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Thermal property measurements in a fresh pumice flow at Mt. St. Helens
Author(s) -
Hardee H. C.
Publication year - 1981
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl008i003p00210
Subject(s) - pumice , thermal diffusivity , thermal conductivity , geology , mineralogy , heat flow , thermal , volcano , materials science , meteorology , composite material , geochemistry , thermodynamics , physics
A thermal penetrator that was air dropped into a freshly emplaced pumice flow at Mt. St. Helens yielded information on the in‐situ thermal properties of the pumice. The in‐situ conductivity‐density‐specific heat product at a depth of 60 cm was found to be 7.24 × 10 −5 cal²/cm 4 s − °C² at an average pumice temperature of 200°C. Using this data, values for the average in‐situ thermal conductivity (2.9 × 10 −4 cal/cm − s − °C) and thermal diffusivity (1.2 × 10 −3 cm²/s) were estimated. These thermal properties are of use in studies of pumice cooling and in the interpretation of infrared remote sensing data.