HR: 1400h
AN: V43A-04    [Abstracts]
TI: 2005-2006 Seismic Activity at Colima Volcano, Mexico
AU: * DOMINGUEZ, T
EM: tonatiuh@ucol.mx
AF: Universidad de Colima, Av. Gonzalo de Sandoval 444, Col. Las viboras, Colima, Col 28040, Mexico
AB: Colima volcano (19.51 N, 103.62 W, 3,950 m) is one of the most active volcanoes in México. It is located at the oriental end of the Mexican volcanic belt and with Nevado de Colima it forms a volcanic complex. The Colima seismic network (RESCO) has been monitoring the seismic activity since 1989 so we have records from the last four eruptions (1991, 1998-1999, 2001-2003 and 2004-2005). Since the 1998 eruption we could also measure deformation and SO2 . At the present time we are also monitoring activity with a tiltmeter network and two cameras which are continuously recording the outside activity. We also take periodically samples from springs and EDM. We present the general description of the seismicity since last eruption. Each eruption recorded from Colima volcano is different from the previous. The 2001-2003 eruption lasted for 15 months and it is considered the largest eruption (in time) of the last fifty years. It was characterized by a very low seismic activity previous to the eruption and tremors of large amplitudes never seen before during an effusive stage. The 2004-2005 eruption was characterized by a relative high rate of effusion (8-11 m3/s compared with the 4 m3 /s of that of 1998). During 2005 a series of explosions among which there were the largest ever recorded at Colima volcano occurred. After two years of mainly low intensity explosions, a new dome appeared so we are in the transition of explosive stage to effusive stage.
DE: 7280 Volcano seismology (8419)
DE: 8419 Volcano monitoring (7280)
SC: Volcanology, Geochemistry, and Petrology [V]
MN: 2007 Joint Assembly