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ELECTRICAL RESISTANCE TOMOGRAPHY
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Gravity Gravity measurements are used to detect anomalies produced by density variations in the subsurface materials. Gravity surveys can detect subtle changes in the earth's gravitational field to locate features in bedrock such as sinkholes, faults, and buried valleys. Microgravity surveys can be used to map the horizontal and vertical extent of landfills. Microgravity can also be used to locate water-bearing caverns and pinnacles in Karst terrain that represent the major groundwater flow paths. Microgravity is not influenced by anthropogenic interference such as buildings or underground utilities. Data are corrected for gravity meter drift, solar and lunar tides, latitude, elevation, and local terrain.
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