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Seattle Earthquake Doom
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[quote:Anonymous Coward 1343684:MV8xNDU4NjEwXzI0MDU5NDM4XzRGMjI5RkY3] [quote:Anonymous Coward 1343684] [quote:LadyLeo] U.S. Fears Mega Thrust Earthquake Tsunami Will Wipe Out North West The Pacific Northwest coast is overdue for a 'mega thrust' earthquake on the Cascadia fault line scientists are warning. When it happens they say it could also trigger a tsunami, Oregon, Seattle and Vancouver (get ready for the big one) coastal areas would be inundated within 15-30 minutes. Get Ready For The Big One http://www.theglobeandmail.com/news/arts/books/cascadias-fault-the-deadly-earthquake-that-will-devastate-north-america-by-jerry-thompson/article1995697/ U.S. fears overdue 'megathrust' earthquake will trigger tsunami and decimate unprepared cities on north-west coast Read more: http://www.dailymail.co.uk/sciencetech/article-1379187/U-S-fears-overdue-megathrust-earthquake-trigger-tsunami-decimate-unprepared-north-west.html#ixzz1KRy1XUf7 US northwest coast overdue for 'megathrust' earthquake on Cascadia fault line http://www.theaustralian.com.au/news/health-science/us-northwest-coast-overdue-for-megathrust-earthquake-on-cascadia-fault-line/story-e6frg8y6-1226042712733:banana2: [/quote] The history did an segment on this area. they claim to evidence that this area is the site of the biggest EQ in the history of the planet some millions of years ago. They also said the Tsunami could be 250 feet high, with the warning time 15 minutes. I have thought for years that either this area, or Long Valley (in my backyard), will be the next to go in the USA. [/quote] Oops, meant the History channel. here are some great graphics on a bookmark I have saved for years. It explains everything. There are also undersea volcano's off the coast of Seattle, which is a wild card in the area. http://www.pnsn.org/HAZARDS/CASCADIA/cascadia_zone.html [/quote]
Original Message
As a resident of the city of Seattle I'm a little concerned about this pending doom.
Off the northwest coast along the Cascadia subduction zone, the Juan de Fuca plate is grinding against and slipping under the North American plate about every 15 months. Whenever it does deep tremors are detected that go on for days or weeks; enough energy that two weeks of these tremors released in the span of ten seconds would equate to a 7.0 earthquake.
There WILL BE a mega-earthquake generated when the conditions are right - it happens every 300 to 500 years. The last time plate slippage went beyond the break zone was 311 years ago, in January of 1700. A mega 9.2 fired off and the resulting tsunami reached Japan.
[
link to pda.physorg.com
]
Researchers at Central Washington have determined that a tectonic shift in Cascadia could send a "shotgun blast" of energy into greater Seattle. The resulting shakes might be stronger than anyone has planned for and "everything from small buildings to skyscrapers would be at risk of collapse."
[
link to blogs.seattleweekly.com
]
The logistical nightmare of getting supplies to 5 million people post-quake.
[
link to www.strategypage.com
]
The ground would move 1.5 feet per second in Seattle.......
.........This is bad news for the North West for two reasons: one, because the combined long-duration shaking and high ground velocities raise the possibility that such an earthquake could inflict major damage on downtown Seattle; and two, areas like Seattle, Tacoma and Olympia sit on top of sediment filled geological basins, thus, AMPLIFYING the waves generated by major earthquakes.“
[
link to www.dailygalaxy.com
]
(1700 foot tsunami in an Alaskan bay!)
I have no doubt the viaduct and many, many buildings including skyscrapers would come tumbling down if this thing went off. And about 15 minutes later would come the tsunami. What form it would take in Puget Sound I don't know, but it wouldn't be good...
YIKES!
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