March 23, 2009 04:31 AM AKDT


Start of event: March 23, 2009 12:31 UTC
(March 23, 2009 04:31 AM AKDT)

Lightning Mapping Data

An animation of the lightning sequence:

This explosion was very intense, with plume heights up to 18.3 km. Electrical activity occurred for 53.4 minutes. The first discharges from this explosion were discrete, and located over the volcano. After about 1.5-2 minutes of low frequency discrete activity, the lightning transitions to an intense phase of mostly amorphous activity. Overall, this structureless activity was not localized to the vent alone. It also occurred to the north of the volcano in an area of at least 5 km in radius. Just like the prior explosions, the lightning becomes more structured and discrete over time.

Clam Gulch Station

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