technology (INS) have made shipborne gravity surveys more reliable, and led to a complete revival of airborne gravimetric surveys in the early 1990s.

Gravity surveys are used either alone or in combination with magnetotelluric, magnetic, and induced polarization and resistivity surveys to determine the location and size of the major source structures containing accumulations of hydrocarbons, massive base metal deposits, iron ore, salt domes, and hydrogeological aquifers. as the standard unit of measure (named after Galileo). It explains what gravity measurements can tell us about the subsurface, how a gravity survey is done and how the data are processed.

It does not …

Students should read it before the Edinburgh/Paris Sud/Munster geophysics eld course. Gravity surveys use the milligal or mgal (=0.0001 gal.) It is useful to remember that 1 mGal is just a bit more than 1 millionth of g n (1.01972 x 10-6 g n). Standard gravity is therefore 980.665 Gal or 980665 mGal. Gravity surveying: a brief introduction Hugh C. Pumphrey September 24, 2014 Abstract This is an introduction to gravity surveying for absolute beginners.

The acceleration for one gal is equal to 1 cm per second per second. The acceleration for one gal is equal to 1 cm per second per second. Observed Gravity (g obs) - Gravity readings observed at each gravity station after corrections have been applied for instrument drift and earth tides.

Moreover, satellite altimetry strongly benefited from spaceborne GPS.