Proximal air-fall deposits of eruptions (of Mount St. Helens) between May 24 and August 7, 1980 - stratigraphy and field sedimentology.

R. B. Waitt, V. L. Hansen, A. M. Sarna-Wojcicki, S. H. Wood

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

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

Original languageEnglish (US)
Pages (from-to)617-628
Number of pages12
JournalU.S. Geological Survey Professional Paper
Volume1250
StatePublished - Jan 1 1981

Fingerprint Dive into the research topics of 'Proximal air-fall deposits of eruptions (of Mount St. Helens) between May 24 and August 7, 1980 - stratigraphy and field sedimentology.'. Together they form a unique fingerprint.

Cite this