TY - JOUR
T1 - Proximal air-fall deposits of eruptions (of Mount St. Helens) between May 24 and August 7, 1980 - stratigraphy and field sedimentology.
AU - Waitt, R. B.
AU - Hansen, V. L.
AU - Sarna-Wojcicki, A. M.
AU - Wood, S. H.
PY - 1981/1/1
Y1 - 1981/1/1
N2 - During each of the magmatic eruptions of Mount St. Helens on May 25, June 12, July 22, and August 7, a vertical eruptive column rose intermittently to altitudes of 12-15km, from which pumice, lithic fragments, and crystals settled downwind in lobes that generally become thinner and finer away from the volcano. Each ejecta lobe is asymmetric according to several criteria, including 1) the axes of maximum thickness and of maximum pumice size are not midway between the two margins of the lobe; 2) the axis of maximum pumice size does not correspond to the axis of thickness; and 3) the median size of particles grades through several grain-size intervals from one lateral margin to the other.-from Authors
AB - During each of the magmatic eruptions of Mount St. Helens on May 25, June 12, July 22, and August 7, a vertical eruptive column rose intermittently to altitudes of 12-15km, from which pumice, lithic fragments, and crystals settled downwind in lobes that generally become thinner and finer away from the volcano. Each ejecta lobe is asymmetric according to several criteria, including 1) the axes of maximum thickness and of maximum pumice size are not midway between the two margins of the lobe; 2) the axis of maximum pumice size does not correspond to the axis of thickness; and 3) the median size of particles grades through several grain-size intervals from one lateral margin to the other.-from Authors
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M3 - Article
AN - SCOPUS:0019791456
SN - 1044-9612
VL - 1250
SP - 617
EP - 628
JO - U.S. Geological Survey Professional Paper
JF - U.S. Geological Survey Professional Paper
ER -