GUARANTY AGREEMENT


         WHEREAS, the execution of this Guaranty Agreement is a condition to 3-D
GEOPHYSICAL,  INC., a Delaware  corporation  ("Borrower"),  borrowing money from
FIRST INTERSTATE BANK OF TEXAS, N.A., a national banking association ("Lender"),
pursuant  to that  certain  Loan  Agreement  dated as of May 26,  1996,  between
Borrower and Lender (such Loan  Agreement,  as the same may hereafter be amended
or  modified  from  time to time,  being  hereinafter  referred  to as the "Loan
Agreement");

         WHEREAS,  as of the date hereof, the Guaranteed  Indebtedness  (defined
below) includes (i) a revolving credit loan in the amount of  $3,000,000.00  and
(ii) a term loan in the original principal amount of $15,000,000.00;

         NOW, THEREFORE, for valuable consideration, the receipt and adequacy of
which are hereby acknowledged, the undersigned, Northern Geophysical of America,
Inc.,  a  Delaware   corporation  (the  "Guarantor"),   hereby  irrevocably  and
unconditionally guarantees to Lender the full and prompt payment and performance
of the Guaranteed  Indebtedness  (hereinafter defined),  this Guaranty Agreement
being upon the following terms:

         1. The term "Guaranteed Indebtedness", as used herein, means all of the
"Obligations" (as defined in the Loan Agreement), including, without limitation,
(i) that certain  promissory note in the original principal amount of $3,000,000
dated of even date herewith,  (ii) that certain  promissory note in the original
principal  amount of  $15,000,000.00  dated of even date  herewith,  each  being
executed by Borrower and payable to the order of Lender and (iii) all  renewals,
extensions and modifications  thereof. The term "Guaranteed  Indebtedness" shall
include  future  advances  and any and all  post-petition  interest and expenses
(including  attorneys'  fees)  whether  or not  allowed  under  any  bankruptcy,
insolvency, or other similar law.

         2. This instrument shall be an absolute,  continuing,  irrevocable, and
unconditional  guaranty  of  payment  and  performance,  and not a  guaranty  of
collection, and Guarantor shall remain liable on its obligations hereunder until
the payment and performance in full of the Guaranteed Indebtedness.  No set-off,
counterclaim,  recoupment,  reduction,  or diminution of any obligation,  or any
defense of any kind or nature  which  Borrower  may have  against  Lender or any
other party, or which Guarantor may have against Borrower,  Lender, or any other
party,  shall be available to, or shall be asserted by, Guarantor against Lender
or any subsequent  holder of the Guaranteed  Indebtedness or any part thereof or
against payment of the Guaranteed Indebtedness or any part thereof.

         3. If Guarantor  becomes liable for any indebtedness  owing by Borrower
to Lender by endorsement or otherwise, other than under this Guaranty Agreement,
such liability shall not be in any manner impaired or affected  hereby,  and the
rights of Lender  hereunder shall be cumulative of any and all other rights that
Lender may ever have against  Guarantor.  The exercise by Lender of any right or
remedy hereunder or under any other instrument, or at law








or in equity,  shall not preclude the  concurrent or subsequent  exercise of any
other right or remedy.

         4. In the event of default by Borrower in payment or performance of the
Guaranteed Indebtedness,  or any part thereof, when such Guaranteed Indebtedness
becomes due,  whether by its terms,  by  acceleration,  or otherwise,  Guarantor
shall  promptly pay the amount due thereon to Lender  without  notice or demand,
except as expressly provided for herein, in lawful currency of the United States
of America and it shall not be  necessary  for Lender,  in order to enforce such
payment by Guarantor,  first to institute  suit or exhaust its remedies  against
Borrower or others  liable on such  Guaranteed  Indebtedness,  or to enforce any
rights  against any  collateral  which shall ever have been given to secure such
Guaranteed  Indebtedness.  Notwithstanding anything to the contrary contained in
this Guaranty Agreement,  Guarantor hereby irrevocably waives any and all rights
it may  now  or  hereafter  have  under  any  agreement  or at law or in  equity
(including,  without limitation, any law subrogating the Guarantor to the rights
of Lender) to assert any claim against or seek contribution,  indemnification or
any other form of  reimbursement  from  Borrower or any other  party  liable for
payment of any or all of the  Guaranteed  Indebtedness  for any payment  made by
Guarantor under or in connection with this Guaranty Agreement or otherwise.

