HR: 17:35h
AN: V44A-06    [Abstracts]
TI: Volcanic Ash fall Impact on Vegetation, Colima 2005
AU: * Garcia, M G
EM: alex103mx@yahoo.com.mx, mirna_garcia@ciencias.unam.mx
AF: Instituto de Geofísica, UNAM, Circuito exterior S/N zona de institutos. Cuidad Universitaria., Mexico City, DF 04510, Mexico
AU: Martin, A
EM: analil@geofisica.unam.mx
AF: Instituto de Geofísica, UNAM, Circuito exterior S/N zona de institutos. Cuidad Universitaria., Mexico City, DF 04510, Mexico
AU: Fonseca, R
EM: rifon@geofisica.unam.mx
AF: Instituto de Geofísica, UNAM, Circuito exterior S/N zona de institutos. Cuidad Universitaria., Mexico City, DF 04510, Mexico
AU: Nieto, A
EM: amielnieto@ciencias.unam.mx
AF: Instituto de Geofísica, UNAM, Circuito exterior S/N zona de institutos. Cuidad Universitaria., Mexico City, DF 04510, Mexico
AU: Radillo, R
EM: rozradillo@yahoo.com.mx
AF: Instituto de Geofísica, UNAM, Circuito exterior S/N zona de institutos. Cuidad Universitaria., Mexico City, DF 04510, Mexico
AU: Armienta, M
EM: victoria@tonatiuh.igeofcu.unam.mx
AF: Instituto de Geofísica, UNAM, Circuito exterior S/N zona de institutos. Cuidad Universitaria., Mexico City, DF 04510, Mexico
AB: An ash sampling network was established arround Colima Volcano in 2005. Ash fall was sampled on the North, Northeast, East, Southeast, South, Southwest and West of the volcano. Samples were analyzed for ash components, geochemistry and leachates. Ash fall ocurred on April (12), May (10, 23), June (2, 6, 9, 10, 12, 14), July (27), September (27), October (23) and November (24). Most of the ash is made of andesitic dome-lithics but shows diferences in crystal, juvenile material and lithic content. In May, some samples contained grey and dark pumice (scoria). Texture varies from phi >4 to phi 0. Leachate concentration were low: SO4 (7.33-54.19) Cl- (2.29-4.97) and F- (0.16-0.37). During 2005, Colima Volcano's ash fall rotted some of the guava and peach fruits and had a drying effect on spearment and epazote plants. Even these small ash amounts could have hindered sugar cane and agave growth.
DE: 8419 Volcano monitoring (7280)
SC: Volcanology, Geochemistry, and Petrology [V]
MN: 2007 Joint Assembly