## Computer calculation of two-dimensional gravity fields |

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### Contents

Contents | 1 |

Fortran IV program GRAV2D | 7 |

Generalized flow diagram of Fortran program GRAV2D | 14 |

### Common terms and phrases

0F FILE 40 km region 50-cent mailing fee algorithm APPENDIX BLAKELY Bloomington BODY DENSITY BODY VERTICES CALCULATION OF TWO-DIMENSIONAL Computer Calculation COUNTRY ROCK DEPARTMENT OF NATURAL depth developed by Talwani END 0F END OF FILE Equation 12 ﬁeld field points Fields By ALBERT FILE WHILE READING FORMAT FORMAT(1H Fortran Program GRAV2D Geological Assistant GEOLOGICAL SURVEY OCCASIONAL Geologist and Head Geophysical Computer Program Geophysicist Geophysics Section gm/cma gravity effects Hubbert Indiana Geological Survey Indiana University infinite horizontal extent Input Cards INPUT PARAMETERS line integral LINE PRINTER line segment line-integral method List and Plot mailing fee third MAX(MGAL MIN(MGAL OCCASIONAL PAPER 40 octagons output Paleontologist Paper 13 parallelogram POINT BY POINT PRINT AND PLOT read in point RHOC ROBERT F RUDMAN and ROBERT SCALE(MGAL/INCH Second line Seismograms solid angle subroutine LNNTGR SURFACE POINTS SURVEY OCCASIONAL PAPER SXDIFF SXMIN tanoi test case demonstrates thousands of feet TWO-DIMENSIONAL GRAVITY FIELDS zero elevation