ICON ION, LLC, as lender, ION Geophysical Corporation and ARAM Rentals Corporation, a Nova Scotia corporation, filed on August 6, 2009 as Exhibit 10.3 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2009, and incorporated herein by reference. |
| 10.30       |   | — |   | Master Loan and Security Agreement (U.S.) dated as of June 29, 2009 by and among ICON ION, LLC, as lender, ION Geophysical Corporation and ARAM Seismic Rentals, Inc., a Texas corporation, filed on August 6, 2009 as Exhibit 10.4 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2009, and incorporated herein by reference. |
| 10.31       |   | — |   | Registration Rights Agreement dated as of October 23, 2009 by and between ION Geophysical Corporation and BGP Inc., China National Petroleum Corporation filed on March 1, 2010 as Exhibit 10.54 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2009, and incorporated herein by reference. |
| 10.32       |   | — |   | Stock Purchase Agreement dated as of March 19, 2010, by and between ION Geophysical Corporation and BGP Inc., China National Petroleum Corporation, filed on March 31, 2010 as Exhibit 10.1 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| 10.33       |   | — |   | Investor Rights Agreement dated as of March 25, 2010, by and between ION Geophysical Corporation and BGP Inc., China National Petroleum Corporation, filed on March 31, 2010 as Exhibit 10.2 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| 10.34       |   | — |   | Share Purchase Agreement dated as of March 24, 2010, by and among ION Geophysical Corporation, INOVA Geophysical Equipment Limited and BGP Inc., China National Petroleum Corporation, filed on March 31, 2010 as Exhibit 10.3 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| 10.35       |   | — |   | Joint Venture Agreement dated as of March 24, 2010, by and between ION Geophysical Corporation and BGP Inc., China National Petroleum Corporation, filed on March 31, 2010 as Exhibit 10.4 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| 10.36       |   | — |   | Credit Agreement dated as of March 25, 2010, by and among ION Geophysical Corporation, ION International S.À R.L. and China Merchants Bank Co., Ltd., New York Branch, as administrative agent and lender, filed on March 31, 2010 as Exhibit 10.5 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| **10.37     |   | — |   | Fifth Amendment to Employment Agreement dated June 1, 2010, between ION Geophysical Corporation and Robert P. Peebler, filed on June 1, 2010 as Exhibit 10.1 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| **10.38     |   | — |   | Employment Agreement dated August 2, 2011, effective as of January 1, 2012, between ION Geophysical Corporation and R. Brian Hanson, filed on November 3, 2011 as Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2011, and incorporated herein by reference. |
| **10.39     |   | — |   | Employment Agreement dated effective as of November 28, 2011, between ION Geophysical Corporation and Gregory J. Heinlein, filed on December 1, 2011 as Exhibit 10.1 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| **10.40     |   | — |   | First Amendment to Credit Agreement and Loan Documents dated May 29, 2012, filed on May 29, 2012 as Exhibit 10.1 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| **10.41     |   | — |   | Consulting Services Agreement dated January 1, 2013, between ION Geophysical Corporation and The Peebler Group LLC, filed on January 4, 2013 as Exhibit 10.1 to the Company’s Current Report on Form 8-K, and incorporated herein by reference. |
| *21.1       |   | — |    | Subsidiaries of the Company. |
| *23.1       |   | — |    | Consent of Ernst & Young LLP. |
| †23.2 |   | — |    | Consent of Ernst & Young LLP. |
| †23.3 |   | — |    | Consent of Ernst & Young LLP. |
| *24.1       |   | — |    | The Power of Attorney is set forth on the signature page hereof. |
| †31.1 |   | — |    | Certification of Chief Executive Officer Pursuant to Rule 13a-14(a) or Rule 15d-14(a). |
| †31.2 |   | — |    | Certification of Chief Financial Officer Pursuant to Rule 13a-14(a) or Rule 15d-14(a). |
| †32.1 |   | — |    | Certification of Chief Executive Officer Pursuant to 18 U.S.C. §1350. |
| †32.2 |   | — |    | Certification of Chief Financial Officer Pursuant to 18 U.S.C. §1350. |
| †99.1 |   | — |    | INOVA Geophysical Equipment Limited Audited Financial Statements for the periods ended December 31, 2012, 2011 and 2010. |

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| ***101 |   | — |    | The following materials are formatted in Extensible Business Reporting Language (XBRL): (i) Consolidated Balance Sheets at December 31, 2012 and 2011, (ii) Consolidated Statements of Operations for the years ended December 31, 2012, 2011 and 2010, (iii) Consolidated Comprehensive Income (Loss) for the years ended December 2012, 2011 and 2010, (iv) Consolidated Statements of Cash Flows for the years ended December 31, 2012, 2011 and 2010, (v) Consolidated Statements of Stockholders’ Equity for the years ended December 31, 2012, 2011 and 2010, (vi) Notes to Consolidated Financial Statements and (vii) Schedule II – Valuation and Qualifying Accounts. |

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| *       | Filed with ION Geophysical Corporation’s Annual Report on Form 10-K for the year ended December 31, 2012, as filed with the Securities and Exchange Commission on February 19, 2013. |
|    |   |
| **      | Management contract or compensatory plan or arrangement. |
|    |   |
| † | Filed herewith. |
|    |   |
| ***     | In accordance with Rule 406T of Regulation S-T, the XBRL-related information in Exhibit 101 to ION Geophysical Corporation’s Annual Report on Form 10-K for the year ended December 31, 2012, is deemed not filed or part of a registration statement or prospectus for purposes of sections 11 or 12 of the Securities Act, is deemed not filed for purposes of section 18 of the Exchange Act and otherwise is not subject to liability under these sections. All of the interactive files have been previously furnished with ION Geophysical Corporation’s Annual Report on Form 10-K for the year ended December 31, 2012, as filed with the Securities and Exchange Commission on February 19, 2013. |