RAYLEIGH-WAVE DISPERSION CURVES FOR LONG, LINEAR ARRAYSAT A PREDOMINANTLY-GRAVEL SITE

摘要

Experimental Rayleigh-type surface wave dispersion curves were developed for a gravel site over limestone bedrock. The work was performed as part of an earthquake site-response study. The SASW, MASW, and ReMi methods were applied in linear arrays that approached 1 km in length. For the SASW method, a Vibroseis source was used. The other methods used primarily ambient noise. Dispersion curves were resolved to a minimum frequency of 1 Hz, which corresponded to a maximum wavelength of well over 1 km. Dispersion curves from the three methods' were iri good agreement over a broad frequency band but'differed at low and high extremes. The ambient noise at the site did not appear to introduce directional bias in the passive-source survey results.