Pyramid Geophysical Services

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Seismic (MASW) Surveys to Investigate Top of Rock

MASW top of rock

One of the most common applications of near-surface seismic testing is to identify the depth of the top of a bedrock unit in the subsurface. The two most effective seismic methods associated with this application are: 1) Seismic refraction, and 2) Multi-Channel Analysis of Surface Waves (MASW). Most people who are … [Read more...]

Filed Under: Case Studies Tagged With: geophysics, MASW, north carolina geophysics, seismic, shear wave, top of rock

Slope Stability Analysis Using Geophysics

void under road

Pyramid Geophysical Services was contracted to assist in a comprehensive evaluation of subsurface geologic and hydrogeologic conditions along a causeway in South Carolina. The causeway was experiencing slope failures and ground collapses. These failures were thought to be the result of both the presence of buried … [Read more...]

Filed Under: Case Studies Tagged With: electrical resistivity, electromagnetic, GPR, ground collapse, MASW, seismic, slope geophysics, slope stability analysis, voids

Seismic Refraction

seismic refraction profile

Pyramid Geophysical Services was contracted to perform seismic refraction survey along a proposed trail in North Carolina. The seismic refraction method consists of measuring (at known points along the surface of the ground) the travel times of compression waves (P-waves) generated by an impulsive energy source. In … [Read more...]

Filed Under: Case Studies Tagged With: bedrock investigation, north carolina geophysics, refraction, seismic, Seismic Refraction

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