On October 23rd, 2014, we updated our
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The use of acceleration due to gravity to
study the subsurface it is required to
remove any unwanted effects, so that the
effects from anomalous bodies are the
• Sea level can be regarded as equipotential
•Earth’s surface possesses undulations.
•Areas above sea level have less g
•Areas below sea level have greater g
Thus elevations of the earth’s surface affects g
and this effect should be removed.