Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/3095
DC Field | Value | Language |
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dc.contributor.authorall | Harris, A. J. L.; Hawaii Institute of Geophysics and Planetology | en |
dc.contributor.authorall | Bailey, J.; Hawaii Institute of Geophysics and Planetology | en |
dc.contributor.authorall | Calvari, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia | en |
dc.contributor.authorall | Dehn, J.; Alaska Volcano Observatory, Geophysical Institute | en |
dc.date.accessioned | 2007-12-12T13:00:48Z | en |
dc.date.available | 2007-12-12T13:00:48Z | en |
dc.date.issued | 2005 | en |
dc.identifier.uri | http://hdl.handle.net/2122/3095 | en |
dc.description.abstract | During May 2001 we acquired 2016 thermal images over an ~8-h-long period for a section of active lava channel on Mount Etna (Italy). We used these to extract surface temperature and heat-loss profi les and thereby calculate core cooling rates. Flow surface temperatures declined from ~1070 K at the vent to ~930 K at 70 m. Heat losses were dominated by radiation (5 × 104 W m2) and convection (~104 W/m2). These compare with a heat gain from crystallization of 6 × 103 W/m2. The imbalance between sinks and sources gives core cooling (δT/δx) of ~110 K/km. However, cooling rate per unit distance also depends on fl ow conditions, where we distinguished: (1) unimpeded, high-velocity (~0.2 m/s) fl ow with low δT/δx (0.3 K/m); (2) unimpeded, low-velocity (~0.1 m/s) fl ow with higher δT/δx (0.5 K/m); (3) waning, insulated fl ow at low velocity (~0.1 m/s) with low δT/δx (0.3 K/m); and (4) impeded fl ow at low velocity (<0.1 m/s) with higher δT/δx (0.4 K/m). Our data allow us to defi ne three thermal states of fl ow emplacement: insulated, rapid, and protected. Insulated is promoted by the formation of hanging blockages and coherent roofs. During rapid emplacement, higher velocities suppress cooling rates, and δT/δx can be tied to mean velocity (Vmean) by δT/δx = aVmean –b. In the protected case, deeper, narrow channels present a thermally effi cient channel, where δT/δx can be assessed using the ratio of channel width (w) to depth (d) in w/d = aδT/δx–b. | en |
dc.language.iso | English | en |
dc.publisher.name | Geological Society of America | en |
dc.relation.ispartof | Special Paper 396 | en |
dc.subject | lava channel | en |
dc.subject | Etna | en |
dc.subject | heat loss | en |
dc.subject | cooling | en |
dc.subject | viscosity | en |
dc.subject | velocity | en |
dc.subject | FLIR | en |
dc.title | Heat loss measured at a lava channel and its implications for down-channel cooling and rheology | en |
dc.type | book chapter | en |
dc.description.status | Published | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.description.pagenumber | 125-146 | en |
dc.subject.INGV | 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring | en |
dc.description.obiettivoSpecifico | 1.5. TTC - Sorveglianza dell'attività eruttiva dei vulcani | en |
dc.description.fulltext | reserved | en |
dc.contributor.author | Harris, A. J. L. | en |
dc.contributor.author | Bailey, J. | en |
dc.contributor.author | Calvari, S. | en |
dc.contributor.author | Dehn, J. | en |
dc.contributor.department | Hawaii Institute of Geophysics and Planetology | en |
dc.contributor.department | Hawaii Institute of Geophysics and Planetology | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OE, Catania, Italia | en |
item.openairetype | book chapter | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | restricted | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Hawai’i Institute of Geophysics and Planetology, University of Hawai’i at Manoa | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OE, Catania, Italia | - |
crisitem.author.orcid | 0000-0001-8189-5499 | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
Appears in Collections: | Book chapters |
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Harris et al 2005a.pdf | main article | 843.46 kB | Adobe PDF |
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