Thickness and shear wawe velocity measurement of sediment package at meteorite impact crater site of Colonia, São Paulo City, Brazil

To obtain shear wave velocity profile for near-surface application many geophysical technique are used. The most recently used approach is the joint inversion of H/V spectral ratio curve and dispersion curve extracted from multi channel analysis of surface waves (MASW) survey. However in some cases its difficult to acquired dispersion curve in engineering application frequency range 1-30 Hz. In those situation dispersion curve can be indirectly inverted from all the available points of frequencyVRayleigh 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 give us an idea of rate of shear wave velocity increase with depth and shear wave velocity at one meter depth. This information can later be utilized in inversion of Rayleigh wave ellipticity curve. ___________________________