Relocalización de sismos volcano-tectónicos en el Volcán Galeras a partir de la correlación cruzada de formas de onda
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Lizarazo Calderón, Miguel Johan
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Se relocalizaron sismos Volcano-Tectónicos en el Volcán Galeras, usando el catálogo de formas de onda y de localizaciones de sismos, compilados por la red de monitoreo del Observatorio Volcanológico y Sismológico de Pasto. Se desarrollaron varias rutinas en MATLAB®, principalmente para preparar las formas de onda, calcular tiempos de viaje diferenciales, e identificar familias de sismos; y se implementó el programa HypoDD, que permitió realizar la relocalización. Se detectaron 10 familias de enjambres y 4 familias espaciales de sismos, que revelan una falla de 1.6 km que delimita la caldera Urcunina, y una falla anular de 1.8 km de diámetro, vecina al cráter. Se lograron disminuciones en la incertidumbre de los parámetros hipocentrales espaciales, entre el 56.84% y el 87.48%, respecto a la incertidumbre obtenida en la localización tradicional. Obteniéndose finalmente, una imagen alternativa con una incertidumbre significativamente inferior de la distribución de sismos Volcano-Tectónicos en el Volcán Galeras.
Abstract. Volcano-Tectonic earthquakes at Galeras Volcano were relocated using the waveform and preliminary phase arrival data compiled by the monitoring network at Observatorio Volcanológico y Sismológico de Pasto. Several routines were developed in MATLAB®, mainly to prepare waveforms, calculate differential travel times, and identifying seismic families; and the HypoDD program was implemented, which allowed performing the relocations. The procedure resulted in the detection of 10 swarm-type families and 4 spatial-type families of earthquakes, which reveal a fault of 1.6 km bounding the Urcunina Caldera, and a ring fault of 1.8 km in diameter, adjacent to the crater. Variance reductions in the range 56.84% - 87.48% were achieved in the hypocentral parameters compared to traditional locations, to finally obtain an improved image of the Volcano-Tectonic earthquake distribution at Galeras Volcano VG.
Abstract. Volcano-Tectonic earthquakes at Galeras Volcano were relocated using the waveform and preliminary phase arrival data compiled by the monitoring network at Observatorio Volcanológico y Sismológico de Pasto. Several routines were developed in MATLAB®, mainly to prepare waveforms, calculate differential travel times, and identifying seismic families; and the HypoDD program was implemented, which allowed performing the relocations. The procedure resulted in the detection of 10 swarm-type families and 4 spatial-type families of earthquakes, which reveal a fault of 1.6 km bounding the Urcunina Caldera, and a ring fault of 1.8 km in diameter, adjacent to the crater. Variance reductions in the range 56.84% - 87.48% were achieved in the hypocentral parameters compared to traditional locations, to finally obtain an improved image of the Volcano-Tectonic earthquake distribution at Galeras Volcano VG.