Volcanic hazards in the surroundings of Pico de Orizaba,eastern Mexico |
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| Authors: | Ármann Höskuldsson Jean Marie Cantagrel |
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| Institution: | (1) Department of Geology, Université Blaise Pascal, OPGC, CRV, 5 rue Kessler, 63038 Clermont Ferrand, France;(2) Present address: Department of Geology, University of Bristol, Wills Memorial Building, Queens Road, BS8-IRJ Bristol, U.K. |
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| Abstract: | Volcanic hazards from Pico de Orizaba volcano are presented here tor the first time. Some 1.3 million people live within the hazard zone, which in the most severe case would encompass the Mexican Gulf coast, east of the volcano. Three major cities located in the eastern part of the hazard zone account for 800 000 of this population and about 200 000 people live within a 20 km radius of the volcano. Probability calculations are presented as an attempt to quantify the hazards in the surroundings of the volcano. Such quantification can be of use in planning for future land use within the hazard zones.A zone of about 10 km radius centred on the top crater is a high hazard zone for gravity-driven flows and fallout ejecta. For large volume eruptions, the radius could be extended to 120 km to the east and 60 km to the west. The asymmetrical distribution is related to the topography of the volcano. Hazards from Pyroclastic-fall deposits are principally to the west of the volcano, since easterly winds are dominant in the area lava-flow hazards are greatest within a 10 km radius from the summit crater. Pyroclastic flow hazards are high up to 20 km from the volcano summit.In the case of reactivation of the volcano, melting of a glacier covering the summit of Pico de Orizaba having a volume equivalent to some 45 × 109 litres of water, would produce lahars which would descend the flanks of the volcano. |
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| Keywords: | Mexico Citlaltepetl volcanic lava pyroclastic epiclastic |
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