This NOTE MODIFICATION, RENEWAL AND EXTENSION Agreement (this "Agreement") is entered into as of February 22, 2013, by and between FROST BANK, a Texas state bank, formerly known as The Frost National Bank ("Lender") and GEOSPACE TECHNOLOGIES CORPORATION, a Delaware corporation, formerly known as OYO Geospace Corporation ("Borrower").

1. On March 2, 2011, Borrower, Guarantors (as defined in the Loan Agreement) and Lender entered into that certain Loan Agreement, as amended by that certain First Amendment to Loan Agreement dated March 2, 2011, that certain Second Amendment to Loan Agreement dated April 24, 2012, and that certain Third Amendment to Loan Agreement of even date herewith (as amended, modified and restated, the "Loan Agreement"), concerning, inter alia, the terms, conditions and covenants of a certain Loans (as defined in the Loan Agreement).
2. The Loan is evidenced by, and Lender is the sole owner and holder of, that one certain Revolving Promissory Note (the "Note") dated March 2, 2011, executed by Borrower and payable to the order of Lender in the original face amount of TWENTY-FIVE MILLION AND NO/100 DOLLARS ($25,000,000.00). The Note, Loan Agreement and all other documents evidencing, securing, governing, guaranteeing and/or pertaining to the Note are hereafter collectively referred to as the "Loan Documents."
3. The Note matures in accordance with its terms on March 2, 2014.
4. Borrower and Lender have agreed to extend the maturity date of the Note and to modify certain provisions of the Note, all as hereinafter provided, and in consideration thereof Borrower has made certain agreements with Lender as hereinafter more fully set forth.
5. All capitalized terms not otherwise defined herein shall have the same meanings as are set forth in the Note.

NOW, THEREFORE, for and in consideration of the premises and mutual covenants herein contained and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, Lender and Borrower hereby agree as follows:

AGREEMENTS:

1. Acknowledgment of Outstanding Balance.

The parties hereto acknowledge that the outstanding principal balance of the Note as of the date hereof is ZERO AND NO/100 DOLLARS ($0.00) and there remains to be advanced on the Note (as of the effective date hereof), pursuant to the Loan Agreement, an amount not in excess of TWENTY-FIVE MILLION AND NO/100 DOLLARS ($25,000,000.00).

2. Renewal and Extension of Maturity.

The Note is hereby renewed and the maturity of the Note is hereby extended to March 2, 2015.

3. Payment Terms.

Section 1 of the Note is hereby deleted and the following paragraph is hereby substituted in its place for all purposes:

"1. Payment Terms. Interest only on amounts outstanding hereunder shall be due and payable monthly as it accrues, on the 2nd day of each and every calendar month, beginning April 2, 2011, and continuing regularly and monthly thereafter until March 2, 2015, when the entire amount hereof, principal and accrued interest then remaining unpaid, shall be then due and payable; interest being calculated on the unpaid principal each day principal is outstanding and all payments made credited to any collection costs and late charges, to the discharge of the interest accrued and to the reduction of the principal, in such order as Lender shall determine."

4. Interest Rate.

The annual interest rate provided for in the Note shall remain as set forth in Paragraph 2 of the Note.

