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Interrogating levees using seismic methods in southern Texas

The primary objective of this work was to determine compressional and shear velocity distribution within the body of five levees and any relationship to existing core and airborne EM data. Several different types of seismic data were recorded at each of the five different levee sites, each site possessing unique core and/or EM characteristics. Several seismic data analysis techniques were appraised including, P- and S-wave refraction, P- and S-wave refraction tomography, Rayleigh and Love-wave surface-wave analysis using multi-channel analysis of surface waves (MASW), and P- and S-wave cross-levee tomography. While the P-wave methods provided reasonable results, the S-wave methods produced surprising Vs properties. The reason for the latter effect is not clear; possibly the result of mode conversion, which is likely at sites with Poisson’s ratio greater than 0.438. Alternatively, these could be real and related to mechanical compaction and material