Wednesday, July 19, 2006

Mount St Helens shakes with largest tremor in 2 years

Yesterday morning at 9:55am (local time) a Magnitude 3.6 quake shook Mount St Helens causing rockfalls and a plume of dust to rise from the crater. This is one of the largest tremors since the current eruption began over two years ago. Last night there was a much smaller tremor at 22:48 (e.g YELL webicorder) which triggered a brief, but bright display from the lavadome. There was no additional visible activity between midnight and sunrise this morning. The USGS has some images and a brief animation of yesterday's event.

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