         5. If  acceleration  of the time for  payment of any amount  payable by
Borrower  under  the  Guaranteed  Indebtedness  is stayed  upon the  insolvency,
bankruptcy, or reorganization of Borrower, all such amounts otherwise subject to
acceleration under the terms of the Guaranteed Indebtedness shall nonetheless be
payable by Guarantor hereunder forthwith on demand by Lender.

         6.  Guarantor  hereby agrees that its  obligations  under this Guaranty
Agreement shall not be released, discharged,  diminished,  impaired, reduced, or
affected for any reason or by the  occurrence of any event,  including,  without
limitation,  one or more of the following events,  whether or not with notice to
or the  consent of  Guarantor:  (a) the taking or  accepting  of  collateral  as
security  for  any  or  all  of the  Guaranteed  Indebtedness  or  the  release,
surrender,  exchange,.  or  subordination  of any  collateral  now or  hereafter
securing any or all of the Guaranteed  Indebtedness;  (b) any partial release of
the  liability of  Guarantor  hereunder,  or the full or partial  release of any
other  guarantor from  liability for any or all of the Guaranteed  Indebtedness;
(c) any disability of Borrower, or the dissolution, insolvency, or bankruptcy of
Borrower,  Guarantor,  or any other  party at any time liable for the payment of
any  or  all  of  the  Guaranteed  Indebtedness;  (d)  any  renewal,  extension,
modification,  waiver,  amendment,  or  rearrangement  of  any  or  all  of  the
Guaranteed  Indebtedness or any instrument,  document,  or agreement evidencing,
securing,  or  otherwise  relating  to any or all of the  Indebtedness;  (e) any
adjustment,  indulgence,  forbearance, waiver, or compromise that may be granted
or given by Lender to  Borrower,  Guarantor,  or any other party ever liable for
any or all of the Guaranteed  Indebtedness;  (f) any neglect,  delay,  omission,
failure, or refusal of Lender to take or prosecute any action for the collection
of any of the Guaranteed  Indebtedness  or to foreclose or take or prosecute any
action in connection with any instrument, document, or agreement evidencing,

                                      - 2 -








securing,  or  otherwise  relating  to any or all of the  Indebtedness;  (g) the
unenforceability  or invalidity of any or all of the Guaranteed  Indebtedness or
of any instrument,  document,  or agreement  evidencing,  securing, or otherwise
relating  to any or all of the  Guaranteed  Indebtedness;  (h)  any  payment  by
Borrower or any other party to Lender is held to  constitute a preference  under
applicable  bankruptcy  or  insolvency  law or if for any other reason Lender is
required to refund any payment or pay the amount  thereof to someone  else;  (i)
the  settlement  or compromise of any of the  Guaranteed  Indebtedness;  (j) the
non-perfection  of any  security  interest  or lien  securing  any or all of the
Guaranteed  Indebtedness;  (k) any impairment of any collateral  securing any or
all of the  Guaranteed  Indebtedness;  (l) the  failure  of  Lender  to sell any
collateral securing any or all of the Guaranteed  Indebtedness in a commercially
reasonable  manner  or as  otherwise  required  by law;  (m) any  change  in the
corporate  existence,  structure,  or ownership  of  Borrower;  or (n) any other
circumstance  which  might  otherwise  constitute  a  defense  available  to, or
discharge of, Borrower or Guarantor.

         7. Guarantor represents and wan-ants to Lender as follows:

              (a) Guarantor is a corporation  duly organized,  validly  existing
         and  in  good  standing  under  the  laws  of the  jurisdiction  of its
         incorporation,  is  qualified  to do business in all  jurisdictions  in
         which  the  nature  of  the   business   conducted  by  it  makes  such
         qualification  necessary  and where  failure to so qualify would have a
         material  adverse  effect  on its  business,  financial  condition,  or
         operations.

