Interesting info about the slide that posits a quake at Mt. could have triggered the slide, not a subduction zone quake.
https://katu.com/news/local/new-researc ... gods-slide
New study on the Bonneville landslide
- Don Nelsen
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New study on the Bonneville landslide
"Everything works in the planning stage" - Kelly
"If you don't do it this year, you will be one year older when you do" - Warren Miller
"If you don't do it this year, you will be one year older when you do" - Warren Miller
- adamschneider
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Re: New study on the Bonneville landslide
Wow, that article is way better (and more detailed) than I'd expect from a TV news station.
- retired jerry
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Re: New study on the Bonneville landslide
yeah, really. TV news usually just has some superficial stuff with some details wrong, like the name of a creek or mountain. That article is pretty good.
Has anyone seen the Gate Creek fault? Four to five feet high - that should be pretty easy
It looks like the fault goes through the south defiance trailhead and the wyeth trail crosses the fault
Has anyone seen the Gate Creek fault? Four to five feet high - that should be pretty easy
It looks like the fault goes through the south defiance trailhead and the wyeth trail crosses the fault
Re: New study on the Bonneville landslide
I had always thought that the slide that created the temporary bridge was dated to the 1700s. In our climate I didn't think that those trees would last that long, they should decompose before centuries go by. But this article says the slide is dated to t he 1400s.
Re: New study on the Bonneville landslide
The natural agents that promote decay of woody material are not present underwater (lack of oxygen). Much of the city of Venice sits atop alder and oak pilings that are at least as old as the Bonneville drowned trees.
Re: New study on the Bonneville landslide
Why do you think there is no oxygen underwater? I found this online:
.Rivers and streams tend to stay near or slightly above 100% air saturation due to relatively large surface areas, aeration from rapids, and groundwater discharge, which means that their dissolved oxygen concentrations will depend on the water temperature ¹
So maybe the dams have resulted in calm water that limits oxygen levels, but they are very recent in comparison to this event. I certainly have read of cases of sunken wooden boats surviving a long time in cold and deep water.
Re: New study on the Bonneville landslide
No oxygen for the fungi that break down the cellular material. When wood is submerged, all of the air it contains is expelled.
- Don Nelsen
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Re: New study on the Bonneville landslide
I've kayaked on Clear Lake off of Hwy 26 south of Santiam Pass. It's amazing to see the trees sticking up from the bottom knowing they were inundated when the lake formed about 3000 years ago. Granted, clear lake has exceptionally pure water and is always cold, but, still, 3000 years and still not rotted away!
https://www.onlyinyourstate.com/oregon/ ... st-oregon/
dn
"Everything works in the planning stage" - Kelly
"If you don't do it this year, you will be one year older when you do" - Warren Miller
"If you don't do it this year, you will be one year older when you do" - Warren Miller
- retired jerry
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Re: New study on the Bonneville landslide
That's like Spirit Lake pre eruption
The bottom was covered with big trees from the previous eruption
The water was pretty clean and cold
The bottom was covered with big trees from the previous eruption
The water was pretty clean and cold