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Bulletin of Volcanology

, Volume 74, Issue 6, pp 1395–1407 | Cite as

Monitoring of the plume from the basaltic phreatomagmatic 2004 Grímsvötn eruption—application of weather radar and comparison with plume models

  • Björn Oddsson
  • Magnús T. Gudmundsson
  • Guðrún Larsen
  • Sigrún Karlsdóttir
Research Article

Abstract

The Grímsvötn eruption in November 2004 belongs to a class of small- to medium-sized phreatomagmatic eruptions which are common in Iceland. The eruption lasted 6 days, but the main phase, producing most of the 0.02 km3 of magma erupted, was visible for 33 h on the C-band weather radar of the Icelandic Meteorological Office located in Keflavík, 260 km to the west of the volcano. The plume rose to 8–12 km high over sea level during 33 h. The long distance between radar and source severely reduces the accuracy of the plume height determinations, causing 3.5-km steps in recorded heights. Moreover, an apparent height overestimate of ~1.5 km in the uncorrected radar records occurs, possibly caused by wave ducting or super-refraction in the atmosphere. The stepping and the height overestimate can be partly overcome by averaging the plume heights and by applying a height adjustment based on direct aircraft measurements. Adjusted weather radar data on plume height are used to estimate the total mass erupted using empirical plume models mostly based on magmatic eruptions and to compare it with detailed in situ measurements of the mass of erupted tephra. The errors arising because of the large radar plume distance limit the applicability of the data for detailed comparisons. However, the results indicate that the models overestimate the mass erupted by a factor of three to four. This supports theoretical models indicating that high steam content of phreatomagmatic (wet) plumes enhances their height compared to dry plumes.

Keywords

Explosive eruptions Magma discharge Plume models Iceland 

Notes

Acknowledgments

The field work was done with the support of the Iceland Glaciological Society. Hálfdán Ágústsson, Katrín Auðunardóttir, Hrafnhildur Hannesdóttir and Snævarr Guðmundsson helped in the field, and Þorsteinn Jónsson gave technical support. Sverrir Guðmundsson helped with Matlab programming. Philippe Crochet is acknowledged for providing the Vertical Refractivity Gradient estimates and some useful comments to the paper. Peter Webley and an anonymous reviewer are thanked for their contribution. The project was funded by the Icelandic Research Fund and Landsvirkjun.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Björn Oddsson
    • 1
  • Magnús T. Gudmundsson
    • 1
  • Guðrún Larsen
    • 1
  • Sigrún Karlsdóttir
    • 2
  1. 1.Institute of Earth SciencesUniversity of IcelandReykjavíkIceland
  2. 2.Icelandic Meteorological OfficeReykjavíkIceland

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