| The gravity station data (6,591 records) were compiled by the U. S. Geological Survey.
This data base was received on February 23, 1993. Principal gravity parameters include
observed gravity, Free-air anomalies and Bouguer anomalies. The observed gravity values
are referenced to the International Gravity Standardization Net 1971 (IGSN 71). The
gravity anomaly computation uses the Geodetic Reference System 1967 (GRS 67) theoretical
gravity formula. |