              (b)  Guarantor  has the  corporate  power and  authority and legal
         right to  execute,  deliver,  and perform  its  obligations  under this
         Guaranty Agreement and this Guaranty  Agreement  constitutes the legal,
         valid,  and  binding  obligation  of  Guarantor,   enforceable  against
         Guarantor in accordance with its respective terms, except as limited by
         bankruptcy,  insolvency,  or other laws of general application relating
         to the enforcement of creditor's rights.

              (c) The execution,  delivery, and performance by Guarantor of this
         Guaranty Agreement have been duly authorized by all requisite action on
         the part of Guarantor  and do not and will not violate or conflict with
         the articles of  incorporation or bylaws of Guarantor or any law, rule,
         or  regulation or any order,  writ,  injunction or decree of any court,
         governmental authority or agency, or arbitrator and do not and will not
         conflict with, result in a breach of, or constitute a default under, or
         result  in the  imposition  of any lien upon any  assets  of  Guarantor
         pursuant to the provisions of any indenture,  mortgage,  deed of trust,
         security agreement,  franchise, permit, license, or other instrument or
         agreement to which Guarantor or its properties is bound.

              (d) No  authorization,  approval,  or consent of, and no filing or
         registration on with, any court, governmental authority, or third party
         is necessary for the execution, delivery or performance by Guarantor of
         this Guaranty Agreement or the validity or enforceability thereof.

                                      - 3 -









              (e) The value of the consideration  received and to be received by
         as a result of Borrower and Lender entering into the Loan Agreement and
         executing and delivering this Guaranty Agreement is reasonably worth at
         least as much as the liability and  obligation of Guarantor  hereunder,
         and such liability and obligation and the Loan Agreement have benefited
         and may  reasonably  be  expected  to  benefit  Guarantor  directly  or
         indirectly.

              (f) Guarantor has,  independently and without reliance upon Lender
         and based upon such  documents and  information as Guarantor has deemed
         appropriate,  made its own  analysis  and  decision  to enter into this
         Guaranty Agreement.

              (g) Guarantor hereby represents that (i) it is not insolvent as of
         the date hereof and will not be rendered  insolvent as a result of this
         Guaranty   Agreement,   (ii)  it  is  not  engaged  in  business  or  a
         transaction,  or about to engage in a business  or a  transaction,  for
         which  any  property  or  assets   remaining  with  such  Guarantor  is
         unreasonably  small capital,  and (iii) it does not intend to incur, or
         believe it will incur,  debts that will be beyond its ability to pay as
         such debts mature.

         8.  Guarantor  covenants  and agrees  that,  as long as the  Guaranteed
Indebtedness  or any part thereof is  outstanding  or Lender has any  commitment
under the Loan Agreement:

              (a) Guarantor  will furnish  promptly to Lender  written notice of
         the  occurrence  of any  default  under this  Guaranty  Agreement  or a
         Default under the Loan Agreement of which Guarantor his knowledge.

              (b)  Guarantor  will  furnish  promptly to Lender such  additional
         information concerning Guarantor as Lender may request.

              (c)  Guarantor  will  obtain at any time and from time to time all
         authorizations,  licenses,  consents  or  approvals  as  shall  now  or
         hereafter  be  necessary  or  desirable  under all  applicable  laws or
         regulations or otherwise in connection with the execution, delivery and
         performance of this Guaranty Agreement and will promptly furnish copies
         thereof to Lender.

