Introductory Geophysics course, Reduction of Gravity data

1. By : Dr Amin Khalil

2. Gravity field depends on :
 Mass
 Inverse of squared distance

3. Earth’s Radii

4. 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
only factors.

5. • Sea level can be regarded as equipotential
surface.
•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.

6. Increase in mass
result is increase in g