lamont-doherty geological observatory 

 columbia university 



DALlSAOeS. NEW YORK 10964 



TALWAnI 2-D gravity language - FORTRAN IV-H 



COMPUTER - IBM 360/65 

 (COPY ON FILE AT NODC) 



CALCULATES THE VERTICAL COMPONENT OF GRAVITATIONAL ATTRACTION OF TWO- 

 DIMENSIONAL BODIES OF ARBITRARY SHAPE BY APPROXIMATING THEM TO MANY- 

 SIDED POLYGONS. THE TECHNIQUE IS FROM TAlWANI, WORZEL. AND lAnDISMAN 

 IN JGRt VOL. 6^* NO. 1. 1959. OUTPUT — THE GRAVITY VALUES ARE PRINTED 

 IN TABLES. AND THE CALCULATED PROFILE AnD THE OBSERVED PROFILE IF ONE 

 EXISTS ARE PLOTTED ON THE LINE PRINTER IN EITHER A PAGE SIZE PLOT OR 

 An EXTENDED PLOT WITH THE X-AXIS RUNNING DOWN THE PAGE. PROGRAM CON- 

 TAINS OPTION OF UNITS IN MIlES, KILOFEET, OR KILOMETERS. THE PROGRAM 



no. is w9206 (may, 1968). 



u. s. geological survey 

 computer center division 

 attn. ralph eicher. chief 

 branch of scientific applications 

 washington. d. c. 20242 



profile card-to-tape for geopac language - fortran iv-h 



computer - ibm 360/65 

 •copy on file at nodc) 

 used to put data. usually profile data. punched on cards onto magnetic 

 Tape for subsequent processing by other programs in a package of pro- 

 grams FOR TWO-DIMENSIONAL GRAVITY AND MAGNETIC CALCULATIONS. OPTIONS 

 IN THE PROGRAM ALLOW FOR THE PRELIMINARY OPERATIONS OF SCALING, SHIFT- 

 ING, OR DETREnDING THE DATA. PRqFIlEs MAY AlSO BE CONCATENATED TO 



Combine several data sets as one. program no. w9325, by ralph eicher. 



U. S. geological SURVEY 

 COMPUTER CENTER DIVISION 

 ATTN. RALPH EICHER, CHIEF 

 BRANCH OF SCIENTIFIC APPLICATIONS 

 WASHINGTON, D. C. 20242 



2D MAGNETIC ANOMALIES LANGUAGE - FORTRAN 



COMPUTER - IBM 1800 SYS 



COMPUTES HORIZONTAL AND VERTICAL AND TOTAl MAGNETIC ANOMALIES ARISING 

 FROM PRISMS OF ARBITRARY CROSS-SECTION AND MAGNETISATION AND InFInITE 

 In LENGTH. A VERSION FOR THE ATLAS I IS ALSO IN FORTRAN. N.I.O. PRO- 

 GRAM 102, BY E. PAlETHORPE AND J. CREASE. REF. N.I.O. INTERNAL REPORT 

 NO. N.IO, NOV 1968. 



NATIONAL INSTITUTE OF OCEANOGRAPHY 

 WORMLEY, GODALMING, SURREY 

 ENGLAND 



COMPUTATION AND PLOTTING OF MAGNETIC ANOMALIES LANGUAGE - FORTRAN II 

 AND GRADIENTS COMPUTER - IBM 7094 W/ 



CAlCOMP 

 (COPY ON FILE AT NODC) 



COMPUTES THE ANOMALY PROFILES FOR TOTAL FIELD, HORIZONTAL AND VERTICAL 

 COMPONENTS, FIRST AND SECOND VERTICAL DERIVATIVES AND FIRST AND SECOND 

 HORIZONTAL DERIVATIVES OVER A UNIFORMLY MAGNETIZED TWO-D I MENS I ONAL 

 POLYGON OF IRREGULAR CROSS-SECTION. OUTPUT MAY BE PRINTED OR PLOTTED. 

 REF. iPOTENTIAL APPLICATIONS OF MAGNETIC GRADIENTS TO MARINE GEOPHYS- 

 ICS' BY WILLIAM E. BYRD, JR., JUNE 1967. PROGRAM MODIFIED AND EXPAND- 

 ED FROM TALWANI AND HEIRTZLER (1964). 



DEPARTMENT OF GEOLOGY AND GEOPHYSICS 



PAGE 026 



