HR: 13:55h
AN: V52C-02    [PDF]
TI: FLIR Thermography and Heat/Mass Budgets Bounding the 2002-2003 Effusive Period at Stromboli Volcano
AU: * Patrick, M
EM: patrick@higp.hawaii.edu
AF: Hawaii Institute of Geophysics and Planetology, University of Hawaii Manoa, 1680 East West Road, Honolulu, HI 96816 United States
AU: Harris, A
EM: harris@higp.hawaii.edu
AF: Hawaii Institute of Geophysics and Planetology, University of Hawaii Manoa, 1680 East West Road, Honolulu, HI 96816 United States
AU: Dehn, J
EM: jdehn@gi.alalaska.edu
AF: Alaska Volcano Observatory, University of Alaska Fairbanks, 903 Koyukuk Drive, Fairbanks, AK 99775 United States
AU: Ripepe, M
EM: mripepe@geo.unifi.it
AF: Dipartimento di Scienze della Terra, Universita di Firenze, Via G. La Pira,4, Firenze, I-50121 Italy
AU: Calvari, S
EM: calvari@ct.ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia, Piazza Roma 2, Catania, 95123 Italy
AB: The remarkably consistent behavior of Stromboli Volcano, involving small intermittent explosive events, abruptly shifted to lava effusion from December 2002 to July 2003. Encompassing periods before, during and after the months of effusion we used a hand-held FLIR (Forward Looking Infrared Radiometer) camera to characterize heat loss from the volcanic vent system. We present new methods to estimate mass and heat flux of explosive events, as well as radiative and convective heat losses from the summit vents, using the FLIR imagery and image processing techniques. These results complement data from previous studies to comprise a comprehensive heat and mass budget covering the period around the 2002-2003 effusive stage. The pre-effusive heat flux totaled 420 MW, while the co-effusive value reached about 2100 MW, equating to an approximate increase in heat loss by a factor of five. Pre-effusive eruptive mass flux averaged about 150 kg/s, while the co-effusive value was about 1450 kg/s, meaning an increase in mass output by approximately a factor of ten. The eruptive mass output during the effusive period is roughly equivalent to the inferred subsurface magma flux (approx. 1350 kg/s) feeding the shallow system, which remained relatively constant throughout the pre and co-effusive stages according to gas flux measurements from other studies. Unlike the pre-effusive period when only a small portion of this magma influx was erupted, the effusive stage exhibited a balance between the subsurface influx and the erupted output. These observations suggest that the magma system at Stromboli remained unchanged at depth, and the effusive episode was simply a function of processes in the shallow conduit.
DE: 5418 Heat flow
DE: 8414 Eruption mechanisms
DE: 8419 Eruption monitoring (7280)
DE: 8434 Magma migration
DE: 8494 Instruments and techniques
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2003 Fall Meeting