Explosive Volcanic Eruptions—III. Plinian Eruption Columns

Wilson, L. (1976) Explosive Volcanic Eruptions—III. Plinian Eruption Columns. Geophysical Journal of the Royal Astronomical Society, 45 (3). pp. 543-556. ISSN 0016-8009

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Abstract

The mechanisms controlling the transport of pyroclasts in a plinian‐type eruption column are discussed. An estimate is made of the density of the magmatic gas in the vent, and initial (‘muzzle’) velocities are deduced for 18 eruptions using the a real distribution of pyroclasts in the resulting air‐fall deposits. A model of the physical properties of the lower part of an eruption column is presented, and used to deduce the heights to which plinian eruption columns should commonly extend. It is demonstrated that column collapse to form ignimbrites may be a common result of the change, with time, of the volatile content of the erupted material as progressively deeper levels in a magma chamber are tapped. Vent radii are estimated for those eruptions for which the duration of the eruption is known.

Item Type:
Journal Article
Journal or Publication Title:
Geophysical Journal of the Royal Astronomical Society
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1908
Subjects:
ID Code:
149056
Deposited By:
Deposited On:
16 Nov 2020 10:45
Refereed?:
Yes
Published?:
Published
Last Modified:
23 Nov 2020 14:56