DETERMINACIóN DEL PARáMETRO VS30 USANDO LOS MéTODOS FK Y SPAC EN LA BAHíA DE CáDIZ (SUR DE ESPAÑA)

Abstract

In April 2008 an ambient vibration measurement campaign was conducted in Cadiz Bay (South of Spain). H/V and arrays techniques were applied in order to classify the soil types at different sites according to Vs30 parameter in six nearby towns: Cadiz, Chiclana, Rota, Puerto Real, San Fernando and El Puerto de Santa María. The H/V technique confirmed that in towns of Cadiz, Chiclana and El Puerto de Santa María, the medium is heterogeneous and with horizontal layering which allows us to observe the dispersion phenomena. In Puerto Real the soil profile looks like horizontal but homogeneous and in Rota an San Fernando the soil profile changes in a short distance, according to the differences observed in the H/V obtained in two sites 50 m apart. The array technique showed clear definition of dispersion curve and well defined soil profile (models with less error) in Cádiz, Chiclana and El Puerto de Santa María but not conclusive results for Rota and San Fernando, due to unclear dispersion curves obtained. In general, the soil types that predominate in the area can be classified as B and C according to Eurocode 8, based on the values of Vs30 obtained using arrays technique.