Okanagan Lake tsunami risk?

Re: Okanagan Lake tsunami risk?

Postby GordonH » Feb 4th, 2019, 5:08 pm

Here is last megatsunami that happened, it was a lake that was effected, just south of BC.
: Spirit Lake, Washington, USEdit

Main articles: Spirit Lake (Washington), 1980 eruption of Mount St. Helens, and Mount St. Helens

On May 18, 1980, the upper 460 metres (1,509 feet) of Mount St. Helens collapsed, creating a massive landslide. This released the pressure on the magma trapped beneath the summit bulge which exploded as a lateral blast, which then released the pressure on the magma chamber and resulted in a plinian eruption.

One lobe of the avalanche surged onto Spirit Lake, causing a megatsunami which pushed the lake waters in a series of surges, which reached a maximum height of 260 metres (853 feet) above the pre-eruption water level (~975 m asl/3,199 ft). Above the upper limit of the tsunami, trees lie where they were knocked down by the pyroclastic surge; below the limit, the fallen trees and the surge deposits were removed by the megatsunami and deposited in Spirit Lake.


There is no active volcanoes in BC, as a kid there was hot springs atop Mt Ida near Salmon Arm.
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Re: Okanagan Lake tsunami risk?

Postby alanjh595 » Feb 4th, 2019, 5:21 pm

ferri wrote:How do landslides cause tsunamis?

https://www.usgs.gov/faqs/how-do-landsl ... e_products


In the grand scope of things, Okanagan lake is rather small. From the above noted link:
Tsunamis are large, potentially deadly and destructive sea waves, most of which are formed as a result of submarine earthquakes.


The landslide that is in question, I am assuming, is the one that is happening right now. I believe that is no danger of a tsunami there.
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Re: Okanagan Lake tsunami risk?

Postby atenbacon » Feb 4th, 2019, 6:17 pm

Mount Boucherie was at one time a volcano... about 50 or so million years ago, so pretty safe there I would bet. A landslide would have little effect as the volume of water any landslide would displace is not going to be anything significant enough to travel far... It's not exactly a very deep lake all over... a lot of the waves energy would disperse well before it were to reach Kelowna.

But hey... there's always meteorites right?
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Re: Okanagan Lake tsunami risk?

Postby Terris » Feb 4th, 2019, 6:59 pm

GordonH wrote:
There is no active volcanoes in BC, as a kid there was hot springs atop Mt Ida near Salmon Arm.


Not true...

http://www.env.gov.bc.ca/bcparks/explor ... mt_edziza/

GordonH wrote:
The cause of the landslide that created this tsunami was 7.8 earthquake.
Highly doubtful this area of okanagan will ever experience a quake anywhere near enough to cause the hillside to end up in Okanagan Lake.


Okanagan Lake, as we now see it, did not exist before the last ice age. All the deposits from the very rift bottom (approximately1000m below sea level to the current deepest point of the lake @700 + feet) are from the last ice age.

Okanagan Lake and most of the other north/south oriented lakes in the southern half of BC were formed after seismic events powerful enough to tear the earth apart forming the Okanagan Valley rift.

This quake would easily have been in excess of 7.8 magnitude.

http://www.shuswapwatershed.ca/teacherg ... anagan.pdf

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Re: Okanagan Lake tsunami risk?

Postby WalterWhite » Feb 4th, 2019, 7:00 pm

GordonH wrote:
monilynno wrote:Never say never. "World's Tallest Tsunami Hit An Alaskan Bay In 1958 And It Was Not The First Of Its Kind"
https://www.forbes.com/sites/davidbress ... 3ea673d7ce


The cause of the landslide that created this tsunami was 7.8 earthquake.
Highly doubtful this area of okanagan will ever experience a quake anywhere near enough to cause the hillside to end up in Okanagan Lake.


alanjh595 wrote:An earthquake would cause the whole lake to shake and "slosh", a landslide would just cause a "splash".


Lol - someone should have paid more attention in geography class.
Eta: the post by driptorch on page 1 is a good example of what is a realistic possibility. Not “end of days” catastrophic, but enough to cause serious damage.
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Re: Okanagan Lake tsunami risk?

Postby alanjh595 » Feb 4th, 2019, 7:16 pm

Take a bowl of water and shake it from side to side, see the slosh? Now take that same bowl of water and drop a stone in it, see the difference?
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Re: Okanagan Lake tsunami risk?

Postby TreeGuy » Feb 4th, 2019, 7:32 pm

From page 1 of this thread.


Drip_Torch wrote:Yeah, it's happened before...

July 20, 1951
(Tsunami).
Source: The Penticton Herald, July 26, 1951; Evans 1986 (pp. 164-166); Evans, unpublished data.
Details: On July 20 at 6:45 p.m., a landslide caused a wave in Okanagan Lake near Penticton. The slide in glaciolacustrine silt destroyed a house. An immense wall of water rapidly bore down on the house. The water receded as quickly as it had come. A baby was rescued from the ruins of the house. Fifteen boats were also lost (Evans and Clague 1999). A family of four narrowly escaped the tons of clay that slid into the lake. A woman was wedged beneath a chaise lounge on the veranda, which railing had kept her from being swept away. Water had entirely filled the house, slightly south of the Three-Mile Beach on the east side of Okanagan Lake, when the wave crashed over it. An insurance adjuster found silt imbedded on top of a shelf of a floor to ceiling cupboard. Also dead fish were found on the roof.

