Cooling rate of an active Hawaiian lava flow from nighttime spectroradiometer measurements

Details Cooling rate of an active Hawaiian lava flow from nighttime spectroradiometer measurements Cooling rate of an active Hawaiian lava flow from nighttime spectroradiometer measurements

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1783f&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 17, Sept. 4, 1992, p. 1783-1786.

Physics

26

Cooling, Flow Distribution, Lava, Satellite Observation, Spectroradiometers, Volcanoes, Earth Crust, Hawaii, Mathematical Models, Spectral Resolution

Scientific paper

A narrow-band spectroradiometer has been used to make nighttime measurements of the Phase 50 eruption of Pu'u O'o, on the East Rift Zone of Kilauea Volcano, Hawaii. On February 19, 1992, a GER spectroradiometer was used to determine the cooling rate of an active lava flow. This instrument collects 12-bit data between 0.35 to 3.0 microns at a spectral resolution of 1-5 nm. Thirteen spectra of a single area on a pahoehoe flow field were collected over a 59 minute period (21:27-22:26 HST) from which the cooling of the lava surface has been investigated. A two-component thermal mixing model (Flynn, 1992) applied to data for the flow immediately on emplacement gave a best-fit crustal temperature of 768 C, a hot component at 1150 C, and a hot radiating area of 3.6 percent of the total area. Over a 52-minute period (within the time interval between flow resurfacings) the lava flow crust cooled by 358 to 410 C at a rate that was as high as 15 C/min. The observations have significance both for satellite observations of active volcanoes and for numerical models of the cooling of lava flows during their emplacement.

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