Seismic site classification of the Costa Rican Strong-Motion Network based on VS30 measurements and site fundamental period

In this paper, a new seismic site classification for the Costa Rican Strong-Motion Network (CRSMN) is proposed. The soil profile of Seismic Code based on average shear-wave velocity top 30 m (VS30) used as reference. fundamental period (Tf) included parameter to complement existing characterization. For this, VS30 measurements from 52 accelerometric stations are related obtained through horizontal-to-vertical spectral ratios (HVSR) using ground motion records Database. H/V estimated with 5% damped acceleration response spectra and traditional Fourier amplitude S-wave window. From relation between Tf, different ranges Tf assigned graph three-lines four-areas proposed classify CRSMN.