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Did I need to specify that I meant "rivers that go near Mt. Rainier"? The Duwamish is a different system.
Sandy sediment sounds like ash.
I didn't catch that you meant rivers from Mt. Rainier coming near Seattle.
No, the sandy sediment was definitely from a lahar that flooded the Duwamish system. IIRC, this discovery came out... late 90s, early 00s. The article was saying ultimately we really don't know what could happen, but this discovery showed that it could hit closer to home than originally thought.
Then my first guess is the river flows were different back then. The lower portions of the Puyallup River system (goes to Tacoma) and the Duwamish system get to within a mile of each other in a valley lowland area near Auburn. Rivers shift over the eons.
The Tsumanis will not be affecting Seattle, Vancouver, Portland, or Victoria. However, the earthquake will. Strong chance of extensive to permanent damage on infrastructure underground like pipelines, tunnels, or other infrastructure. Basically anything with glass will see damage as pent-up megathrusts are generally 9.0 magnitude or higher and can break those easily.
The loss of life in the urban centers would be in the high hundreds, fortunately not thousands. However along the Pacific Coast it could be in the thousands. Structural damage would be more extensive than the loss of lives, however. The tremors, spiked by S-Waves from the rupture would go on for 5-8 minutes and will knock down weakly built structures. Landslides and mudslides possible in areas right along mountainsides.
Had a longer post on this but I deleted it only to summarizing it up in a more condensed synopsis.
The Tsumanis will not be affecting Seattle, Vancouver, Portland, or Victoria. However, the earthquake will. Strong chance of extensive to permanent damage on infrastructure underground like pipelines, tunnels, or other infrastructure. Basically anything with glass will see damage as pent-up megathrusts are generally 9.0 magnitude or higher and can break those easily.
The loss of life in the urban centers would be in the high hundreds, fortunately not thousands. However along the Pacific Coast it could be in the thousands. Structural damage would be more extensive than the loss of lives, however. The tremors, spiked by S-Waves from the rupture would go on for 5-8 minutes and will knock down weakly built structures. Landslides and mudslides possible in areas right along mountainsides.
Had a longer post on this but I deleted it only to summarizing it up in a more condensed synopsis.
Some of that is true. The loss of life estimate matches common thought.
Tunnels will typically do way better than bridges, except where there's a sharp fault line. They're built with some flex, and that's what they do. In LA, SF, Kyoto, etc., viaducts fall down but tunnels tend to be largely undamaged. Same with Seattle's tunnels...we had the century-old Downtown heavy rail tunnel, the I-90 tunnel, the shorter SR 99 highway tunnel, the airport rail tunnels, and others do fine during the 2001 earthquake, and of course all the new ones (Downtown Transit Tunnel, light rail extensions, replacement SR 99 tunnel, etc.) are also built with earthquakes in mind.
Then my first guess is the river flows were different back then. The lower portions of the Puyallup River system (goes to Tacoma) and the Duwamish system get to within a mile of each other in a valley lowland area near Auburn. Rivers shift over the eons.
"Before 1906, the White River joined the Green River near Auburn, and the combined river (under the name "White") joined the Black River at Tukwila, forming the Duwamish River, which emptied into Elliott Bay at Seattle. In 1906, a great flood coupled with a large log and debris jam diverted the White River southward into the Stuck River thence into the Puyallup River, which empties into Commencement Bay at Tacoma. The debris dam was replaced with a permanent diversion wall. Thus the White River remains a tributary of the Puyallup River today." https://en.wikipedia.org/wiki/White_..._modifications
Then my first guess is the river flows were different back then. The lower portions of the Puyallup River system (goes to Tacoma) and the Duwamish system get to within a mile of each other in a valley lowland area near Auburn. Rivers shift over the eons.
It's not so much the rivers and its flow that are the issue, but the valleys.
In the article, it's not even as optimistic as you're being about Mt. Rainier's effects on Seattle. It's definitely going to be bigger than some "serious cleaning" of wiping the ashes off the windows and everything.
Atlanta is sitting pretty in regards to natural disasters. The only things that I can think of are flooding (which the Seattle area could get), severe thunderstorms (extremely rare in Seattle) and tornadoes (also extremely rare in the Seattle area, though one hitting by Puyallup was very surprising). Those are much easier to basically dust off. Not so much with earthquakes and the eruption of Mt. Rainier. Seattle has the "Seattle Process" to deal with, I mean 10 years to decide what to do with the Viaduct?
Yeah, Seattle sucks.... Denver or Boise might be on the same level with this dead zone of box stores and ludicrous cost of living. ATL or almost anywhere for this economic migrant to the lifeless corpse of the PNW, Seattle.
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