5. Usury. No provisions of this Agreement or the Loan Documents shall require the payment or permit the collection, application or receipt of interest in excess of the maximum permitted by applicable state or federal law. If any excess of interest in such respect is herein or in any such other instrument provided for, or shall be adjudicated to be so provided for herein or in any such instrument, the provisions of this paragraph shall govern, and neither Borrower nor any endorsers of the Note nor their respective successors, assigns or personal representatives shall be obligated to pay the amount of such interest to the extent it is in excess of the amount permitted by applicable law. It is expressly stipulated and agreed to be the intent of Borrower and Lender to at all times comply with the usury and other laws relating to the Loan Documents and any subsequent revisions, repeals or judicial interpretations thereof, to the extent applicable thereto. In the event Lender or other holder of the Note ever receives, collects or applies as interest any such excess, such amount which would be excessive interest shall be applied to the reduction of the unpaid principal balance of the Note and, if upon such application the principal balance of the Note is paid in full, any remaining excess shall be forthwith paid to Borrower and the provisions of the Loan Documents shall immediately be deemed reformed and the amounts thereafter collectible thereunder reduced, without the necessity of execution of any new document, so as to comply with the then applicable law, but so as to permit the recovery of the fullest amount otherwise called for thereunder. In determining whether or not the interest paid or payable under any specific contingency exceeds the maximum interest allowed to be charged by applicable law, Borrower and Lender or other holder hereof shall, to the maximum extent permitted under applicable law, amortize, prorate, allocate and spread the total amount of interest throughout the entire term of the Note so that the amount or rate of interest charged for any and all periods of time during the term of the Note is to the greatest extent possible less than the maximum amount or rate of interest allowed to be charged by law during the relevant period of time. Notwithstanding any of the foregoing, if at any time applicable laws shall be changed so as to permit a higher rate or amount of interest to be charged than that permitted prior to such change, then unless prohibited by law, references in the Note to "applicable law," for purposes of determining the maximum interest or rate of interest that can be charged shall be deemed to refer to such applicable law as so amended to allow the greater amount or rate of interest.

6. RELEASE AND WAIVER OF CLAIMS. IN CONSIDERATION OF (I) THE MODIFICATION OF CERTAIN PROVISIONS OF THE NOTE, AS HEREIN PROVIDED, AND (II) THE OTHER BENEFITS RECEIVED BY BORROWER HEREUNDER, BORROWER HEREBY RELEASES, RELINQUISHES AND FOREVER DISCHARGES LENDER, AS WELL AS ITS PREDECESSORS, SUCCESSORS, ASSIGNS, AGENTS, OFFICERS, DIRECTORS, EMPLOYEES AND REPRESENTATIVES, OF AND FROM ANY AND ALL CLAIMS, DEMANDS, ACTIONS AND CAUSES OF ACTION OF WHICH BORROWER HAS ACTUAL KNOWLEDGE ON THE DATE HEREOF, OF ANY AND EVERY KIND OR CHARACTER, PAST OR PRESENT, WHICH BORROWER MAY HAVE AGAINST LENDER AND ITS PREDECESSORS, SUCCESSORS, ASSIGNS, AGENTS, OFFICERS, DIRECTORS, EMPLOYEES AND REPRESENTATIVES ARISING OUT OF OR WITH RESPECT TO (A) ANY RIGHT OR POWER TO BRING ANY CLAIM AGAINST LENDER FOR USURY OR TO PURSUE ANY CAUSE OF ACTION AGAINST LENDER BASED ON ANY CLAIM OF USURY, AND (B) ANY AND ALL TRANSACTIONS RELATING TO THE LOAN DOCUMENTS OCCURRING PRIOR TO THE DATE HEREOF, INCLUDING ANY LOSS, COST OR DAMAGE, OF ANY KIND OR CHARACTER, ARISING OUT OF OR IN ANY WAY CONNECTED WITH OR IN ANY WAY RESULTING FROM THE ACTS, ACTIONS OR OMISSIONS OF LENDER, AND ITS PREDECESSORS, SUCCESSORS, ASSIGNS, AGENTS, OFFICERS, DIRECTORS, EMPLOYEES AND REPRESENTATIVES, INCLUDING ANY BREACH OF FIDUCIARY DUTY, BREACH OF ANY DUTY OF FAIR DEALING, BREACH OF CONFIDENCE, BREACH OF FUNDING COMMITMENT, UNDUE INFLUENCE, DURESS, ECONOMIC COERCION, CONFLICT OF INTEREST, NEGLIGENCE, BAD FAITH, MALPRACTICE, INTENTIONAL OR NEGLIGENT INFLICTION OF MENTAL DISTRESS, TORTIOUS INTERFERENCE WITH CONTRACTUAL RELATIONS, TORTIOUS INTERFERENCE WITH CORPORATE GOVERNANCE OR PROSPECTIVE BUSINESS ADVANTAGE, BREACH OF CONTRACT, DECEPTIVE TRADE PRACTICES, LIBEL, SLANDER OR CONSPIRACY, BUT IN EACH CASE ONLY TO THE EXTENT PERMITTED BY APPLICABLE LAW.

