Anticlinal: A fold sloping downward on both sides from a common crest

Homogenous: The same or similar material throughout. Uniform in structure or composition.

Amplitude:   Half the orthogonal distance between the antiformal and synformal enveloping surfaces.

Station:   Location on a survey line or a survey grid where a measurement is made.

Earth Tide Correction:   Cyclic variation in gravity measurements during the course of the day caused by changes in the relative positions of the earth, moon, and sun.

Drift:  The gradual change in gravimeter readings with time caused by various factors, including temperature and tidal effects.  A correction is made by re-occupying a base station at the end of the day to measure the change which has occurred since the beginning of the day.