Gravimetry

The gravimetric technique is based on measuring localized variations in the earth’s gravitational field, which are caused by the presence of materials of different densities or voids in subsurface. The presences of an anomalously high (or low) density body in subsurface causes a localized high (or low) anomaly in the measured gravitational field. These gravitational anomalies are extremely small; however, modern instrumentation and exhaustive data processing techniques have made it possible to detect both geological and artificial structures. ZAP Consulting Engineers has applied this method in the following applications:

• Detection of sub-surface voids (i.e. caves, graves and mine openings),
• Detection of buried structures (i.e. foundations and storage tanks),
• Mapping of bedrock lithology,
• Mineral exploration.