HR: 1340h
AN: V53B-1554    [Abstracts]
TI: The explosive activity of the Colima volcano in 2005
AU: * Suarez-Plascencia, C
EM: csuarez@cencar.udg.mx
AF: CUCSH/SISVOC-CUC UNIVERSIDAD DE GUADALAJARA, MARIANO BARCENA Y AV. DE LOS MAESTROS, GUADALAJARA, JAL 44240 Mexico
AU: Nu¤ez-Cornu, F
EM: pacocornu77@gmail.com
AF: CUCSH/SISVOC-CUC UNIVERSIDAD DE GUADALAJARA, MARIANO BARCENA Y AV. DE LOS MAESTROS, GUADALAJARA, JAL 44240 Mexico
AU: Diaz-Torres, J
EM: jesus79_80@hotmail.com
AF: CUCSH/SISVOC-CUC UNIVERSIDAD DE GUADALAJARA, MARIANO BARCENA Y AV. DE LOS MAESTROS, GUADALAJARA, JAL 44240 Mexico
AB: The Colima volcano, Mexico, showed a new cycle of explosive activity beginning in March and April the 2005. This increased gradually and in May it appeared an explosive event which generated piroclastic flows on all flanks of the volcano. On May 23 a new dome was created, and it was observed from the Volcanological Observatory of the Nevado de Colima. Hours later its dome was destroyed by a strong explosion, which formed a column 3 km hight and piroclastic flows that reached a distance of 5 km on the ravines of the South sector. On May 30 the most intense explosion from 1999 occurred when the plume reached heights over 3.500 m above the crater, and piroclastic flows. In the month of June it generated four explosive events of characteristics similar to those of May. These constant explosions caused constant morphological changes on the top, being the most significant the collapse of the North and South walls of the crater in the first week of June, and the creation of a new crater in July. This activity was similar to the one shown 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 explosions deposited great amount of nonconsolidated materials, like ash, lithics and rocks on the flanks of the volcano, which with the present rainy season have generated lahares, two in the month of June, ten in July and eight in August (RESCO reports). These have flowed in small flows on the ravines of La Lumbre, Montegrande, San Antonio and La Arena. None of them have caused damages until August, 2005.
DE: 8419 Volcano monitoring (7280)
DE: 8428 Explosive volcanism
DE: 8488 Volcanic hazards and risks
SC: Volcanology, Geochemistry, Petrology [V]
MN: Fall Meeting 2005