Gravity Method, Surface

Abstract

Gravity method. Geophysical method based on measuring the variations in the earth’s gravity field. Gravity stations. Locations, where gravity measurements are made. Base gravity stations. Locations, where absolute value of the earth’s gravity field is known. Primary base. Gravity observation stations, which are made on stable platform and absolute value of the gravity field is known to a greater accuracy. Secondary bases. Temporary bases established for a particular survey. Closed loop. Bases that are connected in a loop for base loop correction. Drift correction. Correction applied for nontidal variation of gravity, which is mainly dependent on the behavior of gravitymeters with time. EOTVOS correction. Correction applied to marine gravity data for the movement of ship. mGal; 1 mGal = 10−5 m/s2 μGal; 1 μGal = 10−8 m/s2