Thermal property measurements in a fresh pumice flow at Mt. St. Helens

Details Thermal property measurements in a fresh pumice flow at Mt. St. Helens Thermal property measurements in a fresh pumice flow at Mt. St. Helens

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..210h&link_type=abstract

Geophysical Research Letters, vol. 8, Mar. 1981, p. 210-212.

Physics

1

Effusives, Pumice, Telemetry, Temperature Gradients, Thermodynamic Properties, Volcanoes, Cooling, Specific Heat, Thermal Conductivity, Thermal Diffusivity

Scientific paper

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 x 10 to the -5th cal-squared/cm to the 4th-s-C-squared at an average pumice temperature of 200 C. Using this data, values for the average in situ thermal conductivity (0.00029 cal/cm-s-C) and thermal diffusivity (0.0012 sq cm/s) were estimated. These thermal properties are of use in studies of pumice cooling and in the interpretation of infrared remote sensing data.

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