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Seismic site classification of the Costa Rican Strong-Motion Network based on VS30 measurements and site fundamental period
Clasificación de sitio de la Red de Acelerógrafos de Costa Rica basada en mediciones de VS30 y en el período fundamental
DOI:
https://doi.org/10.15446/esrj.v25n4.93927Keywords:
Site classification, Site fundamental period, Shear-wave velocity, Costa Rica, HVSR, Vs30 (en)Clasificación de sitio; período fundamental de sitio; velocidad promedio de la onda de corte; Costa Rica; relaciones horizontales/verticales; Vs30 (es)
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In this paper, a new seismic site classification for the Costa Rican Strong-Motion Network (CRSMN) is proposed. The soil profile classification of the Costa Rican Seismic Code based on the average shear-wave velocity of the top 30 m (VS30) is used as a reference. The site fundamental period (Tf) is included as a parameter to complement the existing characterization. For this, the VS30 measurements from 52 accelerometric stations are related to the site fundamental period obtained through horizontal-to-vertical spectral ratios (HVSR) using ground motion records from the Costa Rican Strong-Motion Database. The H/V ratios are estimated with 5% damped acceleration response spectra and with traditional Fourier amplitude spectra from the S-wave window. From the relation between VS30 and Tf, different ranges of Tf are assigned to the existing soil profile classification and a graph with three-lines and four-areas is proposed to classify the stations of the CRSMN.
En este artículo, se propone una nueva clasificación de sitio para la Red de Acelerógrafos de Costa Rica (RACR). Se utiliza como referencia la clasificación de sitio del Código Sísmico de Costa Rica basada en la velocidad promedio de la onda de corte de los 30 m superiores (VS30). El período fundamental del sitio (Tf) se incluye como parámetro para complementar la caracterización existente. Para ello, las mediciones de VS30 de 52 estaciones acelerométricas se relacionan con el período fundamental del sitio, este obtenido a partir de relaciones espectrales H/V utilizando registros de la Base de Datos de Movimiento Fuerte de Costa Rica. Las relaciones H/V se estiman con espectros de respuesta de aceleración con 5% de amortiguamiento y con espectros de amplitud de Fourier tradicionales obtenidos de la ventana de ondas S. A partir de la relación entre VS30 y Tf, fueron asignados diferentes rangos de Tf a la clasificación de perfil de suelo existente y se propone un gráfico con tres líneas y cuatro áreas para clasificar las estaciones de la RACR.
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