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Kratzmann, D.J.; Carey, S.N.; Fero, J.; Scasso, R.A.; Naranjo, J.-A. "Simulations of tephra dispersal from the 1991 explosive eruptions of Hudson volcano, Chile" (2010) Journal of Volcanology and Geothermal Research. 190(3-4):337-352
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Abstract:

The 1991 explosive eruptions of Hudson volcano in southern Chile produced 2.7 km3 (dense rock equivalent) of basalt and trachyandesite tephra during the period August 8-15. The initial basaltic phase (phase I, August 8-9) produced a maximum column height of 12 km above sea level (ASL) and tephra fallout was directed to the north and northeast by the prevailing winds. The paroxysmal trachyandesitic phase (phase II, August 12-15) involved at least three separate events with a maximum ∼ 18-km-high (ASL) eruption column inferred from satellite temperature data. During the initial 24 h of this phase the plume was advected almost directly south, before swinging towards the east as the wind changed direction. The plume was ultimately directed to the southeast and stayed relatively fixed at this bearing for the remainder of the eruption. These temporal variations in the main dispersal direction during the earlier stages of the phase II eruption produced a much wider overall deposit than would be expected from a plume with a relatively fixed transport direction (e.g., latter stages of phase II). The Lagrangian ash tracking model PUFF was utilized to simulate the 1991 explosive eruptions and was able to successfully reproduce the aerial distribution and temporal evolution of the plumes. The optimal agreement between the observed and simulated plumes occurs when the highest concentration of ash particles coincides with the tropopause, a height that is typically lower than the maximum observed column heights for the 1991 eruptions. Gravitational settling of the laterally spreading umbrella region (e.g., Pinatubo 1991) may result in the concentration of ash at this level. This may account for differences in column height estimates between ground- or satellite-based and lithic-based models. The plume associated with the paroxysmal phase (August 12-15, 1991) produced a multilayered deposit composed of alternating layers of fine ash and pumice lapilli. The highly stratified nature of the fall deposit is likely the result of multiple eruptive events coupled with a time varying wind field. A strongly changing wind direction that occurred during the earlier stages of the paroxysmal eruption could have produced variations in the dominant grain size being deposited between fine ash and pumice lapilli during individual eruptive sequences. © 2009 Elsevier B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Simulations of tephra dispersal from the 1991 explosive eruptions of Hudson volcano, Chile
Autor:Kratzmann, D.J.; Carey, S.N.; Fero, J.; Scasso, R.A.; Naranjo, J.-A.
Filiación:Graduate School of Oceanography, Univ. of Rhode Island, South Ferry Rd, Narragansett, RI 02882, United States
Departamento de Geología, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria Pab. II, 1428 Buenos Aires, Argentina
Servicio Nacional de Geología y Minería, Casilla, 10465, Santiago, Chile
Palabras clave:Hudson volcano; PUFF simulations; Southern Volcanic Zone; tephra dispersal; tropospheric transport; wandering plume; Aerial distribution; Alternating layers; Ash particles; Column height; Concentration of; Eruptive events; Explosive eruption; Grain size; Gravitational settlings; Hudson Volcano; Lagrangian; Multi-layered; Phase I; Phase II; Pinatubo; Prevailing winds; Temperature data; Temporal evolution; Temporal variation; Tephra dispersal; Tephra fallout; Time varying; Tracking models; Transport direction; Volcanic zone; Wind directions; Wind field; Deposits; Oceanography; Troposphere; Volcanoes; andesite; atmospheric transport; basalt; computer simulation; concentration (composition); dispersion; explosive volcanism; mantle plume; numerical model; pumice; tephra; tropopause; volcanic ash; volcanic eruption; volcaniclastic deposit; volcanology; Aisen; Chile; Mount Hudson; Southern Volcanic Zone; Pinatubo
Año:2010
Volumen:190
Número:3-4
Página de inicio:337
Página de fin:352
DOI: http://dx.doi.org/10.1016/j.jvolgeores.2009.11.021
Título revista:Journal of Volcanology and Geothermal Research
Título revista abreviado:J. Volcanol. Geotherm. Res.
ISSN:03770273
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03770273_v190_n3-4_p337_Kratzmann

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Citas:

---------- APA ----------
Kratzmann, D.J., Carey, S.N., Fero, J., Scasso, R.A. & Naranjo, J.-A. (2010) . Simulations of tephra dispersal from the 1991 explosive eruptions of Hudson volcano, Chile. Journal of Volcanology and Geothermal Research, 190(3-4), 337-352.
http://dx.doi.org/10.1016/j.jvolgeores.2009.11.021
---------- CHICAGO ----------
Kratzmann, D.J., Carey, S.N., Fero, J., Scasso, R.A., Naranjo, J.-A. "Simulations of tephra dispersal from the 1991 explosive eruptions of Hudson volcano, Chile" . Journal of Volcanology and Geothermal Research 190, no. 3-4 (2010) : 337-352.
http://dx.doi.org/10.1016/j.jvolgeores.2009.11.021
---------- MLA ----------
Kratzmann, D.J., Carey, S.N., Fero, J., Scasso, R.A., Naranjo, J.-A. "Simulations of tephra dispersal from the 1991 explosive eruptions of Hudson volcano, Chile" . Journal of Volcanology and Geothermal Research, vol. 190, no. 3-4, 2010, pp. 337-352.
http://dx.doi.org/10.1016/j.jvolgeores.2009.11.021
---------- VANCOUVER ----------
Kratzmann, D.J., Carey, S.N., Fero, J., Scasso, R.A., Naranjo, J.-A. Simulations of tephra dispersal from the 1991 explosive eruptions of Hudson volcano, Chile. J. Volcanol. Geotherm. Res. 2010;190(3-4):337-352.
http://dx.doi.org/10.1016/j.jvolgeores.2009.11.021