Anomalías termales de origen volcánico detectadas mediante imágenes satelitales Landsat: Caso del volcán Villarrica en el periodo 1984-1988
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2018
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es
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Universidad Andrés Bello
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El método pixel por pixel y método de tres bandas tres componentes realizado a 32 imágenes satelitales Landsat TM 5 del Volcán Villarrica (39,42°S; 71,93°O) correspondientes al periodo abarcado entre 1984 a 1988, entregaron 4 casos con actividad efusiva visible. Los resultados de radiancia para los casos del 11 de abril de 1986, 20 de octubre de 1986 y 31 de enero de 1987 fueron peaks mínimos de 255,666, 292,302 y 70,622 W/m2srμm para la Banda 5 y 293,991, 415,883 y 198,72 W/m2srμm para la Banda 7 respectivamente. Respecto al cuarto caso, correspondiente a la fecha del 16 de julio de 1986, se obtienen valores de 626,757 W/m2srμm para la Banda 5 y 521,31 W/m2srμm para la Banda 7, resultados que difieren notablemente en magnitud, respecto de los demás casos (>100 W/m2srμm en B7 y >300 W/m2srμm en B5). Por otra parte, no es posible calcular los valores del flujo de calor y masa para estas fechas exceptuando la imagen del 16 de julio de 1986, la cual alcanza un valor de Flujo de Calor Total mínimo de 592,73 MW y un máximo de 632,606 MW, y un Flujo de Masa que varía entre un mínimo de 16,99 Kgs-1 hasta 75,56 Kgs-1. Estos últimos se contradicen enormemente con los datos bibliográficos, razón por la cual se descartan estos resultados. El comportamiento y evolución de estos parámetros se ve marcado por peaks de radiancia espectral que superan los 500 W/m2srμm y culminan en un descenso abrupto para la fecha con actividad efusiva, mientras que el flujo de calor presenta un patrón de descenso que va desde 31 MW hasta 159 MW y 58 MW hasta 188 MW solo para las a las fechas previas a los casos eruptivos del 11 de abril de 1986 y 31 de enero de 1987.
The pixel-by-pixel method and the three-component three-band method performed on 32 Landsat TM 5 satellite images of the Villarrica Volcano (39.42 ° S, 71.93 ° W) for the period from 1984 to 1988, resulted in 4 with visible effusive activity. Radiance results for the cases of April 11 of 1986, October 20 of 1986 and January 31 of 1987 were minimum peaks of 255,666, 292,302 and 70,622 W/m2srμm for Band 5 and 293,991, 415,883 and 198.72 W/m2srμm for Band 7 respectively. Regarding the fourth case, corresponding to the date of July 16 of 1986, values of 626,757 W/m2srμm were obtained for Band 5 and 521.31 W/m2srμm for Band 7, results that differ significantly in magnitude with respect to other 3 cases (> 100 W/m2srμm in B7 and > 300 W/m2srμm in B5). On the other hand, it is not possible to calculate the values of Heat Flux and Mass Flux for these dates, except for the image of July 16 of 1986, which reaches a total Minimum Heat Flux of 592.73 MW and a maximum of 632,606 MW, and a Mass Flux that varies between a minimum of 16.99 Kgs-1 to 75.56 Kgs-1 . These last ones contradict enormously with the bibliographic data, reason for which these results are discarded. The behavior and evolution of these parameters is marked by peaks of spectral radiance that exceed 500 W/m2srμm and culminate in an abrupt drop for the date with effusive activity, while the Heat Flux presents a pattern of fall that goes from a minimum difference of 31 MW up to 159 MW and 58 MW up to 188 MW only for the dates prior to the eruptive cases of April 11 of 1986 and January 31 of 1987.
The pixel-by-pixel method and the three-component three-band method performed on 32 Landsat TM 5 satellite images of the Villarrica Volcano (39.42 ° S, 71.93 ° W) for the period from 1984 to 1988, resulted in 4 with visible effusive activity. Radiance results for the cases of April 11 of 1986, October 20 of 1986 and January 31 of 1987 were minimum peaks of 255,666, 292,302 and 70,622 W/m2srμm for Band 5 and 293,991, 415,883 and 198.72 W/m2srμm for Band 7 respectively. Regarding the fourth case, corresponding to the date of July 16 of 1986, values of 626,757 W/m2srμm were obtained for Band 5 and 521.31 W/m2srμm for Band 7, results that differ significantly in magnitude with respect to other 3 cases (> 100 W/m2srμm in B7 and > 300 W/m2srμm in B5). On the other hand, it is not possible to calculate the values of Heat Flux and Mass Flux for these dates, except for the image of July 16 of 1986, which reaches a total Minimum Heat Flux of 592.73 MW and a maximum of 632,606 MW, and a Mass Flux that varies between a minimum of 16.99 Kgs-1 to 75.56 Kgs-1 . These last ones contradict enormously with the bibliographic data, reason for which these results are discarded. The behavior and evolution of these parameters is marked by peaks of spectral radiance that exceed 500 W/m2srμm and culminate in an abrupt drop for the date with effusive activity, while the Heat Flux presents a pattern of fall that goes from a minimum difference of 31 MW up to 159 MW and 58 MW up to 188 MW only for the dates prior to the eruptive cases of April 11 of 1986 and January 31 of 1987.
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Tesis (Geología)
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Vulcanismo, Modelos Matemáticos, Volcanes, Satélites Metereológicos, Chile