EXHIBIT 99.2
                                                                    ------------

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002


In connection with the periodic report of Dawson Geophysical Company (the
"Company") Form 10-Q for the period ending December 31, 2002 as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), I,
Christina W. Hagan, Vice President and Chief Financial Officer of the Company,
certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906
of the Sarbanes-Oxley Act of 2002, that:

     (1)  The Report fully complies with the requirements of Section 13 (a) or
          15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d);
          and

     (2)  The information contained in the Report fairly presents, in all
          material respects, the financial condition and results of operations
          of the Company.



Dated: January 28, 2003                  /s/ Christina W. Hagan
                                         ----------------------------
                                         Vice President and Chief
                                         Financial Officer