SIMULACIÓN DEL CAMPO DE ONDAS SÍSMICAS Y CARACTERIZACIÓN DE AMPLITUD Y PERÍODO CON FINES DE MICROZONIFICACIÓN SÍSMICA PARA LAS CIUDADES GUARENAS-GUATIRE
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Universidad Industrial de Santander
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Se presentan los resultados de la simulación de la propagación de las ondas sísmicas en la cuenca Guarenas Guatire, estimando la respuesta sísmica 2D del suelo mediante la generación de sismogramas sintéticos. Esta simulación corresponde a la propagación a lo largo de secciones 2D de la cuenca preparadas a partir de la información geológica y geofísica local y regional. Se empleó la técnica denominada método híbrido, que utiliza los métodos analítico (suma modal de ondas superficiales) y numérico (diferencias finitas), para obtener los sismogramas sintéticos hasta una frecuencia de 10 Hz a lo largo de ocho perfiles de dirección norte-sur y sur-norte y tres perfiles oeste-este de la cuenca sedimentaria de Guarenas-Guatire. Se escogieron tres eventos escenarios, ubicados en: La Falla San Sebastián, la Falla Pichao (sist. La Victoria) y la Falla Tacagua, con magnitudes de 7, 6 y 5 Mw, respectivamente. Se obtuvieron los siguientes parámetros en superficie: relación 2D/1D espectral de las componentes horizontales y verticales H/V de la aceleración, y relación 2D/1D del espectro de respuesta de aceleración, para las componentes transversal, radial y vertical. Se elaboraron espectros de respuesta de aceleración horizontal para la superficie a partir de las relaciones promedios de espectros de respuesta (consideradas como funciones de transferencia) y el espectro de respuesta de roca obtenido de un estudio de amenaza sísmica regional.
We present the results of the simulation of seismic wave propagation in complex geological media through numerical calculation, estimating the 2D/1D seismic soil response by generating synthetic seismograms. This simulation corresponds to the propagation along 2D sections of the basin prepared by using local and regional geological and geophysical information. The hybrid methods technique was applied, that uses analytical (modal summation of surface waves) and numerical (finite differences) methods to obtain synthetic seismograms up to a frequency of 10 Hz, along 8 north-south and south-north profiles, and 3 east-west profiles crossing the sedimentary basin of Guarenas-Guatire. Three scenario earthquake were chosen, located along: San Sebastian, Pichao (system La Victoria) and Tacagua Faults, with magnitudes of 7, 6 and 5 Mw, respectively. The following ground motion parameters were obtained : 2D/1D spectral ratio of the horizontal and vertical components H/V, and 2D/1D acceleration response spectrum ratio for the transverse, radial and vertical components. Response spectra of horizontal acceleration for the ground surface were developed from averages relations of response spectra (considered as transfer functions) and response spectrum at bedrock obtained from a regional seismic hazard study.
We present the results of the simulation of seismic wave propagation in complex geological media through numerical calculation, estimating the 2D/1D seismic soil response by generating synthetic seismograms. This simulation corresponds to the propagation along 2D sections of the basin prepared by using local and regional geological and geophysical information. The hybrid methods technique was applied, that uses analytical (modal summation of surface waves) and numerical (finite differences) methods to obtain synthetic seismograms up to a frequency of 10 Hz, along 8 north-south and south-north profiles, and 3 east-west profiles crossing the sedimentary basin of Guarenas-Guatire. Three scenario earthquake were chosen, located along: San Sebastian, Pichao (system La Victoria) and Tacagua Faults, with magnitudes of 7, 6 and 5 Mw, respectively. The following ground motion parameters were obtained : 2D/1D spectral ratio of the horizontal and vertical components H/V, and 2D/1D acceleration response spectrum ratio for the transverse, radial and vertical components. Response spectra of horizontal acceleration for the ground surface were developed from averages relations of response spectra (considered as transfer functions) and response spectrum at bedrock obtained from a regional seismic hazard study.
Keywords
simulation, seismic wave propagation, response spectra, sedimentary basin, Guarenas, Guatire, simulación, propagación de ondas sísmicas, espectros de respuesta, cuenca sedimentaria, Guarenas, Guatire