         9. (a) Guarantor hereby agrees that the  Subordinated  Indebtedness (as
hereinafter  defined) shall be subordinate and junior in right of payment to the
prior  payment in full of all  Guaranteed  Indebtedness,  and  Guarantor  hereby
assigns the  Subordinated  Indebtedness to Lender as security for the Guaranteed
Indebtedness.  If any sums shall be paid to  Guarantor  by Borrower or any other
person or entity on account of the Subordinated Indebtedness, such sums shall be
held in trust by Guarantor for the benefit of Lender and shall forthwith be paid
to Lender  without  affecting  the  liability of Guarantor  under this  Guaranty
Agreement and may be applied by Lender  against the Guaranteed  Indebtedness  in
such order and manner as Lender may determine in its sole

                                      - 4 -








discretion.  Upon the request of Lender,  Guarantor shall execute,  deliver, and
endorse to Lender  such  documents  and  instruments  as Lender  may  request to
perfect,  preserve,  and  enforce  its rights  hereunder.  For  purposes of this
Guaranty Agreement, the term "Subordinated Indebtedness" means all indebtedness,
liabilities,   and   obligations   of  Borrower  to   Guarantor,   whether  such
indebtedness,  liabilities,  and obligations now exist or are hereafter incurred
or arise, or whether the obligations of Borrower  thereon are direct,  indirect,
contingent,  primary,  secondary,  several, joint and several, or otherwise, and
irrespective  of whether such  indebtedness,  liabilities,  or  obligations  are
evidenced by a note, contract,  open account, or otherwise,  and irrespective of
the  person  or  persons  in whose  favor  such  indebtedness,  obligations,  or
liabilities may, at their inception,  have been, or may hereafter be created, or
the manner in which they have been or may hereafter be acquired by Guarantor.

         (b)  Guarantor  agrees  that  any and all  liens,  security  interests,
judgment liens,  charges,  or other encumbrances upon Borrower's assets securing
payment  of any  Subordinated  Indebtedness  shall be and  remain  inferior  and
subordinate to any and all liens,  security interests,  judgment liens, charges,
or other  encumbrances upon Borrower's assets securing payment of the Guaranteed
Indebtedness  or any part thereof,  regardless of whether such  encumbrances  in
favor of  Guarantor  or  Lender  presently  exist or are  hereafter  created  or
attached.  Without the prior written consent of Lender,  Guarantor shall not (i)
file suit against  Borrower or exercise or enforce any other creditor's right it
may have against Borrower, or (ii) foreclose, repossess, sequester, or otherwise
take steps or  institute  any action or  proceedings  (j)udicial  or  otherwise,
including   without   limitation  the   commencement  of,  or  joinder  in,  any
liquidation,   bankruptcy,   rearrangement,   debtor's   relief  or   insolvency
proceeding)  to  enforce  any  liens,  security  interests,  collateral  rights,
judgments or other encumbrances held by Guarantor on assets of Borrower.

         (c)  In the  event  of any  receivership,  bankruptcy,  reorganization,
rearrangement,   debtor's  relief,  or  other  insolvency  proceeding  involving
Borrower  as  debtor,  Lender  shall  have the right to prove and vote any claim
under the  Subordinated  Indebtedness and to receive directly from the receiver,
trustee or other court custodian all dividends, distributions, and payments made
in  respect  of  the  Subordinated  Indebtedness.  Lender  may  apply  any  such
dividends,  distributions,  and payments against the Guaranteed  Indebtedness in
such order and manner as Lender may determine in its sole discretion.

         (d) Guarantor agrees that all promissory  notes,  accounts  receivable,
ledgers,  records,  or any other  evidence of  Subordinated  Indebtedness  shall
contain a  specific  written  notice  thereon  that the  indebtedness  evidenced
thereby is subordinated under the terms of this Guaranty Agreement.

         10. No amendment or waiver of any provision of this Guaranty  Agreement
or consent to any  departure by the  Guarantor  therefrom  shall in any event be
effective  unless the same shall be in writing and signed by Lender.  No failure
on the part of Lender to exercise, and no delay in exercising, any right, power,
or privilege hereunder shall operate as a waiver thereof; nor

                                      - 5 -








shall any single or partial exercise of any right, power, or privilege hereunder
preclude  any other or further  exercise  thereof or the  exercise  of any other
right, power, or privilege.  The remedies herein provided are cumulative and not
exclusive of any remedies provided by law.

