EXHIBIT 10.9

                  AMENDMENT TO AGREEMENT DATED OCTOBER 30, 1998

On October 30, 1998 Geophysical de Mexico ("GdM") and Seismic International,
Inc. ("INTERNATIONAL") entered into a contract (the "Contract").  Both parties
have agreed with the execution of this amendment to modify the Contract to
allow for different terms of payment as outlined in paragraph 3 of the
contract and to grant INTERNATIONAL additional time to perform the services as
outlined in paragraph 4 of the contract.  The two paragraphs in question shall
be amended in their entirety to read as follows:

         3.   INTERNATIONAL acknowledges the receipt of FIVE HUNDRED THOUSAND
              AND NO/100 DOLLARS ($500,000.00) from GdM as part consideration
              under this Agreement.  GdM agrees to pay INTERNATIONAL an
              additional consideration of SEVEN MILLION AND NO/100 DOLLARS
              ($7,000,000).  The first 50% or THREE MILLION FIVE HUNDRED
              THOUSAND DOLLARS ($3,500,000) will be due and payable upon the
              arrival of the equipment and prior to commencement of the work. 
              The balance of THREE MILLION FIVE HUNDRED THOUSAND DOLLARS
              ($3,500,000) will be due upon delivery of the detailed map(s)
              and related information described.

         4.   INTERNATIONAL shall be given 90 days to commence the work and
              120 days to complete the detailed interpretive map(s) and 
              related information from March 31, 1999.  Geophysical de Mexico
              acknowledges that the FIVE HUNDRED THOUSAND DOLLARS ($500,000)
              advanced to NORTH AMERICAN GEOPHYSICAL on behalf of the Contract
              with INTERNATIONAL has been spent on gathering information and
              testing the site for the benefit of both parties and
              INTERNATIONAL will not be obligate to refund any funds.


Accepted:                                  Accepted:





/s/ Encino Rivera Celia               /s/ Michael G. Maguire    
____________________  March 18, 1999   _____________________  March 18, 1999
Administrator Uniro                    Michael Maguire, President
Geophysical de Mexico                  Seismic International, Inc.