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Another look at the calculation of fallout tephra volumes

Bulletin of Volcanology

By:
,
DOI: 10.1007/BF00278005

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Abstract

The calculation of volumes of fallout tephra layers is difficult because of the nonlinear dependence of thickness on area and because of the extrapolations required at the vent and in distal regions. Calculation using the trapezoidal rule, straight lines on log-log plots of area versus thickness, straight lines on plots of log thickness versus area1/2, and the crystal-concentration method are reviewed and the problems with each method discussed. The method using straight lines on plots of log thickness versus area1/2 is the most geologically reasonable because most deposits thin exponentially from source and therefore plot as straight lines using these coordinates. Errors and uncertainties in previous derivations for using this method are discussed and more general formulas presented. The method is also used to gain perspective on the "missing" distal volumes calculated by the crystal-concentration method compared to those calculated based only on isopach data. ?? 1992 Springer-Verlag.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Another look at the calculation of fallout tephra volumes
Series title:
Bulletin of Volcanology
DOI:
10.1007/BF00278005
Volume
54
Issue:
2
Year Published:
1992
Language:
English
Publisher location:
Springer-Verlag
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Bulletin of Volcanology
First page:
156
Last page:
167
Number of Pages:
12