GEOP2 - Gravity Anomalies - deviations from expected value...

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Gravity Anomalies - deviations from expected value g t = g Ref = g e 1 + 5.278895 ! 10 " 3 sin 2 #" 2.3462 ! 10 " 5 sin 4 # ( ) m/s 2 If there were no topography (i.e. on the reference elllipsoid) gravity is given by the reference (or theoretical) value for that latitude Actual measured gravity, g obs , will be different from this value, some of which will be due to topography. Anomalies are the values left over after some expected part of the gravitational field is subtracted from the observed value: ! g = g obs " expected value Expected value includes g t and corrections for the effect of elevation above (or below) the reference ellipsoid.
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Topography has two effects on gravity field a) Farther from Earth’s center (reduces gravity) b) More material underneath (increases gravity) Free-Air Correction (FAC) adjusts for (a) Bouguer Correction (BC) adjusts for (b) r R E h
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r R E h Free air correction - assumes you are floating in space FAC=elevation x (rate of change of g with elevation)
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This note was uploaded on 11/22/2010 for the course GEOP 341 taught by Professor Sparks during the Spring '10 term at Texas A&M.

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GEOP2 - Gravity Anomalies - deviations from expected value...

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