Gravity methods measure the change in the earth’s gravitational field at a specific location. Gravity meters use a sensitive balance to measure variations in the force of gravity at the surface caused by variations in the density of the subsurface. They are used to detect and map buried structures with contrasting density. Theoretical models can be used to approximate size, depth, shape, and make up of objects creating anomalies. The data acquisition relatively simple but requires a series of complex data corrections requiring a high level or precision. Collier utilizes gravity methods on a variety of applications.
Typical Applications of Magnetic Methods
- Karst features
- Voids and tunnels
- Bedrock valleys and paleo channels
- Faults and other geologic structure
- Oil and Gas exploration
- Absolute gravity measurements