         11. Any acknowledgment or new promise,  whether by payment of principal
or  interest  or  otherwise  and  whether  by  Borrower  or  others   (including
Guarantor),  with respect to any of the Guaranteed  Indebtedness  shall,  if the
statute of limitations in favor of Guarantor against Lender shall have commenced
to run,  toll the running of such statute of  limitations  and, if the period of
such statute of  limitations  shall have expired,  prevent the operation of such
statute of limitations.

         12.  This  Guaranty  Agreement  is for the  benefit  of Lender  and its
successors  and assigns,  and in the event of an  assignment  of the  Guaranteed
Indebtedness,  or any part thereof,  the rights and benefits  hereunder,  to the
extent applicable to the indebtedness so assigned,  may be transferred with such
indebtedness.  This Guaranty Agreement is binding not only on Guarantor,  but on
Guarantor's successors and assigns.

         13.  Guarantor  recognizes  that Lender is relying  upon this  Guaranty
Agreement and the  undertakings of Guarantor  hereunder in making  extensions of
credit to Borrower  under the Loan  Agreement  and further  recognizes  that the
execution  and delivery of this Guaranty  Agreement is a material  inducement to
Lender in entering into the Loan Agreement.  Guarantor hereby  acknowledges that
there are no conditions to the full effectiveness of this Guaranty Agreement.

         14. This Guaranty Agreement is executed and delivered as an incident to
a lending transaction negotiated, consummated, and performable in Harris County,
Texas, and shall be governed by and construed in accordance with the laws of the
State  of  Texas.  Any  action  or  proceeding  against  Guarantor  under  or in
connection  with this Guaranty  Agreement may be brought in any state or federal
court in Harris County,  Texas.  Guarantor hereby irrevocably (i) submits to the
nonexclusive  jurisdiction of such courts,  and (ii) waives any objection it may
now or hereafter  have as to the venue of any such action or proceeding  brought
in such court or that such court is an inconvenient forum. Guarantor agrees that
service of process upon it may be made by certified or registered  mail,  return
receipt requested,  at its address specified below.  Nothing herein shall affect
the right of Lender to serve  process in any other  matter  permitted  by law or
shall  limit  the right of Lender  to bring  any  action or  proceeding  against
Guarantor  or with  respect to any of  Guarantor's  property  in courts in other
jurisdictions.  Any action or  proceeding by Guarantor  against  Lender shall be
brought only in a court located in Harris County, Texas.

         15.  Guarantor  shall pay on demand all  attorneys'  fees and all other
costs  and  expenses  incurred  by Lender in  connection  with the  preparation,
administration, enforcement, or collection of this Guaranty Agreement.


                                      - 6 -








         16. Except as expressly  provided for herein,  Guarantor  hereby waives
promptness,  diligence, notice of any default under the Guaranteed Indebtedness,
demand of payment, notice of acceptance of this Guaranty Agreement, presentment,
notice of protest, notice of dishonor, notice of intent to accelerate, notice of
acceleration,  notice of the incurring by Borrower of  additional  indebtedness,
and all other  notices and demands with respect to the  Guaranteed  Indebtedness
and this Guaranty  Agreement.  Without limiting the generality of the foregoing,
Guarantor  unconditionally waives, to the extent permitted by law, (a) notice of
any of the matters  referred to in Section 6 above, (b) all notices which may be
required by statute,  rule of law or otherwise,  now or hereafter in effect,  to
preserve intact any rights against Guarantor, including, without limitation, any
demand, presentment and protest, proof of notice of non-payment under any of the
Loan  Documents and notice of any Event of Default or any failure on the part of
Borrower,  Guarantor  or any other  guarantor of the  Obligations  to perform or
comply  with  any  covenant,  agreement,  term or  condition  of any of the Loan
Documents,  (b) any right to the  enforcement,  assertion  or  exercise  against
Borrower, Guarantor or any other guarantor of the Obligations and the Guaranteed
Indebtedness,  as applicable,  of any right or remedy conferred under any of the
Loan Documents,  (d) any requirement of diligence on the part of any Person, (e)
any  requirement  to exhaust any remedies or to mitigate  the damages  resulting
from any default  under any of the Loan  Documents,  (f) any notice of any sale,
transfer or other disposition of any right, tide or interest of Lender under any
of the Loan Documents and (g) any rights of Guarantor  pursuant to Chapter 34 of
the Texas Business and Commerce Code, as amended.

