Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/2208| DC Field | Value | Language |
|---|---|---|
| dc.contributor.authorall | Bailey, J. E.; Hawai’i Institute of Geophysics and Planetology, University of Hawai’i at Manoa | en |
| dc.contributor.authorall | Harris, A. J. L.; Hawai’i Institute of Geophysics and Planetology, University of Hawai’i at Manoa | en |
| dc.contributor.authorall | Dehn, J.; Alaska Volcano Observatory/University of Alaska, Fairbanks | en |
| dc.contributor.authorall | Calvari, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia | en |
| dc.contributor.authorall | Rowland, S. K.; Hawai’i Institute of Geophysics and Planetology, University of Hawai’i at Manoa | en |
| dc.date.accessioned | 2007-07-03T07:19:21Z | en |
| dc.date.available | 2007-07-03T07:19:21Z | en |
| dc.date.issued | 2006 | en |
| dc.identifier.uri | http://hdl.handle.net/2122/2208 | en |
| dc.description.abstract | An open channel lava flow on Mt. Etna (Sicily) was observed during May 30–31, 2001. Data collected using a forward looking infrared (FLIR) thermal camera and a Minolta-Land Cyclops 300 thermal infrared thermometer showed that the bulk volume flux of lava flowing in the channel varied greatly over time. Cyclic changes in the channel’s volumetric flow rate occurred over several hours, with cycle durations of 113–190 min, and discharges peaking at 0.7 m3 s−1 and waning to 0.1 m3 s−1. Each cycle was characterized by a relatively short, high-volume flux phase during which a pulse of lava,with awell-defined flow front, would propagate down-channel, followed by a period of waning flow during which volume flux lowered. Pulses involved lava moving at relatively high velocities (up to 0.29 m s−1) and were related to some change in the flow conditions occurring up-channel, possibly at the vent. They implied either a change in the dense rock effusion rate at the source vent and/or cyclic-variation in the vesicle content of the lava changing its bulk volume flux. Pulses would generally overspill the channel to emplace p¯ahoehoe overflows. During periods of waning flow, velocities fell to 0.05 m s–1. Blockages forming during such phases caused lava to back up. Occasionally backup resulted in overflows of slow moving ‘a‘¯a that would advance a few tens of meters down the levee flank. Compound levees were thus a symptom of unsteady flow, where overflow levees were emplaced as relatively fast moving p¯ahoehoe sheets during pulses, and as slow-moving ‘a‘¯a units during backup. Small, localized fluctuations in channel volume flux also occurred on timescales of minutes. Volumes of lava backed up behind blockages that formed at constrictions in the channel. Blockage collapse and/or enhanced flow under/around the blockage would then feed short-lived, wave-like, downchannel surges. Real fluctuations in channel volume flux, due to pulses and surges, can lead to significant errors in effusion rate calculations. | en |
| dc.format.extent | 1750933 bytes | en |
| dc.format.mimetype | application/pdf | en |
| dc.language.iso | English | en |
| dc.publisher.name | Springer-Verlag | en |
| dc.relation.ispartof | Bull Volcanol | en |
| dc.relation.ispartofseries | 6/68 (2006) | en |
| dc.subject | Etna | en |
| dc.subject | FLIR | en |
| dc.subject | Lava channel | en |
| dc.subject | a‘a | en |
| dc.subject | Thermal | en |
| dc.subject | Unsteady flow | en |
| dc.subject | Morphology | en |
| dc.title | The changing morphology of an open lava channel on Mt. Etna | en |
| dc.type | article | en |
| dc.description.status | Published | en |
| dc.type.QualityControl | Peer-reviewed | en |
| dc.description.pagenumber | 497-515 | en |
| dc.subject.INGV | 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring | en |
| dc.identifier.doi | 10.1007/s00445-005-0025-6 | en |
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| dc.description.fulltext | reserved | en |
| dc.contributor.author | Bailey, J. E. | en |
| dc.contributor.author | Harris, A. J. L. | en |
| dc.contributor.author | Dehn, J. | en |
| dc.contributor.author | Calvari, S. | en |
| dc.contributor.author | Rowland, S. K. | en |
| dc.contributor.department | Hawai’i Institute of Geophysics and Planetology, University of Hawai’i at Manoa | en |
| dc.contributor.department | Hawai’i Institute of Geophysics and Planetology, University of Hawai’i at Manoa | en |
| dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OE, Catania, Italia | en |
| dc.contributor.department | Hawai’i Institute of Geophysics and Planetology, University of Hawai’i at Manoa | en |
| item.openairetype | article | - |
| 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.dept | Hawai’i Institute of Geophysics and Planetology, University of Hawai’i at Manoa | - |
| 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: | Article published / in press | |
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