HR: 0800h
AN: V51A-10    [Abstracts]
TI: Mass Balance Calculation at Parícutin Volcano (Mexico): Erosion of Tephras 1946 - 2000
AU: * Navarro Moreno, C
EM: cinthianavarrom@hotmail.com
AF: Facultad de Filosofía y Letras, Universidad Nacional Autónoma de México, Av. Universidad 3000, Coyoacán, México, D.F 04510, Mexico
AU: Peña Pedraza, E
EM: karien_22@yahoo.com
AF: Facultad de Filosofía y Letras, Universidad Nacional Autónoma de México, Av. Universidad 3000, Coyoacán, México, D.F 04510, Mexico
AU: Delgado Granados, H
EM: hugo@tonatiuh.igeofcu.unam.mx
AF: Instituto de Geofísica, Universidad Nacional Autónoma de México, Av. Universidad 3000, Coyoacán, México, D.F 04510, Mexico
AU: Farraz Montes, I A
EM: abimelec@servidor.unam.mx
AF: Instituto de Geofísica, Universidad Nacional Autónoma de México, Av. Universidad 3000, Coyoacán, México, D.F 04510, Mexico
AB: On February 20, 1943 Parícutin volcano was born in the Michoacán-Guanajuato Volcanic Field in western Mexico. The eruption lasted 9 years and during this period several studies were carried out, among them, tephra deposition and erosion studies (Segerstrom, 1946; Fries, 1946). Segesrtrom & Kenneth obtained an isopach map from which the total volume of tephra could be determined. Fries recalculated the volume of tephra based on planimetric measurements using the isopach map of Segerstrom (1946) who also did erosion studies at the same time when getting thickness measurements for the construction of the isopach map. In the 50's Segerstrom observed and recorded mass movements and re-deposition of ashes by water streams and compared the capacity of the ashes for infiltration with that of the previous soil. He obtained a total change in infiltration patterns and drainage. No further work was done ever since so, in this study we show preliminary results on the calculation of erosion rates of tephras as compared to the volume reported for 1946. We show results on mass loss and erosive processes, as well as cone degradation with time. The erosion activity has been favored by climatic factors that we discuss. Calculation of mass balances was possible by construction and subtracting of digital elevation models at scales: 1:10000, 1:20000, and 1:50000 for 1946, 1995 and 2000, respectively.
DE: 8404 Volcanoclastic deposits
DE: 8425 Effusive volcanism
DE: 8428 Explosive volcanism
DE: 8486 Field relationships (1090, 3690)
DE: 8488 Volcanic hazards and risks
SC: Volcanology, Geochemistry, and Petrology [V]
MN: 2007 Joint Assembly