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Measurements of the cooling at the base of Pahoehoe Flows

Measurements of the cooling at the base of Pahoehoe Flows Temperature measurements were made in August and October of 1994 at the base of small active pahoehoe flow lobes on Kilauea Volcano, Hawai'i. Surprisingly, after about 2 minutes of initial rapid cooling, the basal temperatures increased significantly before resuming a slower cooling trend. The recorded temperatures are also warmer than those predicted by simple conductive cooling models. Preliminary calculations suggest that these observations can be explained by the insulating effect of microfractures in the underlying flow and the kinetics of crystallization. The initial cooling may be rapid enough to super‐cool the lava such that the onset of crystallization is delayed. When crystallization does begin, it is initially rapid, releasing sufficient latent heat to re‐heat the lava. As the system equilibrates, the flow resumes a slow cooling. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geophysical Research Letters Wiley

Measurements of the cooling at the base of Pahoehoe Flows

Keszthelyi, Laszlo
Geophysical Research Letters , Volume 22 (16) – Aug 15, 1995
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References (9)

Publisher
Wiley
Copyright
Copyright © 1995 by the American Geophysical Union.
ISSN
0094-8276
eISSN
1944-8007
DOI
10.1029/95GL01812
Publisher site
See Article on Publisher Site

Abstract

Temperature measurements were made in August and October of 1994 at the base of small active pahoehoe flow lobes on Kilauea Volcano, Hawai'i. Surprisingly, after about 2 minutes of initial rapid cooling, the basal temperatures increased significantly before resuming a slower cooling trend. The recorded temperatures are also warmer than those predicted by simple conductive cooling models. Preliminary calculations suggest that these observations can be explained by the insulating effect of microfractures in the underlying flow and the kinetics of crystallization. The initial cooling may be rapid enough to super‐cool the lava such that the onset of crystallization is delayed. When crystallization does begin, it is initially rapid, releasing sufficient latent heat to re‐heat the lava. As the system equilibrates, the flow resumes a slow cooling.

Journal

Geophysical Research Letters – Wiley

Published: Aug 15, 1995

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