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Minimum volume of a tephra fallout deposit estimated from a single isopach

Authors
Journal
Journal of Volcanology and Geothermal Research
0377-0273
Publisher
Elsevier
Publication Date
Volume
96
Identifiers
DOI: 10.1016/s0377-0273(99)00135-3

Abstract

Abstract A simple method is presented to calculate the minimum volume of an exponentially-thinning fall deposit for which only one isopach is available. This method exploits the fact that the product of the area enclosed within an isopach ( A) and its thickness ( T) reaches a maximum value ( TA) max for a certain isopach. It is shown that the minimum volume is V min=3.69 TA, which is equal to the actual volume when TA=( TA) max. Calculation of V min for 327 isopachs from 74 fallout deposits shows that it is often just a bit lower than the volume calculated from all the available isopachs. It is therefore proposed that V min provides a useful minimum volume estimate for fallout deposits for which only one isopach is available.

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