HR: 1340h
AN: V13B-1481    [Abstracts]
TI: The Activity Of The Colima Volcano From 1999 To The 2003
AU: * Suarez-Plascencia, C
EM: csuarez@cencar.udg.mx
AF: DGOT, Universidad de Guadalajara, Mariano Barcena y Av. de los Maestros, Guadalajara, JAL 44100 Mexico
AU: Nu¤ez-Cornu, F
EM: pacornu77@yahoo.com.mx
AF: SISVOC, Universidad de Guadalajara, Av. Universidad 203, Puerto Vallarta, JAL 48280 Mexico
AU: Reyes-Davila, G
EM: gard@cgic.ucol.mx
AF: RESCO, Universidad de Colima, Av. Universidad 333, Colima, COL 28040 Mexico
AU: Diaz-Torres, J
EM: gitano@yahoo.com.mx
AF: DGOT, Universidad de Guadalajara, Mariano Barcena y Av. de los Maestros, Guadalajara, JAL 44100 Mexico
AB: The Colima Volcano has shown intense activity since the 10th of February 1999. This explosive activity of 1999 and 2000 generated an elliptical crater of 260 x 265 m, which began to be filled in by a Dome from October 2001, at February 2002 the volume of the Dome was of approximately 2x106 m3 spreading over the edges of the crater and starting to flow during the following 11 months, in this period small lobes formed on the flanks of the volcano. Constants landslides originated in these lobes filled ravines of San Antonio, El Cordovan, El Muerto, El Cafesito and Atenquique (subsequent to the earthquake of January of the 2003) with non consolidated materials, increasing the hazard of lahares during the rainy season. Beginning February 2003 the explosive activity increased, most significantly from April to August, when the plumes reached heights over 2000 meters above the crater, occasionally small pyroclastic flows were observed. The explosive events continue to date. We mapped the most significant morphological changes produced at the summit by the activity described, using three photogrammetric flights conducted by INEGI (2003) and CARTODATA (2002 and 2003). These were data complemented by a very large number of photographs taken on helicopter flights undertaken during these months. Both the photographs and the digital mapping have provided detailed information to quantify the geomorphologic evolution of the superior section of the volcano, in the course of the last five years.
DE: 8429 Lava rheology and morphology
DE: 8499 General or miscellaneous
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2004 AGU Fall Meeting