An annual revisit to a fascinating video! Before the narrow canyon back-filled with levees, the onslaught of debris must have scoured it much deeper. The mobility of this slide is absolutely amazing. It even took the time to sort it's flows. Gravity and liquefaction: Excellent dance partners! Tango? Flamenco? Certainly not a Waltz. Oh, BREAKDANCE!!..... Yeah, that's it. 'Love your vids Bruce~
I'm in WV and used to seeing landslides and some flood features. But, everything out there is so dang huge and it's hard to put the scale in the old noggin. Love these videos, Bruce. Thank you.
great video as usual I would like to thank you for doing these videos My wife unfortunately is unable to travel to these places due to injuries and poor health like she did when younger but still gets to see them through your work whenever she wants on your channel many thanks for that
Thanks, Bruce. Fascinating. Maybe a chinook wind event sliding down off the Cascades suddenly melted feet of snow in hours to provide the water weight and reduction in friction.
Thank you again for this incredible soulful footage and explanations. Appreciate the music, captions and arrows...very helpful as I have not background in geology. I have been trying to educate myself with the free youtube videos on geology but hands down I keep returning to your videos as the most impactful and mesmerizing.
I can see the Rattlesnake Ridge landslide from my house in Union Gap. It has moved several hundred feet in last 3-4 years. It is a slow motion event. It has similar geology as the Roosevelt slide in this video. There are different Basalt flows with interbeds between them. There was enough time between Flood Basalt events for entire soil groups to form. The slide is at the south edge of the Ahtanum / Rattlesnake Anticline. The beds are tipped upwards to 45 degrees. Local quarry operation has been removing rock from base of ridge for a long time. That is probably what triggered slide. Slip is along dipped layers and the interbeds moving downhill towards the quarry. Operations at the quarry have ceased. The slide has slowed down, but has not stopped yet.
Another excellent presentation of your trademark perspectives, Bruce! The viewpoints you provide facilitate the defining of features too vast to fully discern from the ground. The slide debris certainly had the mobility for a long run-out, then fanned like a piedmont glacier. That isolated patch of irrigated farmland in between the Landslide complex & Roosevelt Slide? Sure, its probably very nutritious soil. However, if being flanked by such fine examples of instability isn't enough of a suggestion to the landowner that its a precarious location, perhaps a BB sky- vid of the 2009, hwy 410 Nile Valley Rockslide might whisper just a tad louder.... the scream of mortal awareness?
Considering the almost flat plain to the north it could have been caused by a torrential freak rainstorm south of Bickleton ,WA several thousand years ago. Don't think an earthquake could have caused this since other areas weren't affected. It was a wash of water that inundated that area where other areas nearby had the topography to handle, but if it was melt water from a long snowfall one winter, I could envision it happening then too.
Yes, what you say appears true except there are other huge landslides in the region so may have been a more widespread event (i.e., huge rainfall/snowmelt event +|- seismicity). Other huge slides nearby along NE side of Rattlesnake Mtn and Toppenish Ridge.
Awesome! That cross section could use some axis though, or a scale bar. I wanted to calculate its R value (long-runout vs. debris flow). Very cool, thanks for the video! Gotta love geomorphology
Nice video! Where exactly is this location? I happen to live on a terrace above Lake Roosevelt at Gifford. We had a smaller slide up above my house a few years ago and ever since then I've been noticing evidence of slides along the benches around here. Are these slopes prone to landslides because they are comprised of glacial till?
Thanks Susan. The Roosevelt slide occurred at east end of the Columbia River Gorge at Roosevelt, WA. The slides in Lake Roosevelt where you live have occurred since the construction of Grand Coulee Dam. Constant raising and lowering of the lake behind the dam destabilizes the slopes around the lake - leading to landslides.
@@bjornstad51 but it look like ... As all around the Crust ( think equidistant polar projection and maybe you will understand , the next Theory of earth expansion by carbonitite lava etc ...)
An annual revisit to a fascinating video!
Before the narrow canyon back-filled with levees, the onslaught of debris must have scoured it much deeper. The mobility of this slide is absolutely amazing. It even took the time to sort it's flows.
Gravity and liquefaction: Excellent dance partners!
Tango? Flamenco? Certainly not a Waltz.
Oh, BREAKDANCE!!..... Yeah, that's it.
'Love your vids Bruce~
Very interesting videos!
Wow! Your videos always leave me wanting to learn more.
Awesome! Thanks...recognized your name from watching Nick Zentner....so checking out your channel.
