MICROTREMOR ARRAY MEASUREMENTS FOR SITE EFFECT INVESTIGATIONS: COMPARISON OF ANALYSIS METHODS FOR FIELD DATA CROSSCHECKED BY SIMULATED WAVEFIELDS

摘要

Within the scope of the SESAME project we have assessed the reliability of array techniques applied to ambient vibrations for site effect investigation. In particular, we estimated the dispersion characteristics for the Rayleigh wave part of ambient vibrations recorded in the Lower Rhine Embayment (NW Germany). In order to eliminate ambiguities related to the interpretation of the estimated phase velocities, we crosschecked our results with simulated microtremor wavefields. The inversion of the observed dispersion curves shows that there is a good agreement with the known shear wave velocity profiles of the subsurface.