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But the impression I got from the article about Mt. Redoubt is that the geologists really don't know what the probable extent of an eruption at that mountain could be. They have covered what they have already witnessed, and have speculated, but have no definite answers. Which is the scary part. And they have been warning the region to be ready for any possible outcome.
I agree. I skimmed through that article on Mt. Saint Helens, and it is concerning to hear that that volcano had small eruptions prior to the big one....something they apparently observed for Mt. Redoubt. Another thing of particular concern is that you said Alaska is ringed by volcanoes - depending on how large this eruption could be, it may set off a chain reaction. Perhaps by the tremors from the eruption itself - that's got to send huge shockwaves through the lithosphereic plates, and could perhaps force magma to the surface of others. Earthquakes, like you said, may be a possibility.
Something also, but I've got no factual information to back this up, it is merely an observation. The amount of snow in Alaska surely contributes to the amount of snow on the mountains. This could serve as a negative. Due to the possibility of the vaporization of water during the eruption, I wonder if the water vapor could add to the explosive force, propelling the pyroclastic material further than it would have otherwise gone. This is purely hypothetical, I'm just wondering what you might think about this. It seems logical to me, but I could be way off factually.
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I actually saw Dante's Peak. It was a good movie, and that is very interesting that they filmed some of the crater of Mount St. Helens prior to the eruption. I wonder if Mount Redoubt is connected to any other volcanoes via a magma pocket.
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I'd like to draw attention to these two links:
http://www.stowe.k12.vt.us/SHS/teachers/kiefer/escience/eqproject/es7/Jordan-Alaska/Web%20Pages/Plate%20Tectonics_files/image004.gifand
http://www.examiner.com/images/blog/EXID504/slideshows/redoubt%20430%20map.jpgThe first one shows plate movements. I had assumed Alaska was on the Pacific plate, but I was wrong. However, the general location is near the border of the Pacific plate. I'd also like to point out that the Valley of Ten Thousand Smokes appears to run along the Aleutian Trench, I just wonder if seismic tremors from Redoubt, should it erupt, could travel this far...
There also appears to be a volcano below Redoubt, named Iliamna. This volcano appears to have had recent seismic activity too. Here's an article on that:
http://www.gi.alaska.edu/ScienceForum/ASF13/1300.htmlThoughts on a possible connection?