         17. The Loan Agreement,  and all of the terms thereof, are incorporated
herein by reference, the same as if stated verbatim herein, and Guarantor agrees
that  Lender  may  exercise  any and all  rights  granted  to it under  the Loan
Agreement  and the other  Loan  Documents  (as  defined  in the Loan  Agreement)
without affecting the validity or enforceability of this Guaranty Agreement.

         18. Guarantor  hereby  represents and wan-ants to Lender that Guarantor
has adequate  means to obtain from  Borrower on a continuing  basis  information
concerning the financial  condition and assets of Borrower and that Guarantor is
not relying  upon Lender to provide  (and Lender  shall have no duty to provide)
any such information to Guarantor either now or in the future.

         19. THIS GUARANTY  AGREEMENT  EMBODIES THE FINAL,  ENTIRE  AGREEMENT OF
GUARANTOR  AND LENDER WITH  RESPECT TO  GUARANTOR'S  GUARANTY OF THE  GUARANTEED
INDEBTEDNESS  AND  SUPERSEDES  ANY  AND  ALL  PRIOR   COMMITMENTS,   AGREEMENTS,
REPRESENTATIONS,  AND  UNDERSTANDINGS,  WHETHER  WRITTEN OR ORAL RELATING TO THE
SUBJECT  MATTER  HEREOF.  THIS  GUARANTY  AGREEMENT IS INTENDED BY GUARANTOR AND
LENDER  AS A  FINAL  AND  COMPLETE  EXPRESSION  OF THE  TERMS  OF  THE  GUARANTY
AGREEMENT,  AND NO COURSE OF DEALING BETWEEN  GUARANTOR AND LENDER, NO COURSE OF
PERFORMANCE, NO

                                      - 7 -








TRADE PRACTICES,  AND NO EVIDENCE OF PRIOR,  CONTEMPORANEOUS  OR SUBSEQUENT ORAL
AGREEMENTS OR  DISCUSSIONS  OR OTHER  EXTRINSIC  EVIDENCE OF ANY NATURE SHALL BE
USED TO  CONTRADICT,  VARY,  SUPPLEMENT  OR  MODIFY  ANY  TERM OF THIS  GUARANTY
AGREEMENT. THERE ARE NO ORAL AGREEMENTS BETWEEN GUARANTOR AND LENDER.


         20. THE PARTIES  AGREE TO BE BOUND BY THE TERMS AND  CONDITIONS  OF THE
CURRENT ARBITRATION PROGRAM OF LENDER, WHICH IS INCORPORATED HEREIN BY REFERENCE
AND  ACKNOWLEDGED  AS  RECEIVED  BY THE  PARTIES  PURSUANT  TO WHICH ANY AND ALL
DISPUTES SHALL BE RESOLVED BY MANDATORY BINDING  ARBITRATION UPON THE REQUEST OF
ANY PARTY.

         21. (a) All payments  payable  hereunder  in respect of the  Guaranteed
Obligations  shall be payable by  Guarantor  to  Beneficiary  in the currency in
which the  Guaranteed  Obligations  are expressed  (herein  called the "Required
Currency"). The obligation of Guarantor to make payment in the Required Currency
shall not be discharged  or satisfied by any payment or tender,  or any recovery
pursuant to any judgment or order, which is or is expressed in or converted into
any  currency  other  than the  Required  Currency,  except to the  extent  such
payment, tender or recovery shall result in the actual receipt by Beneficiary of
the full amount of the  Required  Currency  expressed  to be payable  hereunder.
Without  limiting  the  generality  of  the  foregoing,   Guarantor   authorizes
Beneficiary,  on any  payment,  tender or recovery in a currency  other than the
Required  Currency,  to  purchase  in  accordance  with its  normal  procedures,
Required  Currency  with the  amount  of such  other  currency  so  tendered  or
recovered. The obligation of Guarantor to make payments in the Required Currency
shall be enforceable  as an  alternative  or additional  cause of action for the
purpose of  recovery  in the  Required  Currency of the amount (if any) by which
such actual  receipt shall fall short of the full amount due hereunder and shall
not be  affected by judgment  being  obtained  for any other sums due under this
Guaranty.

