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Obras y proyectos

versión On-line ISSN 0718-2813


FERNANDEZ, José; PASTEN, César; RUIZ, Sergio  y  LEYTON, Felipe. Study of site effects in the Coquimbo Region due to the 2015 Mw 8.3 Illapel, Chile, Earthquake. Obras y Proyectos [online]. 2017, n.21, pp.20-28. ISSN 0718-2813.

This work aims to determine site effects in the Coquimbo Region due to the 2015 Mw 8.3 Illapel earthquake, particularly in towns with seismological stations. In addition, it seeks to relate the seismic response and the distribution of damage during the event with the geomorphology and geology of the sites. This study used H/V spectral ratios (HVSR) applied to acceleration records of moderate to high magnitude earthquakes (Mw 5) occurred in a time window of three years around the main event. Moreover, the HVSR method was also applied to seismic ambient vibration records (20 to 30 minutes long), recorded by 4.5 Hz seismographs. Both variations ofthe method generated spectral ratios as a function of the period, allowing the dynamic characterization of the soil deposits through their predominant vibration period. This information is complemented with the geology and geomorphology of the studied zones in order to explain the site effects in each one. Finally, the results are compared with calculated MSK intensities from a survey of housing damage caused by the earthquake, implemented by government institutions. Our analyses conclude that the seismological stations of the Coquimbo Region are mostly over rigid soil deposits and rock outcrops, which is consistent with the MSK intensities that reached maximum values of 6.5 in the Region.

Palabras clave : site effects; HV spectral ratios; MSK intensities.

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