Resumo

JIMENEZ-ESCALONA, José Carlos; DELGADO GRANADOS, Hugo  e  REALMUTO, Vincent J.. Use of MODIS images to study eruptive clouds from Volcán de Fuego de Colima (México) and applications on volcano monitoring. Geofís. Intl [online]. 2011, vol.50, n.2, pp.199-210. ISSN 2954-436X.

Volcano monitoring using satellite images may provide periodic information on gas emission fluctuations such as SO₂ emissions related to the processes occurring inside volcanoes. This study analyses a period of 36 days (May 10 to June 15, 2005) of processing 113 MODIS images for the detection of SO₂. Within this period it was also possible to detect and quantify 8 of 15 explosive events reported by the Washington VAAC. With the satellite images as tools for monitoring the volcanic emissions, it was possible to determine three cases related to volcanic ashes: 1) follow up of volcanic ash and gases transported by wind, 2) calculation of ash-cloud residence time in the atmosphere, 3) effects of shearing winds during the ascent of an ash plume. Regarding the continuous monitoring of passive emissions of SO₂, there is a relationship among explosive events and increasing peaks of SO₂ emission suggesting a difference of approximately 2 days between the two events that may anticipate the type of behavior of the volcano.

Palavras-chave : remote sensing; volcanic emission; MODIS; satellite image; Colima volcano; volcanic cloud.

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