HR: 0830h
AN: V51F-0333    [PDF]
TI: Lava extrusion rates from handheld infrared imagery
AU: * Dehn, J
EM: jdehn@gi.alaska.edu
AF: Alaska Volcano Observatory, Geophysical Institute University of Alaska Fairbanks, Fairbanks, AK 99775 United States
AU: Harris, A J
EM: harris@higp.hawaii.edu
AF: HIGP/SOEST, University of Hawai'i 2525 Correa Rd., Honolulu, HI 96822 United States
AU: Patrick, M R
EM: patrick@higp.hawaii.edu
AF: HIGP/SOEST, University of Hawai'i 2525 Correa Rd., Honolulu, HI 96822 United States
AU: Calvari, S
EM: calvari@ct.ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia, Piazza Roma 2, Catania, 95123 Italy
AU: Lodato, L
EM: lodato@ct.ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia, Piazza Roma 2, Catania, 95123 Italy
AU: Ripepe, M
EM: maurizio@ibogfs.df.unibo.it
AF: Department of Earth Science, University of Florence Via G. La Pira 4, Florence, 50121 Italy
AB: During the extrusive phase of the ongoing eruption at Stromboli in the early part of 2003, the development of an a\'{}a lava flow down the steep slope of the Sciara del Fuoco provided an ideal opportunity to use infrared imagery to estimate lava effusion rates. The method for extrusion rate calculation follows that used in satellite imagery, setting constant values for the conductive and convective heat loss, as well as the latent heat of fusion. The radiative component is measured using the FLIR (forward looking infrared radiometer) images. Measurements were made with a FLIR systems Thermacam 595 and 695, accuracy between instruments fell to within 10%. Using this method, effusion rates raging from 0.1 to 0.6 m$^{3}$/s were measured, with an error of about 0.1 m$^{3}$/s. These rates are typical of the magma supply to Stromboli, suggesting an open steady system, and that though the surface expression of the volcanism had changed, the deep system remained unchanged. When effusion rates waned, an increase in the temperatures recorded at the summit craters was observed. Conversely, an increase in effusion rate would result in a decrease of summit crater temperature. This inverse cycle would hold for about one week, then a cycle where the rates and temperatures increased and decreased together would occur, followed again by the inverse cycle. Though it is unclear what this means about the shallow conduit geometry, it is clear that the vents are linked. The use of handheld infrared imagery has become a useful tool to monitor and mitigate volcanic hazards, and will continue to supply rapid useful data about eruptions at eruptions worldwide.
UR: http://flir.images.alaska.edu
DE: 8414 Eruption mechanisms
DE: 8419 Eruption monitoring (7280)
DE: 8494 Instruments and techniques
DE: 8499 General or miscellaneous
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2003 Fall Meeting