March 22, 2009 11:02 PM AKDT
Start of event: March 23, 2009 07:02 UTC
(March 22, 2009 11:02 PM AKDT)
Lightning Mapping Data
An animation of the lightning sequence:
This is the first explosion that showed major electrical activity.
Plume heights of 15.2 km were recorded for this event.
There was 20.6 minutes of electrical activity, which began with amorphous and seemingly
random discharges focussed over the vent. This type of activity persists for at least 2
minutes. The activity gradually shifted to small, discrete discharges, which became larger and more
structured over time.
Clam Gulch Station