Cintrón-Aponte, Rommel

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    Determinación de periodos fundamentales del suelo mediante vibraciones ambientales en el Municipio de Humacao, Puerto Rico
    (2014-05) Cintrón-Aponte, Rommel; Suárez, Luis E.; College of Engineering; Martínez Cruzado, José A.; Ramos Cabeza, Ricardo; Huerta, Carlos I.; Department of Civil Engineering; Santana, Alberto
    The Nakamura’s technique has been used worldwide to determine site fundamental periods. The technique is to calculate and plot H/V spectral ratios from ambient vibrations recorded over the ground. Ambient vibration measurements were taken at 151 sites within the municipality of Humacao, eastern Puerto Rico. The records were processed using both Fourier spectra and power spectra. The technique was validated by comparing with the results of H/V spectral ratios from weak seismic events and also with numerical modeling performed with downhole test data. The H/V spectral ratio plots were divided into cases and groups, which depend on the ease of identifying the peak fundamental period and amplitudes at frequencies below 1 Hz, respectively. The results obtained with both spectra were compared and it is concluded that they complement each other to provide more reliable results. Maps were created displaying site fundamental periods, amplitude factors, isoperiods and seismic classification. Isoperiods maps were performed in the most populated zones over soil deposits. The map of soil fundamental periods showed good correlation with local geology. The seismic site classification map derived from site periods was compared with the site classification map derived from geotechnical test borings. The seismic classification map obtained from soil periods may overestimate slightly some site classifications. However, this map can provide a rough estimate of the subsurface average shear wave velocity to a depth of 100 feet (30 meters).