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A numerical program for steady-state flow of magma-gas mixtures through vertical eruptive conduits

Open-File Report 2000-209

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Abstract

This report presents a model that calculates flow properties (pressure, vesicularity, and some 35 other parameters) as a function of vertical position within a volcanic conduit during a steady-state eruption. The model idealizes the magma-gas mixture as a single homogeneousfluid and calculates gas exsolution under the assumption of equilibrium conditions. These are the same assumptions on which classic conduit models (e.g. Wilson and Head, 1981) have been based. They are most appropriate when applied to eruptions of rapidly ascending magma (basaltic lava-fountain eruptions, and Plinian or sub-Plinian eruptions of intermediate or silicic magmas) that contains abundant nucleation sites (microlites, for example) for bubble growth.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
A numerical program for steady-state flow of magma-gas mixtures through vertical eruptive conduits
Series title:
Open-File Report
Series number:
2000-209
Edition:
Version 1.0.0 October 2000; Version 1.0.5c November 2013
Year Published:
2000
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Vancouver, WA
Contributing office(s):
Cascades Volcano Observatory, Volcano Science Center
Description:
Report: viii, 53 p.; Visual program description; Readme file; Executable program for Windows 95/98/NT/XP; Fortran source code
Additional Online Files(Y/N):
Y