         (b) All payments  made to  Beneficiary  hereunder  shall be made in the
Required  Currency  for value on the day on which  payment is due,  without  any
setoff or counterclaim,  free and clear of and without  deduction or withholding
for or on account of, any present or future  taxes now or  hereafter  imposed by
any  governmental  or other  authority.  As used herein,  the term "Taxes" shall
include  all  withholding,  income,  gains,  excise,  stamp and  other  taxes of
whatever nature as well as all withholding,  levies, imports, duties, charges or
fees of whatever  nature.  If  Guarantor  is  compelled  by law to make any such
deductions  or  withholdings,  it will pay  such  additional  amounts  as may be
necessary  in order that the net amount  received  and  retained by  Beneficiary
after such  deduction  or  withholdings  (including  any  required  deduction or
withholding  on such  additional  amounts)  shall equal the amount it would have
received and retained had no such deductions or withholdings been required to be
made, and it will provide Beneficiary with evidence  satisfactory to Beneficiary
that it has paid such deduction or

                                      - 8 -








withholdings.  Guarantor  hereby  agrees to  indemnify  Beneficiary  and hold it
harmless  against  all losses,  costs,  expenses  or other  amounts  incurred or
suffered by  Beneficiary  by reason of the failure of  Guarantor  to perform its
obligations under this clause (b).

         22. WITH RESPECT TO ANY AND ALL DISPUTES ARISING  HEREUNDER,  UNDER THE
NOTES,  UNDER  THE  OTHER  GUARANTEED  OBLIGATIONS,  OR UNDER  ANY OF THE  OTHER
INSTRUMENTS  AND  DOCUMENTS  EXECUTED IN  CONNECTION  HEREWITH OR THEREWITH  NOT
SETTLED  OR  SUBJECT  TO  ARBITRATION,   PURSUANT  TO  ANY  ARBITRATION  PROGRAM
REFERENCED TO HEREIN, GUARANTOR HEREBY IRREVOCABLY AND UNCONDITIONALLY:

         (a)  SUBMITS  FOR  ITSELF  AND ITS  PROPERTY  IN ANY  LEGAL  ACTION  OR
PROCEEDING  RELATING TO THIS  GUARANTY  AND ANY OTHER  DOCUMENT TO WHICH IT IS A
PARTY,  OR FOR  RECOGNITION  AND  ENFORCEMENT  OF ANY JUDGMENT IN RESPECT OF ANY
THEREOF, TO THE NON-EXCLUSIVE GENERAL JURISDICTION OF THE COURTS OF THE STATE OF
TEXAS,  THE COURTS OF THE UNITED STATES OF AMERICA FOR THE SOUTHERN  DISTRICT OF
TEXAS, AND APPELLATE COURTS FROM ANY THEREOF;

         (b) CONSENTS THAT ANY SUCH ACTION OR PROCEEDING  MAY BE BROUGHT IN SUCH
COURTS,  AND WAIVES ANY OBJECTION THAT IT MAY NOW OR HEREAFTER HAVE TO THE VENUE
OF ANY SUCH  ACTION  OR  PROCEEDING  IN ANY SUCH  COURT OR THAT  SUCH  ACTION OR
PROCEEDING WAS BROUGHT IN AN IMPROPER VENUE OR AN INCONVENIENT  COURT AND AGREES
NOT TO PLEAD OR CLAIM THE SAME;

