HR: 0800h
AN: V41D-0804    [Abstracts]
TI: The activity of the Colima volcano and morphological changes in the summit between 2004 and 2007.
AU: * Suarez-Plascencia, C
EM: csuarez@cencar.udg.mx
AF: DGOT, U de G/CICESE, Mariano Barcena y Av. de los Maestros, Guadalajara, Jal 44100, Mexico
AU: Nuņez-Cornu, F J
EM: pacornu77@gmail.com
AF: SISVOC U de G, Av. Ixtapa S/N, Puerto Vallarta, Jal 48280, Mexico
AU: Sanchez -Aguilar, J
AF: SISVOC U de G, Av. Ixtapa S/N, Puerto Vallarta, Jal 48280, Mexico
AU: Arriaga, F
EM: farriaga@cartodata.com
AF: CartoData Cartodata, Av. Circunvalacion Oriente 689, Guadalajara, Jal 45010, Mexico
AB: Colima Volcano, located in the West of the Volcanic Mexican Belt, has shown a new cycle of explosive activity beginning May 30 1999, and reaching its maximum in March and April of 2005. This year the explosive activity increased gradually, having the largest event on May 23, when a new dome was created. Hours later this dome was destroyed by a strong explosion, forming an ash column 5.6 km high with subsequent pyroclastic flows that reached a distance of 4.2 km flowing along the ravines of the South sector. On May 30 the most intense explosion in 1999 occurred, when the plume reached heights in excess of 4.4 km above the crater, and piroclastic flows were created. On the same year in July two explosive events occurred of characteristics similar to those in May. These constant explosions caused continuos morphological changes in the summit, the most significant being the collapse of the North and South walls of the crater, in the first week of June of 2005, and the creation of a new crater in July. In 2006 the most significant explosive activity took place during April, May and July, when the eruptive columns reached heights of more than 1500 meters above the crater, occasionally forming small pyroclastic flows. In May of 2007 morphological changes were observed in the summit. Among them a crater explosion on the East side, a new dome was formed on the West side, with 20 m in high and 50 m in diameter. The explosive events continue to date, but they have diminished in size and intensity. This activity was similar to the one observed in 1902-1903 and reported by Severo Diaz (1906), but without reaching the maximum levels of activity reported for 1903, where it had levels of three to five maximum explosive events per day. The photographs and the digital mapping have provided detailed information to quantify the dynamic evolution of the volcanic structures that developed on the summit of the volcano in the course of the last for years.
DE: 8419 Volcano monitoring (7280)
DE: 8428 Explosive volcanism
DE: 8488 Volcanic hazards and risks
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2007 Fall Meeting