2-D Shear-Wave Velocity Profile Along Test Segment of Interstate I-70, St. Louis, Missouri

Multi-channel surface-wave (MASW) seismic control was acquired along a 6400 ft segment of interstate I-70 in downtown St. Louis, Misouri. The acquired MASW data set (consisting of Rayleigh waves) was transformed into a 2-D MASW shear-wave velocity profile with a trace-spacing of 40 ft. Shear-wave velocity control extends from the surface to depths on the order of 100 ft. The interpreted depth to acoustic bedrock along the 2-D MASW profile varies between 20 ft and 44 ft. The interpreted 2-D MASW shear-wave velocity profile was compared to available borehole, cone penetrometer and seismic cone penetrometer control provided by the Missouri Department of Transportation. The 2-D MASW profile correlates very well with availablegeotechnical control, supporting the conclusion that the multi-channel surface-wave seismictechnique can be used to generate reliable and interpretable 2-D shear-wave velocity profiles of the shallow subsurface.