A gravity current model for the May 18, 1980 Mount St. Helens plume

Details A gravity current model for the May 18, 1980 Mount St. Helens plume A gravity current model for the May 18, 1980 Mount St. Helens plume

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1663b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 16, Aug. 21, 1992, p. 1663-1666. Research supported by Venture Resea

Physics

18

Effusives, Gravitational Effects, Plumes, Pollution Transport, Stratosphere, Volcanoes, Atmospheric Diffusion, Grain Size, Mathematical Models, Turbulent Diffusion

Scientific paper

Observations of the stratospheric plume from the May 18, 1980 Mount St. Helens eruption suggest that it spread in the crosswind direction as an intrusive gravity current, as it was transported downwind. Grain size analyses of the plinian tephra are consistent with this model, suggesting that to distances of many hundreds of kilometers, turbulent atmospheric diffusion played a secondary role in plume spreading and tephra dispersal.

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