Gravity is the property of matter that causes it to attract or pull other matter. A gravity meter works on that simple principle where it measures the changes in pull on a small mass attached to the end of a lever from the matter surrounding it. The amount of pull on that small mass depends on both the size and density of the bodies around the meter as well as the distance of those bodies from the meter.

Excel owns and operates Model-G LaCoste and Romberg gravity meters, Model-U LaCoste and Romberg remote-reading underwater/ long-line gravity meters and ZLS micro-Gal Burris meters. Gravity and micro-gravity surveys are made up of gravity measurements made at discrete points with the resulting anomalies being directly related to lateral variations in subsurface density.


  • Characterizing geologic structures
  • Delineating buried valleys and bedrock topography
  • Mapping erosion features
  • Highly effective tool in identifying caves, voids, sinkholes, weathered zones and man-made structures such as mines and tunnels.


  • Low- cost compared to seismic programs
  • Highly accurate
  • Non-intrusive
  • Not susceptible to cultural noise (measurements can be taken indoors)
  • Data can be interpreted to provide estimates of depth, size, and nature of the anomalies