HR: 0800h
AN: V51A-03    [Abstracts]
TI: Isopach map and Characteristics of the Ashfall Deposits From Parícutin Volcano, (México)
AU: * Pérez Bustamant, J
EM: jcperezb@pep.pemex.com
AF: Facultad de Ingeniería, UNAM, Av. Universidad 3000 Coyoacan, Mexico, D.F 04510, Mexico
AU: Delgado Granados, H
EM: hugo@geofisica.unam.mx
AF: Instituto de Geofísica, UNAM, Av. Universidad 3000 Coyoacan, Mexico, D.F 04510, Mexico
AU: Linares Lopez, C
EM: linaresc@geofisica.unam.mx
AF: Laboratorio Universitario de Petrología, UNAM, Av. Universidad 3000 Coyoacan, Mexico, D.F 04510, Mexico
AU: Victoria Morales, A
EM: victoria@servidor.unam.mx
AF: Facultad de Ingeniería, UNAM, Av. Universidad 3000 Coyoacan, Mexico, D.F 04510, Mexico
AU: Farraz Montes, I A
EM: abimelec@geofisica.unam.mx
AF: Instituto de Geofísica, UNAM, Av. Universidad 3000 Coyoacan, Mexico, D.F 04510, Mexico
AB: Parícutin volcano belongs to the Michoacán-Guanajuato volcanic field located in the central portion of the state of Michoacán, in western Mexico, approximately 50 km northwest of the town of Uruapan. Parícutin is the famous Mexican volcano born in a cornfield in 1943 erupting until 1952, and has been the object of many studies since its birth up to now. In 1946 Segerstrom & Kenneth (1950) initiated the first geological study of Parícutin Volcano. In their work, they published the only existing isopach map of the fall deposits. In the summer of 2005, fieldwork was carried at Parícutin volcano in which a new isopach map was generated. This new isopach map was build by direct measurement of total thicknesses of the in situ ashfall deposits (reworked material was not included) at trenches dug around the volcano. Also, sampling and description of Parícutin tephras, stratigraphy combined with modern processing and analytical tools (as compared with those existing by the time the first studies were done) were done. Forty-two trenches were excavated, and ground-penetrating-radar (GPR) profiles were also performed. In this work we present the differences resulting from the comparison between the Segerstrom & Kenneth (1950) isopach map and our map build half century later. This difference in time implies changes due to erosion and the availability of modern geophysical tools. We also present the results of detail granulometric analyses as well as a quantification of the volume of materials emitted during the eruption and volumes removed by erosion.
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