I'm in WV and used to seeing landslides and some flood features. But, everything out there is so dang huge and it's hard to put the scale in the old noggin. Love these videos, Bruce. Thank you.
great video as usual I would like to thank you for doing these videos My wife unfortunately is unable to travel to these places due to injuries and poor health like she did when younger but still gets to see them through your work whenever she wants on your channel many thanks for that
AWESOME!!!
Thanks, Bruce. Fascinating. Maybe a chinook wind event sliding down off the Cascades suddenly melted feet of snow in hours to provide the water weight and reduction in friction.
Thank you! Makes my day when you post a new video.
Thank you again for this incredible soulful footage and explanations. Appreciate the music, captions and arrows...very helpful as I have not background in geology. I have been trying to educate myself with the free youtube videos on geology but hands down I keep returning to your videos as the most impactful and mesmerizing.
Thanks again Linda
Linda, if you haven't seen them look at Nick Zentner's Geology 101 videos.
Thank you for the vid............................one of your best!!!!!
I can see the Rattlesnake Ridge landslide from my house in Union Gap. It has moved several hundred feet in last 3-4 years. It is a slow motion event. It has similar geology as the Roosevelt slide in this video.
There are different Basalt flows with interbeds between them. There was enough time between Flood Basalt events for entire soil groups to form. The slide is at the south edge of the Ahtanum / Rattlesnake Anticline. The beds are tipped upwards to 45 degrees.
Local quarry operation has been removing rock from base of ridge for a long time. That is probably what triggered slide. Slip is along dipped layers and the interbeds moving downhill towards the quarry. Operations at the quarry have ceased. The slide has slowed down, but has not stopped yet.
Agree.
Another excellent presentation of your trademark perspectives, Bruce!
The viewpoints you provide facilitate the defining of features too vast to fully discern from the ground.
The slide debris certainly had the mobility for a long run-out, then fanned like a piedmont glacier.
That isolated patch of irrigated farmland in between the Landslide complex & Roosevelt Slide?
Sure, its probably very nutritious soil. However, if being flanked by such fine examples of instability isn't enough of a suggestion to the landowner that its a precarious location, perhaps a BB sky- vid of the 2009, hwy 410 Nile Valley Rockslide might whisper just a tad louder.... the scream of mortal awareness?
Maximum distance I’ve flown is ~5000-6000 ft. Maximum height 1600 ft.
Considering the almost flat plain to the north it could have been caused by a torrential freak rainstorm south of
Bickleton ,WA several thousand years ago. Don't think an earthquake could have caused this since other areas
weren't affected. It was a wash of water that inundated that area where other areas nearby had the topography to handle,
but if it was melt water from a long snowfall one winter, I could envision it happening then too.
Yes, what you say appears true except there are other huge landslides in the region so may have been a more widespread event (i.e., huge rainfall/snowmelt event +|- seismicity). Other huge slides nearby along NE side of Rattlesnake Mtn and Toppenish Ridge.
@@bjornstad51 What is the age of the Bridge of the Gods landslide? Maybe an earthquake precipitated both events after snow/rain/melt event.
Awesome! That cross section could use some axis though, or a scale bar. I wanted to calculate its R value (long-runout vs. debris flow). Very cool, thanks for the video! Gotta love geomorphology
Thanks Pete. Cross section is diagrammatic and not specific to this landslide.
Nice job Bruce. How far away can you control your drone?
Nice video! Where exactly is this location? I happen to live on a terrace above Lake Roosevelt at Gifford. We had a smaller slide up above my house a few years ago and ever since then I've been noticing evidence of slides along the benches around here. Are these slopes prone to landslides because they are comprised of glacial till?
Thanks Susan. The Roosevelt slide occurred at east end of the Columbia River Gorge at Roosevelt, WA. The slides in Lake Roosevelt where you live have occurred since the construction of Grand Coulee Dam. Constant raising and lowering of the lake behind the dam destabilizes the slopes around the lake - leading to landslides.
Bruce, is the white stuff from an ash fall?
Yes, the white material is probably ash, perhaps from eruptions from ancient Yellowstone hotspots.
no irruptions involved ? ...
No volcanic eruption here.
@@bjornstad51 but it look like ... As all around the Crust ( think equidistant polar projection and maybe you will understand , the next Theory of earth expansion by carbonitite lava etc ...)
Hard to watch with the terrible moaning and groaning music. If you can even call it that
Turn down/off the volume and you can get the silence you crave. I love the music as it sets a tone that matches the wonder of the landscape.