Empirical site classification of seismological stations in Chile using horizontal-to-vertical spectral ratios determined from recordings of large subduction-zone earthquakes
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Date
2019
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Abstract
Despite the significant upgrade and expansion of the seismic monitoring network in Chile over
the past several years, precise site characterization of a large number of seismological
stations is still lacking, thus hindering a robust development of tools that could improve
prediction of regional seismic hazard. To enhance our understanding of site effects in Chilean
seismological data, this study classifies 136 stations using the horizontal-to-vertical spectral
ratio (HVSR) method based on a database of 283 triaxial ground-motion records from 22
subduction interface earthquakes with moment magnitudes ranging from 6.8 to 8.8 that
occurred between 1985 and 2015. This classification, which is based on the SESAME
guidelines, divides recording stations into four types according to the shape of the
station-average HVSR curve (single-peak, double-peak, broad/multiple-peak, and flat).
Furthermore, the variability of the mean HVSRs with different source, path and site
parameters is investigated. The derived HVSR results are also compared with those
presented in previous HVSR studies for Chile. Finally, representative shear-wave velocity
profiles along with parametric uncertainties are estimated for stations with a single-peak
HVSR curve using a Bayesian statistical inversion framework.
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Yang, S., Mavroeidis, G., de la Llera, J., Poulos, A., Aguirre, P., Rahpeyma, S., Sonnemann, T., & Halldorsson, B. (2019). Empirical site classification of seismological stations in Chile using horizontal-to-vertical spectral ratios determined from recordings of large subduction-zone earthquakes. Soil Dynamics and Earthquake Engineering, 125, 105678. https://doi.org/10.1016/j.soildyn.2019.05.017