Measuring and testing – Gravitational determination
Patent
1992-02-11
1993-06-08
Williams, Hezron E.
Measuring and testing
Gravitational determination
G01V 702
Patent
active
052169200
ABSTRACT:
Shipboard gravity data are currently recorded with one shipboard gravity meter. Gravity data are tied to the international gravity datum when the boat docks about every 30 days. The accuracy of these data is about 0.5 milligals and not sufficiently accurate for detailed quantitative interpretation. It is possible to increase the accuracy of shipboard gravity data twofold by using the procedure we have described. A stable boat with precision navigation and water depth soundings is necessary. Two gravity meters are calibrated to read the same values and times. These are placed near the center of the boat with one meter facing forward and one facing backward for plus and minus cross coupling, or simultaneous accelerations in different directions. Integration of the gravity recordings cancels random noise. This innovation increases the accuracy to 0.35 milligals. Shipboard gravity data are tied to a coarser grid of still gravity readings tied to the international gravity datum at land locations. The boat is stopped and still gravity readings are recorded at sea, forming the coarse grid of data. The still readings are recorded in loops combined with continuous base gravity recordings on land for diurnal control. The accuracy of the still gravity values is about 0.15 milligals. The shipboard gravity data are tied to the still gravity data grid at time intervals of 30 minutes versus the normal 30 days. The resulting gravity data are accurate to about 0.25 milligals and adequate for detailed studies.
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Brock Michael
Williams Hezron E.
LandOfFree
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