HR: 0800h
AN: V11B-1420    [Abstracts]
TI: Strombolian thermodynamics from FLIR imagery: New insights on explosive styles and source conditions
AU: * Patrick, M
EM: patrick@higp.hawaii.edu
AF: Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science Technology, University of Hawaii Manoa, 1680 East-West Road, Honolulu, HI 96822 United States
AU: * Patrick, M
EM: patrick@higp.hawaii.edu
AF: Department of Earth Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA United Kingdom
AU: Harris, A
EM: harris@higp.hawaii.edu
AF: Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science Technology, University of Hawaii Manoa, 1680 East-West Road, Honolulu, HI 96822 United States
AU: Ripepe, M
EM: mripepe@steno.geo.unifi.it
AF: Dipartimento di Scienze della Terra, Universita di Firenze, Via G. La Pira,4, Firenze, I-50121 Italy
AU: Dehn, J
EM: jdehn@gi.alaska.edu
AF: Alaska Volcano Observatory, Geophysical Institute, University of Alaska Fairbanks, 903 Koyukuk Drive, Fairbanks, AK 99775 United States
AU: Rothery, D
EM: D.A.Rothery@open.ac.uk
AF: Department of Earth Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA United Kingdom
AB: We use temperature-calibrated thermal video to constrain the physical characteristics and dynamics of Strombolian eruptions. To do this, we utilize data from a Forward Looking Infrared Radiometer (FLIR) camera, operating at up to 30 Hz. 344 eruptive events at Stromboli volcano, Italy, were imaged during four field seasons spanning four years. We record a wide range of eruptive styles at Stromboli, something hitherto undocumented in the literature because of the small data sets used by previous imaging studies. Eruptions at Stromboli can generally be classified into two groups: Type 1 eruptions, which consist of spatter and an ash-poor gas plume, and Type 2 eruptions, which consist of an optically-thick, ash-rich plume, with (Type 2a) or without (Type 2b) additional spatter. This ash content relates to changes in the thermodynamics of the eruption, such as velocity, pressure, and thermal history. Because of this influence, the time-varying eruption style has ramifications for interpreting data from monitoring systems, including infrared spot-radiometry and infrasound. As a given eruption style (Type 1 vs. Type 2) is often sustained for days to weeks, the variations in these eruptive parameters, on these time scales, can relate to changes in eruptive behavior.
DE: 8414 Eruption mechanisms
DE: 8419 Eruption monitoring (7280)
DE: 8494 Instruments and techniques
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2004 AGU Fall Meeting