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Lightning and Electrical Activity during the 2006 Eruption of Augustine Volcano

Professional Paper 1769-25

Chapter 25 of Power, J.A., Coombs, M.L., and Freymueller, J.T., eds., The 2006 eruption of Augustine Volcano, Alaska
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Abstract

Lightning and other electrical activity were measured during the 2006 eruption of Augustine Volcano. We found two phases of the activity, the explosive phase corresponding to the explosive eruptions and the plume phase. We classified the lightning into three types, vent discharges, near-vent lightning, and plume lightning. Vent discharges are small, 10 to 100 m sparks, that occur at rate as great as 10,000 s-1 at the mouth of the volcano during the energetic explosive eruptions. The vent discharges were observed six different times. Near-vent lightning appears to develop upward from the volcanic cone into the developing column during explosions. This lightning is small, in the range of 1 to 7 km, and short, 0.01 to 0.1 s. The behavior of the near-vent lightning indicates an overall positive charge in the ejecta. The plume lightning resembled intracloud thunderstorm lightning. Often it was branched, spanned more than 10 km, and lasted more than 0.5 s.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Lightning and Electrical Activity during the 2006 Eruption of Augustine Volcano
Series title:
Professional Paper
Series number:
1769-25
Edition:
-
Year Published:
2010
Language:
ENGLISH
Publisher:
U.S. Geological Survey
Contributing office(s):
Alaska Volcano Observatory
Description:
30 p.; p. 579-608
Online Only (Y/N):
Y
Additional Online Files(Y/N):
N