Spectra of some Oaxaca earthquake aftershocks from RESMAC
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Fue calculado el espectro de las ondas S del evento principal y 21 réplicas del sismo de Oaxaca (Noviembre 29, 1978) registrados digitalmente a 500 Km del área epicentral en las estaciones sísmicas fijas telemétricas de RESMAC. Debido al ancho de banda en frecuencias del sistema RESMAC, el espectro de las ondas S del evento principal no muestra ninguna frecuencia de esquina. Este muestra dos pendientes a frecuencias altas (-2.0 y -2.8) intersectándose a una frecuencia de 1.4 HZ. La comparación de los espectros de las réplicas con aquellos obtenidos con las estaciones portátiles digitales cercanas, muestran un cambio de la frecuencia de esquina a bajas frecuencias típicamente del orden de 0.3 HZ y, en general, un valor pequeño, típicamente 4.3 menor, para el momento sísmico. EI espectro de la onda P no muestra ninguna frecuencia de esquina en los sismogramas de RESMAC.
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