Multichannel Analysis of Surface Waves (MASW) at the National Geotechnical Engineering Site at Texas AM University (NGES/TAMU)

摘要

We analyzed only the portion of the NGES/TAMU data set suitable for MASW, with a sledge hammer as the source. L ateral variations in Vs are obvious from inspection of the raw data. W e selected 4 non-overla pping intervals for analysis, chosen for maximum lateral uniformity within an in terval. Analysis of the data led to four dispersion curves, which were inverted to yield 1-D Vs profiles. We present alternative profiles based on different starting models for the inversion, to illustrate the degree on non-uniqueness in the results . The new contribu tions include the analysis of the MASW data using SurfSeis©, a program that is commercially available from the Kansas Geological Surv ey, and in parallel using shareware programs from the Seismic Un*x and CPS software packages. This software is freely distributed to the scientific community by the Colorado School of Mines, and St. Louis University, respectively. Here they were combined and adapted for MASW.