         (c) AGREES THAT SERVICE OF PROCESS IN ANY SUCH ACTION OR PROCEEDING MAY
BE EFFECTED BY MAILING A COPY THEREOF BY  REGISTERED  OR CERTIFIED  MAIL (OR ANY
SUBSTANTIALLY  SIMILAR  FORM OF MAIL),  POSTAGE  PREPAID,  TO IT AT ITS  ADDRESS
SPECIFIED ON THE SIGNATURE PAGE HEREOF;

         (d) AGREES THAT NOTHING HEREIN SHALL AFFECT THE RIGHT TO EFFECT SERVICE
OF PROCESS IN ANY OTHER MANNER  PERMITTED BY LAW OR SHALL LIMIT THE RIGHT TO SUE
IN ANY OTHER JURISDICTION;

         (e) DESIGNATES AND APPOINTS MIKE WEBB, WHOSE ADDRESS ON THE DATE HEREOF
IS 1990 POST OAK BLVD., SUITE 1670, HOUSTON, TEXAS 77056 (HEREINAFTER CALLED THE
"PROCESS AGENT"),  AS ITS  ATTORNEY-IN-FACT  IN THE UNITED STATES OF AMERICA, TO
RECEIVE  SERVICE OF PROCESS IN ANY ACTION,  SUIT OR PROCEEDING,  IT BEING AGREED
THAT SERVICE UPON SUCH  ATTORNEY-IN-FACT  SHALL CONSTITUTE VALID SERVICE UPON IT
OR ITS SUCCESSORS AND ASSIGNS;

                                      - 9 -









         (f) AGREES THAT ITS SUBMISSION TO  JURISDICTION  AND ITS DESIGNATION OF
THE PROCESS AGENT SET FORTH ABOVE IS MADE FOR THE EXPRESS BENEFIT OF PAYEE;

         (g) AGREES  THAT A FINAL  JUDGMENT  AGAINST IT IN ANY  ACTION,  SUIT OR
PROCEEDING SHALL BE CONCLUSIVE,  AND MAY BE ENFORCED,  IN OTHER JURISDICTIONS BY
SUIT ON THE JUDGMENT OR IN ANY OTHER MANNER PROVIDED BY LAW, A CERTIFIED OR TRUE
COPY OF WHICH FINAL JUDGMENT BEING CONCLUSIVE EVIDENCE OF THE FACT AND AMOUNT OF
ANY OF ITS LIABILITY THEREIN DESCRIBED; AND

         (h) COVENANTS AND AGREES THAT SO LONG AS THIS NOTES SHALL BE UNPAID, IT
SHALL MAINTAIN A DULY APPOINTED AGENT FOR THE SERVICE OF SUMMONS AND OTHER LEGAL
PROCESS IN HOUSTON, TEXAS, U.S.A.

         23. THIS GUARANTY AND THE OTHER LOAN DOCUMENTS, AND THE INSTRUMENTS AND
DOCUMENTS  EXECUTED  IN  CONNECTION  HEREWITH,  REPRESENTS  THE FINAL  AGREEMENT
BETWEEN  THE  PARTIES  AND  MAY  NOT  BE  CONTRADICTED  BY  EVIDENCE  OF  PRIOR,
CONTEMPORANEOUS,  OR SUBSEQUENT  ORAL  AGREEMENTS  OF THE PARTIES.  THERE ARE NO
UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.



                                     - 10 -








         24.  Language.  All  notices,   communications,   evidences,   reports,
opinions,  financial  statements and other  documents given under this Guaranty,
unless  submitted in the English  language shall be accompanied by one certified
copy of an  English  translation  thereof  for  each  copy of the  foregoing  so
submitted and the English version shall govern in the event of any conflict with
the non-English version thereof.

         EXECUTED as of the 29th day of May, 1996.


                                        GUARANTOR:

                                        NORTHERN GEOPHYSICAL
                                        OF AMERICA, INC.,
                                        a Delaware corporation



                                        By:_________________________________
                                           J.D. White, Treasurer

                                        Address: 76 S. Alton Way.
                                                 Englewood, Colorado  80112
                                                 Fax No.:  (303) 290-0447
                                                 Telephone No.:  (303) 741-3700
                                                 Attention:  President


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