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ARM Geophysics
1129 West Governor Road
P.O. Box 797
Hershey, PA 17033-0797

Scott Wendling, PG
Phone: 717-508-0583
[email protected]

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Microgravity Surveying
Geophysical & Non-Destructive Technologies

Microgravity surveying (Gravity) is a valuable tool to characterize subsurface karst features. It can be utilized in urban areas where cultural features and noise limit other techniques like seismic and resistivity. Gravity can map and identify preferential flow paths associated with fractures zones and large cavity systems. It can also be used for the identification and characterization of potential collapse features due to karst sinkhole activity or mine subsidence. Most potential collapse features have no recognizable surface morphology until there is a catastrophic failure and a collapse occurs. Since air filled voids have sufficient lateral density contrasts from surrounding bedrock and soils, microgravity can be a rapid and inexpensive means of identifying potential collapse features.

Applications:

  • Karst related cavities and solution channels
  • Void Identification
  • Sinkhole Delineation
  • Mine Subsidence Mapping
  • Buried Valley Identification

Microgravity surveys are used to identify lateral variations in the subsurface soil and rock density, which are influenced substantially by the size and depth of the target. The infield gravity, elevation, and time data are processed and a Bouger Gravity Anomaly map is produced. This map shows local relative gravity lows, which indicate areas of less dense materials (e.g., potentials voids, sinkhole throats) located under the survey area.

 

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