International Comparisons of Absolute Gravimeters - Their Relevance for Vertical Displacement Monitoring
J E. Faller
Insrument capabilities have evolved over the past 40 or so years to the point where, today, both relative and absolute measurements can nowbe made. at the parts in 109 level of precision. Since a vertical height change of I cm produces a gravity change of 2 Gals, today'smeasurement precision provides (corresponds to) a vertical height sensitivity of approximately 1 cm. Furthermore, since this is the level at which movements on time scales of the order of a year are actually occurring, gravity today provides a potentially useful tool for studying these slow vertical motions.