<TABLE> <S> <C>
<ARTICLE> 5
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-END> SEP-30-2000
<CASH> 2,530
<SECURITIES> 0
<RECEIVABLES> 60,735
<ALLOWANCES> 1,137
<INVENTORY> 0
<CURRENT-ASSETS> 0<F1>
<PP&E> 210,809<F2>
<DEPRECIATION> 68,271
<TOTAL-ASSETS> 553,175
<CURRENT-LIABILITIES> 0<F1>
<BONDS> 215,675
0
0
<COMMON> 244
<OTHER-SE> 259,950
<TOTAL-LIABILITY-AND-EQUITY> 553,175
<SALES> 44,827
<TOTAL-REVENUES> 44,827
<CGS> 1,072
<TOTAL-COSTS> 1,072
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 3,018
<INCOME-PRETAX> 11,126
<INCOME-TAX> 3,894
<INCOME-CONTINUING> 7,232
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 7,232
<EPS-BASIC> .30
<EPS-DILUTED> .30
<FN>
<F1> The Company does not present a classified balance sheet; therefore, current
assets and current liabilities are not reflected in the Company's financial
statements.
<F2> PP&E does not include seismic data bank assets with a cost of $684,084,000
and related accumulated amortization of $342,588,000.
</FN>
</TABLE>