In this article, we present a strong-motion database from earthquakes recorded by the Earthquake Engineering Laboratory at the University of Costa Rica. The database consists of 2471 three-component accelerograms from 155 digitally recorded events. It covers the last 20 yr of measurements, including records from the 5 September 2012 Mw 7.6 Nicoya earthquake. The engineering and seismological communities can use this data either to conduct new research or to improve seismic hazard studies in the region. A catalog is also available with metadata of each record containing several intensity measures from the ground-motion time histories.
ResumenSe describen los diferentes programas de cómputo desarrollados en el Laboratorio de Ingeniería Sísmica (LIS) para el procesamiento y actualización de su base de datos de sismos fuertes. Los programas fueron ejecutados usando los lenguajes de programación FORTRAN-77 y PYTHON, con el objetivo de leer los diferentes formatos según el tipo de instrumentos y luego unirlos en uno solo, el cual se adoptaría como el estándar. Los programas, como tales, pueden ser instalados en cualquier máquina que corra bajo el ambiente LINUX, pero la base puede ser consultada desde máquinas que utilicen otro ambiente como el de Windows o el de UNIX por medio del lenguaje PYTHON. El resultado más importante fue que se pudo depurar la enorme cantidad de registros que el Laboratorio ha ido acumulando a lo largo del tiempo. También, el nuevo formato permite que haya un intercambio de información de forma mucho más confiable, completa y rápida que antes, pues el encabezado incluye todos los aspectos sismológicos necesarios para elaborar mapas, graficar las señales, etc.Palabras clave: movimiento fuerte, sismos, FORTRAN, formato, acelerógrafo, programas de cómputo. AbstractThis is a study where we describe the different computer programs that were developed at the Earthquake Engineering Laboratory to manage and update the strong motion records. The programs were developed using FORTRAN-77 and PYTHON languages which worked according to the type of instrument that recorded the earthquake and wrate the information in a single, standard format. The computer programs can be installed and compiled in any LINUX based system and accesed from any other OS such as Windows or UNIX through the PYTHON language. The most important result was that we were able to update all the records that the laboratory had been gathering through time. Also, the new format allows the exchange of information in a more reliable, complete, and faster way than before because the header contains all seismological aspects to map or plot the signals.
We conducted a stochastic simulation to estimate the peak ground acceleration. In this study, we are interested in finding out what the peak ground acceleration might have been in close to the city of Cartago due to the 1910 event. Then, we simulated another scenario but locating the epicenter close to the region of Tobosi. The results indicate that if a magnitude 6.0 earthquake were to ocurr today in that region, it could cause peak ground accelerations of the order close to 1g. Due to its shallow depth, the event could quickly attenuate and reach San Jose with lesser intensity, but could be very severe for Cartago and structures built near the causative fault.
ResumenLa atenuación de ondas sísmicas en la alta frecuencia fue analizada mediante la determinación del parámetro Kappa para estaciones del Laboratorio de Ingeniería Sísmica (LIS) de la Universidad de Costa Rica. Los espectros de aceleración se graficaron en una escala semilogarítmica. Luego se calculó la recta de mejor ajuste usando mínimos cuadrados en el rango de 5 Hz a 20 Hz. Los valores de la pendiente se graficaron en función de la distancia hipocentral y se calculó el valor de la intersección con el eje vertical, conocido como efecto de sitio Kappa, κ 0 . Además de esto, se observó que también existe una clara dependencia de Kappa en función de la distancia para varias de las estaciones.Palabras clave: efectos de sitio, parámetro Kappa, atenuación sísmica, amplificación sísmica. AbstractAttenuation in the high-frequency range was analyzed by determining the attenuation parameter Kappa for several stations belonging to the Earthquake Engineering Laboratory (LIS) of the University of Costa Rica. Acceleration spectra were plotted on a semi-log scale from which a straight line fitting in the range from 5 Hz to 20 Hz was calculated. The values obtained were then plotted as a function of hypocentral distance and the intercept with the vertical axis was taken as corresponding to Kappa site effect, κ 0 . In addition to that, a strong distance dependence of Kappa was also observed at several stations.
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