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Small particles in plumes of Mount St. HelensParticles in the size range 0.1-25 microns were sampled by aircraft carrying a quartz crystal microcascade in the Mount St. Helens plume on three dates in August and September 1980. Two of the sampling dates represented 'typical' emissions of the volcano between plinian eruptions. One sampling flight was made 1-4 hours before the small plinian eruption of August 7, 1980 when the plume had become discontinuous and visibly darker. The plume sampled on August 7, before the eruption, contained mainly approximately 2-micron diameter silicic glass particles, fragments of the Mount St. Helens magma. The typical plumes sampled on September 22 and August 6 had much smaller concentrations of particles, trimodal size distributions with peaks at 10, 0.4, and 0.1 microns. The particles were largely nonsilicate and apparently represented Cu-Zn oxide (10 micron peak), Al sulfate, chloride, and oxide, and sulfuric acid (smallest size peak).
Document ID
19820052358
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Rose, W. I.
(Michigan Technological University Houghton, MI, United States)
Chuan, R. L.
(Brunswick Corp. Costa Mesa, CA, United States)
Woods, D. C.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 10, 2013
Publication Date
June 20, 1982
Publication Information
Publication: Journal of Geophysical Research
Volume: 87
Subject Category
Geophysics
Accession Number
82A35893
Funding Number(s)
CONTRACT_GRANT: NAGW-84
Distribution Limits
Public
Copyright
Other

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