Sunday, July 30, 2006

Large outburst from Mt St Helens

Despite the cloud cover of the last few days, there was a large and bright outburst from the crater last night just after midnight. The event didn't correspond to any seismic event (see for e.g. Yellow Rock seismic recorder) and it was so large as to briefly illuminate the entire crater.
The stacked image above shows all of the frames from last night combined onto a single image (and superimposed on an image of the mountain to provide reference). The full animation of the event is posted on

Thursday, July 20, 2006

Mount St helens lights up like a Xmas tree

Last night there were mutliple hotspots on the lavadome - as evidenced by the above image which combines all of the hotspots seen during the night into one image. Animations of the show last night are posted on

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.

Tuesday, July 11, 2006

When the moon hits your eye...

Well the moon didn't hit anyone's eye last night (that I know of), but it did arc across the view of the Volcanocam viewing the crater on Mount St Helens last night. It was the first view of the lavadome for several days and the crater was quite active with numerous small rockfalls occurring during the night. The image above shows the moon on the left side of the frame and the active glow from the lavadome in the crater. An animation of the show are available on

Saturday, July 01, 2006

A large outburst from Mount St Helens last night!

After weeks of cloudy weather, then clear weather with little activity, Mount St Helens burst back into the spotlight with a large outburst of activity at 11:30 pm (PST) last night. The event corresponded with a magnitude 3.3 tremor centered on the crater and probably indicates a sizeable section of the lavadome has collapsed. The full details including animations of the outburst are available on

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