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Posted on 04/22/2021 6:20:01 PM PDT by Rebelbase
A rare and extreme tsunami ripped across an Alaska fjord three years ago after 180 million tons of mountain rock fell into the water, driving a devastating wave that stripped shorelines of trees and reached heights over 600 feet, a large team of scientists documented Thursday.
The October 2015 cataclysm in Taan Fiord in Southeast Alaska appears to have been the fourth highest tsunami recorded in the past century, and its origins - tied to the retreat of a glacier - suggest it’s the kind of event we may see more of due to a warming climate..
The new study even bluntly calls it a "a hazard occasioned by climate change."
“More such landslides are likely to occur as mountain glaciers continue to shrink and alpine permafrost thaws,” the authors, led by geologist Bretwood Higman of Ground Truth Trekking, write in Nature Scientific Reports..
"Thirty-odd, 40 years ago, Taan Fiord didn't exist at all. It was filled with ice," added Dan Shugar, a geoscientist at the University of Washington in Tacoma and another of the study's 32 authors, who hail from institutions in the United States, Canada and Germany.
(Excerpt) Read more at adn.com ...
What is fascinating to me is a Geologic event on the scale of the 1958 Lituya Bay , AK landslide and Tsunami went completely unnoticed. It was only discovered by someone reviewing seismic data at a desk in DC and noticed a landslide earthquake that was later investigated.
This wave scoured the Fjord walls up to 600 feet vertical. And no one knew.
Was that the one where a man and his son rode it out in their fishing boat.?
“Climate Change”
These scientists make it sound as if tsunamis, earthquakes, retreating glaciers, tornadoes, hurricanes, forest fires, etc. never happened until the invention of the automobile.
OMG!!!
[May Gretta help us...]
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Yes, Lituya Bay.
Had y’all heard about this?
There is a growing glacier in Alaska that is threatening a village in that state. The glacier will eventually close off a water drainage and flood the village.
This was the subject of a Mike Rowe Dirty Jobs episode.
If is noted that this Dirty Jobs episode was one of two removed from archives.
Any chance that a landslide like that would expose gold?
No clue.
There have several of these localized tsunamis in the inlets of British Columbia and Alaska.
There is a movie on Netflix about the ones in Norway. It looked pretty good but I didn’t want to read subtitles for 2 hours.
Last fall's massive Icy Bay landslide launched a megatsunami (2016)
A couple of links to older Free Republic posts about the tsunami.
I think there were a couple of fishing boats in the bay when it hit. A man and his son were near the mouth and miraculously rode it out. The other boat didn’t, as best I remember it.
I seem to remember a Tarzan episode with Adam West. Someone was tied to the beach and a Tsunami was coming in.
There wasn’t a glacier involved.
Yep.
Eyewitness Accounts from Survivors
(As reported by Don J. Miller in United States Geological Survey Professional Paper 354-C, Giant Waves in Lituya Bay, Alaska, 1960)
Account of Howard G. Ulrich
Mr. Ulrich and his 7-year-old son, on the Edrie, entered Lituya Bay about 8:00 p.m. and anchored in about 5 fathoms of water in a small cove on the south shore. Ulrich was awakened by the violent rocking of the boat, noted the time, and went on deck to watch the effects of the earthquake-described as violent shaking and heaving, followed by avalanching in the mountains at the head of the bay. An estimated 2 1/2 minutes after the earthquake was first felt a deafening crash was heard at the head of the bay. According to Ulrich,
“The wave definitely started in Gilbert Inlet, just before the end of the quake. It was not a wave at first. It was like an explosion, or a glacier sluff. The wave came out of the lower part, and looked like the smallest part of the whole thing. The wave did not go up 1,800 feet, the water splashed there.”
Ulrich continued to watch the progress of the wave until it reached his boat about 2 1/2 to 3 minutes after it was first sighted. Being unable to get the anchor loose, he let out all of the chain (about 40 fathoms) and started the engine. Midway between the head of the bay and Cenotaph Island the wave appeared to be a straight wall of water possibly 100 feet high, extending from shore to shore. The wave was breaking as it came around the north side of the island, but on the south side it had a smooth, even crest. As it approached the Edrie the wave front appeared very steep, and 50 to 75 feet high. No lowering or other disturbance of the water around the boat, other than vibration due to the earthquake, was noticed before the wave arrived. The anchor chain snapped as the boat rose with the wave. The boat was carried toward and probably over the south shore, and then, in the backwash, toward the center of the bay. The wave crest seemed to be only 25 to 50 feet wide, and the back slope less steep than the front.
After the giant wave passed the water surface returned to about normal level, but was very turbulent, with much sloshing back and forth from shore to shore and with steep, sharp waves up to 20 feet high. These waves, however, did not show any definite movement either toward the head or the mouth of the bay. After 25 to 30 minutes the bay became calm, although floating logs covered the water near the shores and were moving out toward the center and the entrance. After the first giant wave passed Ulrich managed to keep the boat under control, and went out the entrance at 11:00 p.m. on what seemed to be a normal ebb flow.
Account of William A. Swanson
Mr. and Mrs. Swanson on the Badger entered Lituya Bay about 9:00 p.m., first going in as far as Cenotaph Island and then returning to Anchorage Cove on the north shore near the entrance, to anchor in about 4 fathoms of water. Mr. Swanson was wakened by violent vibration of the boat, and noted the time on the clock in the pilot house. A little more than a minute after the shaking was first felt, but probably before the end of the earthquake, Swanson looked toward the head of the bay, past the north end of Cenotaph Island and saw what he thought to be the Lituya Glacier, which had “risen in the air and moved forward so it was in sight. * * * It seemed to be solid, but was jumping and shaking * * * Big cakes of ice were falling off the face of it and down into the water.” After a little while “the glacier dropped back out of sight and there was a big wall of water going over the point” (the spur southwest of Gilbert Inlet). Swanson next noticed the wave climb up on the south shore near Mudslide Creek. As the wave passed Cenotaph Island it seemed to be about 50 feet high near the center of the bay and to slope up toward the sides. It passed the island about 2 1/2 minutes after it was first sighted, and reached the Badger about 1 1/2 minutes later. No lowering or other disturbance of the water around the boat was noticed before the wave arrived.
The Badger, still at anchor, was lifted up by the wave and carried across La Chaussee Spit, riding stern first just below the crest of the wave, like a surfboard. Swanson looked down on the trees growing on the spit, and believes that he was about 2 boat lengths (more than 80 feet) above their tops. The wave crest broke just outside the spit and the boat hit bottom and foundered some distance from the shore. Looking back 3 to 4 minutes after the boat hit bottom Swanson saw water pouring over the spit, carrying logs and other debris. He does not know whether this was a continuation of the wave that carried the boat over the spit or a second wave. Mr. and Mrs. Swanson abandoned their boat in a small skiff, and were picked up by another fishing boat about 2 hours later.
I didn’t feel a thing.
The old topic about the Lituya Bay tsuami -- the debris line lies 1/3 of a mile above sealevel -- was probably one of the old-URL topics and is long gone. Very little in the keyword as well.
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Thanks Rebelbase!
Fear, the easiest seed to plant and grow!
“Thirty-odd, 40 years ago, Taan Fiord didn’t exist at all. It was filled with ice.”
Not according to the timeline imagery on Google Earth.
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