Sunday, July 31, 2005

A Spectacular outburst on Mount St Helens

There were two stronger tremors last night at Mount St Helens, one of which caused a spectacular outburst from the crater.

The first, at 23:09 was a M3.0 tremor that also caused a small outburst from the lavadome. The second occurred at 02:24 and was slightly stronger at M3.3 - but this tremor was associated with a spectacular outburst from the lavadome.

The USGS are this morning reporting that, Another large section of the spine at the north end of the growing lava dome collapsed overnight in a rockfall. An M=3.3 earthquake at about 2:34 a.m. this morning was the likely trigger.

2 Comments:

Anonymous Cathy said...

Did you see the plume that went up when there was a spine collapse yesterday? It went above the rim. I'm still concerned about the rim (upper left of the image) that is almost directly above the first anomalous glow. That particular area a really huffing and puffing. Is that a vent or just an area where rockfalls continue to occur?

2005-07-31, 12:50 PM  
Blogger Daz said...

G'day Cathy,

Yes, I did see that, but I think we are seeing dust kicked up by rock slides in the crater - there no signs in the night time images of any hotspots in those areas where we keep seing plumes during the day. So until we hear from the USGS that there is something happening up there, I'm not too concerned...

2005-07-31, 1:24 PM  

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