EVALUATION OF AMBIENT SEISMIC NOISE FOR RISK MITIGATION IN MANZANILLO
This study presents a detailed reanalysis of ambient seismic noise data from the urban area of the Port of Manzanillo, Colima, Mexico, using a database of 100 measurement points collected through broadband triaxial seismographs. The objective is to enhance the characterization of local soil conditions and assess seismic and tsunami risks in the region. Parameters such as the average shear wave velocity in the upper 30 meters (Vs30) and peak ground acceleration (PGA) are employed to evaluate soil conditions and their influence on the amplification of seismic waves.
The study primarily focuses on the application of the horizontal-to-vertical spectral ratio (HVSR) method and its directional variant, D-HVSR. This approach allows for the identification of azimuthal resonance differences, providing a more detailed assessment of the complexity of soil-structure interaction. The D-HVSR results reveal significant variations in resonance amplitudes across different directions, suggesting the presence of lateral heterogeneities and complex subsurface structures. These characteristics are critical for identifying areas with a high potential for amplification of seismic waves and tsunami impact.