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ARM Geophysics Borehole / Wireline Logging Borehole Geoscience StructureScan GPR EM-61 EM-31 Seismic Reflection Seismic Refraction MASW Electrical Resistivity Imaging Microgravity Geoprobe Drilling Services
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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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Seismic Refraction Surveying
High-Resolution Geophysical Technologies

ARM Geophysics uses seismic refraction methods to determine bedrock depth and rippability as well as to delineate fractures.

The earth is made up of various materials that have specific physical properties. One of the properties is the rate at which compressional energy travels through the ground. This energy is generated by a sledge hammer hitting against a metal plate on the ground, massive weights thrown against the ground, or even by explosives. As the energy travels through the subsurface, it will reflect and refract at the interface between different subsurface layers.


Seismic refraction survey in Dalton, Georgia.


Seismic refraction layer model.

Applications:

  • Top of Bedrock
  • Water Table Depth
  • Rippability
  • Fracture Delineation

A seismograph measures the travel time from the source to a set of sensors or geophones which are at a known distance from the source. Given the travel time and the distance, a seismic layer model can be obtained.

 

 Seismic velocity map showing areas of less competent bedrock.

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