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What remains after subtraction of theoretical gravity are gravity anomalies with the effects of station elevation and 'normal mass' topographic masses removed. These anomalies must therefore be related to anomalous density structure - relative to normal ellipsoidal Earth model.

- #3

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Yes, just so long as you do it to all your gravity readings and also make the other necessary corrections (i.e. for instrument drift, and latitude). You should do this in almost all circumstances, provided that it is a density anomaly that you are looking to detect.

The free air anomaly corrects your reading to a datum elevation, this elevation is arbitrary but is usually taken to be a surface of gravitational equipotential known as the

The Bouguer correction attempts to correct for the excess mass that exists between your gravity station and the datum. This is achieved via the simplifying assumption that the topography can be represented by a flat plate extending to infinity in all directions. Mathematically, the correction is 2*pi*density*G*h, where G is the gravitational constant = 6.67*10

In areas of high relief, where the Bouguer plate will not suffice to approximate topography, a more rigorous approach to correcting for topography is necessary, these computations are tedious and must be carried out by a computer.

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