Sulfur dioxide emissions from Popocatepetl volcano (Mexico): case study ofa high-emission rate, passively degassing erupting volcano

Citation
H. Delgado-granados et al., Sulfur dioxide emissions from Popocatepetl volcano (Mexico): case study ofa high-emission rate, passively degassing erupting volcano, J VOLCANOL, 108(1-4), 2001, pp. 107-120
Citations number
48
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
ISSN journal
0377-0273 → ACNP
Volume
108
Issue
1-4
Year of publication
2001
Pages
107 - 120
Database
ISI
SICI code
0377-0273(20010815)108:1-4<107:SDEFPV>2.0.ZU;2-O
Abstract
Popocatepetl volcano in central Mexico has been erupting explosively and ef fusively for almost 4 years. SO2 emission rates from this volcano have been the largest ever measured using a COSPEC. Pre-eruptive average SO2 emissio n rates (2-3 kt/d) were similar to the emission rates measured during the f irst part of the eruption (up to August 1995) in contrast with the effusive - explosive periods (March 1996-January 1998) during which S O-2 emission rates were higher by a factor of four (9-13 kt/d). Based on a chronology of the eruption and the average SO2 emission rates per period, the total SO2 emissions (up to I January 1998) are estimated to be about 9 Mt, roughly ha lf as much as the SO2, emissions from Mount Pinatubo in a shorter period. P opocatepetl volcano is thus considered as a high-emission rate, passively d egassing eruptive volcano. SO2 emission rates and SO2 emissions are used he re to make a mass balance of the erupted magma and related gases. Identifie d excess SO2 is explained in terms of continuous degassing of unerupted mag ma and magma mixing. Fluctuations in SO2 emission rate may be a result of c onvection and crystallization in the chamber or the conduits, cleaning and sealing of the plumbing system, and/or SO2 scrubbing by the hydrothermal sy stem. (C) 2001 Elsevier Science B.V. All rights reserved.