Full Waveform Reflectivity For Inversion Of Surface Wave Dispersion In Shallow Site Investigations

Abstract

Dominant higher modes of surface waves are generated in sites with large stiffness contrasts<br>and/or reversals between layers. A multichannel simulation employing full-waveform reflectivity<br>properly models dispersion curve discontinuities and allows inversion for shear velocity structure. A<br>fundamental mode assumption causes low-velocity layers to be undetected and high-velocity layers to<br>be interpreted both too deep and thick. Dominant higher modes are observed and inverted at a mine site<br>over weathered sandstone and a compacted waste dump. Stacking dispersion curves provides a more<br>unique dispersion for inversion.