Author Topic: 1 in 3 chance Northwest US can have major quake.  (Read 2053 times)

Suu

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Re: 1 in 3 chance Northwest US can have major quake.
« Reply #30 on: July 26, 2010, 03:08:07 pm »
Yeah, but Rainier isn't small. I would assume damage to Seattle would be imminent as well. Then again, Mt. St. Helens blew practically around the corner from Portland, and nobody heard a thing.

Well, most projections show the mudflows being contained on the north by the Duwamish river, thus sparing Seattle proper from major damage, but those same projections show that 700,000+ people (and this was years ago, it's probably alot more now) would have less than an hour to evacuate.

The one I'd be worried about (especially if I had an apartment in PDX that was only 10 blocks away, which I do) is Mt. Tabor, which is the only active volcano inside the city limits of a major American city.

I thought Tabor was extinct?  :? All of the sources I'm finding says it a Plio-Pleistocene cinder cone, like the cones we have over here in the Northeast.
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Mesozoic Mister Nigel

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Re: 1 in 3 chance Northwest US can have major quake.
« Reply #31 on: July 26, 2010, 09:37:12 pm »
Yeah, like Rocky Butte and Powell Butte, Tabor's on the Boring Lava Field, which is extinct, in the sense that the lava tubes that fed it are blocked and cold. However, some geologists think this whole region is sitting on either a steam or lava bed (there's some kind of research underway to try to figure out which) of unfathomable size.
“I’m guessing it was January 2007, a meeting in Bethesda, we got a bag of bees and just started smashing them on the desk,” Charles Wick said. “It was very complicated.”


Suu

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Re:
« Reply #32 on: July 26, 2010, 10:15:57 pm »
It would make sense. Magma feeding St. Helens et al is somewhere under there.
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