One acre (0.4 ha) of orchard with 33 fruit-bearing trees was gouched out of the cliff. With a “terrific rumbling” a solid wall of water hit the cottage. A concrete 9-in. (22.5 cm) wall cracked “as though it had been a piece of 2 x 4.” The thousands of tons of earth engulfed the lakeside home at Three Mile point and created a 12-ft. (3.6 m) wave. The wave devastated the shore for over 0.5 mi. (800 m). A car was hurled 200 ft. (60 m) onto the beach. The 2-ton sailboat Marion was bodily lifted and deposited high and dry 100 ft. (30 m) from where she had been moored. A cabin cruiser, moored short an unable to ride the crest, was submerged. A four-cylinder marine engine was found 50 ft. (15 m) from its stand.


http://www.env.gov.bc.ca/wsd/public_saf ... south2.pdf


Aerial-photo-of-landslide-south-of-Three-Mile-Point,-1953---Penticton-Archives--Photographer-unknown.jpg

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Re: Okanagan Lake tsunami risk?

Postby alanjh595 » Feb 4th, 2019, 7:44 pm

More damage was from last year's flooding. Just not the dramatic wave involved.
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Re: Okanagan Lake tsunami risk?

Postby monilynno » Feb 18th, 2019, 12:53 pm

alanjh595 wrote:More damage was from last year's flooding. Just not the dramatic wave involved.


And there in lies to point many have been trying to make to you. It can and has happened In Okanagan lake, and the damage is directly proportional to the size of the land slide and volume of water displaced.
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Re: Okanagan Lake tsunami risk?

Postby vinnied » Feb 18th, 2019, 2:03 pm

GordonH wrote:

There is no active volcanoes in BC, as a kid there was hot springs atop Mt Ida near Salmon Arm.

Funny you mention salmon arm and Mt Ida.
If anyone is familiar with the area they know of Bastion mountain. If a lake tsunami was ever to happen around these parts, my prediction is it will be on Shuswap lake when that mountain finally lets go. There's already been several landslides. Canoe will be a right off, and downtown Salmon arm will be almost completely destroyed. Hard to say what sicamous would look like, but my guess it will be under water as well
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Re: Okanagan Lake tsunami risk?

Postby GordonH » Feb 18th, 2019, 2:27 pm

GordonH wrote:There is no active volcanoes in BC, as a kid there was hot springs atop Mt Ida near Salmon Arm.

vinnied wrote:Funny you mention salmon arm and Mt Ida.
If anyone is familiar with the area they know of Bastion mountain. If a lake tsunami was ever to happen around these parts, my prediction is it will be on Shuswap lake when that mountain finally lets go. There's already been several landslides. Canoe will be a right off, and downtown Salmon arm will be almost completely destroyed. Hard to say what sicamous would look like, but my guess it will be under water as well


Knowing how many small rock slides have happened over years, personally there is no way I'd ever live anywhere near that rock face.
I know of 2 mountain side slides in southern interior (does not include mudslides):
1) Hope/Princeton
2) out towards Mica Dam (I believe that was called the Downie Slide).
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Re: Okanagan Lake tsunami risk?

Postby TerriJ73 » Feb 18th, 2019, 2:34 pm

Last year, while paddle boarding, I got hit by a three foot high tsunami. Threw me clear off the board.
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Re: Okanagan Lake tsunami risk?

Postby GordonH » Feb 18th, 2019, 2:39 pm

TerriJ73 wrote:Last year, while paddle boarding, I got hit by a three foot high tsunami. Threw me clear off the board.


Paddle boarding on a windy day is unadvised. lol
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Re: Okanagan Lake tsunami risk?

Postby phasyluck » Feb 18th, 2019, 8:11 pm

Joe Public wrote:If you recall a few years ago, when they were 4 laning Rte 97 between Summerland and Peachland, the rock above the highway separated and shifted, forcing construction to temporarily shut down, most likely due to the massive amount of blasting involved in highway construction. This is a very large, and very high rock face, and the fact that a lateral seam has been blasted from one end to the other would obviously weaken it.

There is more than ample material available to create a massive lake tsunami, and while I don't think that the highway blasting could have dislodged it, I do believe that the highway blasting may have fractured a good portion of it, and that a medium tremor in the future could be the trigger to send the entire hillside down. No one has to travel far to see the Hope slide, and the magnitude of destruction possible.

More interesting is the fact that the BC Liberals privatized the entire geotechnical section of the Ministry of Transportation, and there is no one currently watching the stability of the area. If everyone will recall, the BC Liberals basically eliminated dam inspectors in BC, with results being the dam break in Oliver and the Mount Polly disaster.

My opinion is that it's not a matter of if, but when.
. Was always wondering about that when it occurred, I think there would be a crazy huge tsunami that would cause large amounts of damage if she lets loose.
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Re: Okanagan Lake tsunami risk?

Postby OKkayak » Feb 19th, 2019, 2:24 am

TerriJ73 wrote:Last year, while paddle boarding, I got hit by a three foot high tsunami. Threw me clear off the board.

I'd get thrown clear off the board in glass clear water [icon_lol2.gif]

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