Exhibit 99.1

                  Informational Addendum to Report on Form 10-K
            Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

            Not Filed Pursuant to the Securities Exchange Act of 1934

The undersigned Chief Executive Officer of OYO Geospace Corporation do hereby
certify as follows:

          Solely for the purpose of meeting the requirements of Section 906 of
          the Sarbanes-Oxley Act of 2002, and solely to the extent this
          certification may be applicable to this Report on Form 10-Q, the
          undersigned hereby certify that this Report on Form 10-Q fully
          complies with the requirements of section 13(a) or 15(d) of the
          Securities Exchange Act of 1934 and the information contained in this
          Report on Form 10-Q fairly presents, in all material respects, the
          financial condition and results of operations of OYO Geospace
          Corporation.

                                          /s/ Gary D. Owens
                               -------------------------------------------------
                               Name: Gary D. Owens
                               Title: Chief Executive Officer

                               May 12, 2003