Landslide Nightmares

[Dantheman]

Yeah, PNW will never be the same after Cascadia goes. Seattle and Portland will be a top-shelf dystopian hellscapes.

[Meathelmet]

Been a geobuff all my life (at some point almost started studying geology..) so good reading here.

Few years back went from Calgary to Fernie and saw the Frank slide. Was really mind boggling to see it live.
One of the "does not compute" moments. Impressive.

But, as always at TGR, stepping up a bit :

The "potential" Canary Islands tsunami : https://en.wikipedia.org/wiki/Cumbre_Vieja
Over hyped, probably, but certainly would make a mess.

Or back in the days when even Iceman was young : https://en.wikipedia.org/wiki/Zanclean_flood (ok, that is not a landslide. but lot of shit happened.)

[KQ]

Or back in the days when even Iceman was young : https://en.wikipedia.org/wiki/Zanclean_flood (ok, that is not a landslide. but lot of shit happened.)

You wanna talk floods? This is why eastern Washington has such fertile soil for growing crops.



Missoula Floods








The Missoula Floods (also known as the Spokane Floods or the Bretz Floods) refer to the cataclysmic floods that swept periodically across eastern Washington and down the Columbia River Gorge at the end of the last ice age. The glacial flood events have been researched since the 1920s. These glacial lake outburst floods were the result of periodic sudden ruptures of the ice dam on the Clark Fork River that created Glacial Lake Missoula. After each ice dam rupture, the waters of the lake would rush down the Clark Fork and the Columbia River, flooding much of eastern Washington and the Willamette Valley in western Oregon. After the rupture, the ice would reform, creating Glacial Lake Missoula again.

During the last deglaciation that followed the end of the Last Glacial Maximum, geologists estimate that a cycle of flooding and reformation of the lake lasted an average of 55 years and that the floods occurred several times over the 2,000-year period between 15,000 and 13,000 years ago. U.S. Geological Survey hydrologist Jim O'Connor and Spanish Center of Environmental Studies scientist Gerard Benito have found evidence of at least twenty-five massive floods, the largest discharging ≈10 cubic kilometers per hour (2.7 million m³/s, 13 times the Amazon River).[2] Alternate estimates for the peak flow rate of the largest flood include 17 cubic kilometers per hour[3] and range up to 60 cubic kilometers per hour.[4] The maximum flow speed approached 36 meters/second (130 km/h or 80 mph).[3]

Within the Columbia Basin, detailed investigation of the Missoula floods' glaciofluvial deposits, informally known as the Hanford formation, has documented the presence of Middle and Early Pleistocene Missoula flood deposits within the Othello Channels, Columbia River Gorge, Channeled Scabland, Quincy Basin, Pasco Basin, and the Walla Walla Valley. Based on the presence of multiple interglacial calcretes interbedded with flood deposits, magnetostratigraphy, optically stimulated luminescence dating, and unconformity truncated clastic dikes, it has been estimated that the oldest of the Pleistocene Missoula floods happened before 1.5 million years ago. Because of the fragmentary nature of older glaciofluvial deposits, which have been largely removed by subsequent Missoula floods, within the Hanford formation, the exact number of older Missoula floods, which are known as Ancient Cataclysmic Floods, that occurred during the Pleistocene cannot be estimated with any confidence.[5][6]

[Meadow Skipper]

The phrase Channeled Scablands runs through my mind constantly whenever I've visited E. WA.

[old goat]

https://www.nbcnews.com/business/10-...ers-6c10088195

when it comes to natural disasters, you can run but you can't hide. The one that I'm worried about is climate change.

[LightRanger]

The Missoula jokulhaups/outflows definitely came to mind when it was read this thread yesterday. But didn't mention it because it isn't really a landslide.

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[Norseman]

"It felt like a volcanic erection."

[Marshall Tucker]

when even Iceman was young :

a geomanictic unpossiblity.

[abraham]

Looks like BC had a big one in 2020, great article from the Hakai institute here

Part two of the hazard cascade is sudden, short, and dramatic.

When the landslide slammed into two-kilometer-long Elliot Lake, it was traveling around 170 kilometers per hour⁠. The impact displaced a huge amount of water and kicked up a 100-meter tsunami wave

https://hakai.org/getting-to-know-a-landslide/

[m2711c]

i had heard about this slide, but i had no idea how fuckin' hudge it actually is... dirt slid so damned deep, most of the trees are still standing upright ontop of the debris pile. this is gonna be a big mess when the river finally overtops that pile and starts flowing again.

[m2711c]

[XXX-er]

A guy was camping right at that slide almost got taken and his dog is missing,

you can see some burnt stems so an FF probably destabilized the land

the fish are coming pretty quick and they will have nowhere to go

[east or bust]

See Quake Lake along the Madison, will probably end up very similar to that.


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[apex dave]

A guy was camping right at that slide almost got taken and his dog is missing,

you can see some burnt stems so an FF probably destabilized the land

the fish are coming pretty quick and they will have nowhere to go

The dog is fine and with it's owner

[m2711c]

good. that'd be a really shitty way for a dog to go...

[m2711c]

Lake Chilcotin turning back into teh Chilcotin River…

Didn’t take long to go from this…




Ta this…