How to utilize GPR data to classify soil stiffness or strength?

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Doug Crice

GPR responds to conductivity, not soil stiffness or strength. Use MASW, which plots in-situ shear wave velocities which are related to shear strength. Go to MASW.com for a tutorial.

Otavio Coaracy Brasil Gandolfo

Agreeding with Doug, use seismic methods to evaluate soil stiffness or strength. MASW, or crosshole/downhole tests (if boreholes available).