Soft sediment thickness and shear-wave velocity estimation from the H/V technique up to the bedrock at meteorite impact crater site, Sao Paulo city, Brazil

To obtain shear wave velocity profile for near-surface application many geophysical techniques is used. The most recently used approach is the joint inversion of H/V spectral ratio curve and dispersion curve extracted from the multi-channel analysis of surface waves (MASW) survey. However, in some cases, it is difficult to acquired dispersion curve in engineering application frequency range 1–30Hz. In that situation, dispersion curve can be indirectly inverted from all the available points of the frequency-VRayleigh curve to shear wave velocity and depth. This result a series of (s-wave velocity and depth) values through which a best-fit trend can be passed. The best fit gives us an idea of the rate of shear wave velocity increase with depth and shear wave velocity at one-meter depth. This information can later be utilized in an inversion of Rayleigh wave ellipticity curve.