7. Reaffirmation of Representations, Etc. Borrower hereby reaffirms to Lender each of the representations, warranties, covenants and agreements of Borrower set forth in the Loan Documents.

8. Enforceable Obligations. Borrower hereby ratifies, affirms, reaffirms, acknowledges, confirms and agrees that the Loan Documents represent valid and enforceable obligations of Borrower, and Borrower further acknowledges that there are no existing claims, defenses, personal or otherwise, or rights of setoff whatsoever with respect to the Note, and Borrower further acknowledges and represents that no event has occurred and no condition exists which would constitute a default under the Loan Documents or this Agreement, either with or without notice or lapse of time, or both.

9. No Release of Liens. This Agreement in no way acts as a release or relinquishment of the liens, security interests and rights (the "Liens") created or evidenced by the Pledge and Security Agreement. The Liens are hereby ratified and confirmed by Borrower in all respects and are extended to secure (i) the principal amount of the Note, (ii) all interest, charges and other sums payable with respect thereto, and (iii) the performance of all other obligations under the Pledge and Security Agreement.

10. Additional Renewals and Extensions. Notwithstanding anything to the contrary contained herein or inferred hereby or in any other instrument executed by Borrower or in any other action or conduct undertaken by Borrower on or before the date hereof, the agreements, covenants and provisions contained herein shall constitute the only evidence of Lender's consent to extend the terms and provisions of the Loan Documents in the manner set forth herein. No express or implied consent to any further extensions and/or modifications involving any of the matters set forth in this Agreement or otherwise, shall be inferred or implied from Lender's execution of this Agreement. Further, Lender's execution of this Agreement shall not constitute a waiver (either express or implied) of the requirement that any further extensions and/or modifications of the Loan Documents shall require the express written approval of Lender, no such approval (either express or implied) having been given as of the date hereof.

11. Miscellaneous.

1. As modified hereby, the provisions of the Note shall continue in full force and effect, and Borrower acknowledges and reaffirms its liability to Lender thereunder. In the event of any inconsistency between this Agreement and the terms of the Loan Documents, this Agreement shall govern.
2. Borrower hereby agrees to pay all reasonable out-of-pocket costs and expenses incurred by Lender in connection with the execution and administration of this Agreement and the modification of the Loan Documents including, but not limited to, reasonable legal fees incurred by Lender and filing fees.
3. Any default by Borrower in the performance of its obligations herein contained shall constitute a default under the Loan Documents and shall allow Lender to exercise all of its remedies set forth in the Loan Documents.
4. Lender does not, by its execution of this Agreement, waive any rights it may have against any person not a party to this Agreement.
5. In case any of the provisions of this Agreement shall for any reason be held to be invalid, illegal or unenforceable, such invalidity, illegality or unenforceability shall not affect any other provision hereof, and this Agreement shall be construed as if such invalid, illegal or unenforceable provision had never been contained herein.
6. This Agreement and the Loan Documents shall be governed and construed according to the laws of the State of Texas (without regard to any conflict of laws principles) and the applicable laws of the United States.
7. This Agreement shall be binding upon and inure to the benefit of Lender, Borrower and their respective successors, assigns and legal representatives.
8. Borrower hereby acknowledges and agrees that it has entered into this Agreement of its own free will and accord and in accordance with its own judgment after advice of its own legal counsel, and states that it has not been induced to enter into this Agreement by any statement, act or representation of any kind or character on the part of the parties hereto, except as expressly set forth in this Agreement.
9. This Agreement may be executed in multiple counterparts, each of which shall constitute an original instrument, but all of which shall constitute one and the same agreement.
10. When executed by Lender and Borrower, this Agreement shall be attached to and become a part of the Note.

NOTICE TO COMPLY WITH STATE LAW

For the purpose of this Notice, the term "WRITTEN AGREEMENT" shall include the document set forth above, together with each and every other document relating to and/or securing the same loan transaction, regardless of the date of execution.

IN WITNESS WHEREOF, Lender and Borrower have caused this Note Modification Agreement to be executed and delivered effective as of the date first above written.