Volcanic hazard from San Martin Tuxtla Volcano,Tuxtla Volcanic Field,Veracruz, México: probability maps of ashfall deposition from possible future eruption |
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Authors: | Espíndola J M Godinez M L Zamora-Camacho A |
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Institution: | 1.Universidad Nacional Autónoma de México, Instituto de Geofísica, Av. Universidad 3000, 04510, Mexico D.F., Mexico ;2.Universidad Nacional Autónoma de México, Instituto de Geografía, Av. Universidad 3000, 04510, Mexico D.F., Mexico ; |
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Abstract: | San Martin Tuxtla Volcano, the largest and highest edifice in the Tuxtla Volcanic Field, had explosive eruptions in 1664 and
1793. This volcano poses the highest hazard for the growing population centers surrounding it. The impacts and deposits of
the 1793 eruption have been studied recently, and some of its characteristics, such as eruptive mass, grain-size distribution
of the products and plume height, have been estimated. These data, together with daily data on wind velocities taken in the
nearby city of Veracruz, have been used to conduct numerical modeling of ash distribution from an eruptive column comparable
to that estimated during the 1793 event. Using wind velocities of randomly chosen days, we constructed probability maps of
areas likely to receive, at least 1, 5, or 10 cm of ash. Our results indicate that an area about 1.3 × 104 km2 has a 12% probability of being covered by an ash fall more than 1 cm thick, if a mass of 1014 g was erupted and deposited from a 10-km-high eruptive plume. The results presented in this paper serve as a scientific basis
to estimate volcano risk in the area from a possible eruption, consisting of one or several large explosive events, at San
Martin Tuxtla volcano. |
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