L03_GravCorrAnalysis-page2

L03_GravCorrAnalysis-page2 - Free-air correction h C F 086...

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Applied Geophysics – Corrections and analysis Latitude correction ) 2 sin 0000059 . 0 sin 0053024 . 0 1 ( 780318 . 9 2 2 φ + = g …correct for the spheroid Geodetic Reference System (GRS-1967) formula 2 sin 12 . 8 = C m/s 2 For smaller scale studies we can simplify: g.u./km-N-S Correction is greatest at mid-latitudes. For 0.1 g.u. accuracy need relative N-S distance to 12 m Add or subtract? Applied Geophysics – Corrections and analysis
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Unformatted text preview: Free-air correction h C F 086 . 3 = 2 E E R GM g = Accounts for the 1/r 2 decrease in gravity with distance from the center of the Earth, recall: We calculate: For 0.1 g.u. accuracy stations elevation is needed to 4 cm. Add or subtract? where h is the elevation in meters...
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