How climate change triggered a landslide tsunami in a Greenland fjord, vibrating Earth for 9 days
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- เผยแพร่เมื่อ 18 ก.ย. 2024
- Climate change is increasingly exposing polar regions to large landslides. Tsunamigenic landslides have occurred recently in Greenland, but none have been reported from the eastern fjords. In September 2023, we detected the start of a 9-day-long global 10.88 mHz (92 s) monochromatic very-long period (VLP) seismic signal, originating from East Greenland. We demonstrate how this event started with a 25 M m3 glacial thinning-induced rockslide plunging into Dickson Fjord, triggering a 200 m high tsunami. Simulations show the tsunami stabilized into a 7 m-high long-duration seiche with a near-identical frequency (11.45 mHz) and slow amplitude decay as the seismic signal. An oscillating, fjord-transverse single-force reproduces the seismic amplitudes and their radiation pattern relative to the fjord, demonstrating how a seiche directly caused the 9-day long seismic signal. Our findings highlight how climate change is causing cascading, hazardous feedbacks between the cryosphere, hydrosphere and lithosphere.
The study was conducted by Svennevig et al. (2024) and published in Science.
The paper is available here: www.science.or... (and without the paywall here: drive.google.c....
Music credit: "Seiche" by Isabelle Ryder ( • Seiche ; isabelleryderm...).
Was linked to this by the Dutch NOS news, fascinating piece! Astonishing science
*chuckles* I'm in danger
Based NOS 🇳🇱😎💪🏻
Me too!
Same here from Iceland, fascinating stuff
Also here via NOS🇳🇱
Voor Nederlandstalige kijkers: een "seiche" is is de internationale term voor een "haling". Dat is een oscillerende golf: een golf die heen en weer klotst in een (gedeeltelijk) ingesloten watermassa. Zoals in een fjord, meer etc.
Congratulations, your views went up from 100 to 100.000. 😀
Thanks to major media linking to this.
Thanks for your comment and interest.
This is the sort of science video that shows TH-cam at its best. Thanks very much!
Thanks so much - this is great to hear - and all my efforts in making the video have paid off :)
The Unsung hero's of climate change. You can blame the NOS for making me watch this. And i now have a much deeper understanding of seismology. Thanks for that!
Amazed that you were able to figure it all out! Extraordinary story. Thanks for the excellent video
Great video and explanation on the event. Never crossed my mind that glaciers also hold back a lot of the land mass as well as the glacier itself. Very interesting.
Solid explanation and I enjoyed watching the presentation from the source group. Usually this news comes from science channels that browse papers but today this was linked from Dutch general news about the discovery, so that's cool.
Mother Earth talks to us with a subwoofer. "Thank you for listening."....
Calling it a USO, and they say seismologists have no sense of humor!
Super clear, well explained and helpful animations! Thanks!
There's a Norwegian disaster movie called Bølgen (The Wave), which is about this kind of tsunami happening in a fjord in Norway. It's pretty good!
It is one of scariest disaster movies according to some critics. I kinda don't want to challenge myself ot see it. I think it was made after similar events in Alaska if I am not mistaken?
@@Pecisk Wouldn't say it's all that scary in terms of the movie itself. The fact that it's based on a real scenario makes it a lot better than most disaster movies, but it still falls into many of the same tropes. And its premise starts with looking back on a similar event that actually happened in Norway in the early 1900s if I remember correctly.
No, its a ridiculous movie.
Great analysis, keep up the good work! 👍🏻
Amazing explanation - very clear laymen language. Thank you
Great explanation. Accessible and interesting!
thanks so much for your nice feedback - made the effort worthwhile :)
Great video explanation. Much obliged.
In Thai Newspaper written about this today Sep13,2024 but I'm not understand until I watched this video , thanks for the information.
Agree. These people understand this stuff so good that they really can explain it to us.
Great and very interesting! Thank you!
Awesome explanation on this event! Would love to see a 3D-animation of the landslide and 200m(!!) high wave. I'd like to learn more on how quick the big wave disappeared and how the wave kept moving under water. The navy was there 3 days after? Didn't they notice anything on their ships of that movement of the water? Very interesting stuff this!
The quick wave disappeared pretty quickly and settled into a low amplitude wave sloshing back and forth in the fjord. When the navy went, it would have been
This shows testament to the accuracy and sensitivity of the monitoring of our planet and the intelligence of the scientists that analyse these data.
Thanks so much for your comment and keen interest in our study.
Very interesting
Thank you for this information as it’s so fascinating.
Glad you enjoyed it!
Fascinating story and video!
Very interesting study and once again a reminder of the significance of science and the human impact on our environment.
Many thanks for your nice comment and your interest - much appreciated.
Thank you😊 Amazing to see and hear. Will there be any next steps or actions taken from your findings?
whaow! such an effect of such an event, real scary actually!
Great video, I second every positive commend! One recommendation: don't add music, it's a bit distracting and not necessary. The video is interesting enough in itself.
Amazing report! And a shocking realization about climate change...😔
Many thanks for your nice comment and your interest - much appreciated.
Thank you for making this
Thanks so much for your nice comment and interest.
Great video!
Love it!
I found the link in Mastodon. Thanks for the great work analyzing what happened and for the excellent video.
Many thanks for your nice comment.
Excellent presentation.
Many thanks for your nice comment and your interest - much appreciated.
I bet an intern or two had a great laugh when coming up with the term Unidentified Seismic Object.
Actually, the term came from one of our most senior and experienced coauthors :)
Could any other later seismic events (earthquakes) be related (caused) by this event? I would be surprised if this wasn't the case.
Very interesting. Are the additional files also somewhere available?
@@astrophotonl hello, which additional files do you mean exactly?
@@stephenhicks9108 the supplementary texts that are mentioned. S1 to S6.
I did research in geophysics in the past and now I'm a physics teacher. I showed this to my exam classes to show the relation between physics, and what they learn, and the real life. It's a great example!
You can find our supplementary materials here: www.science.org/action/downloadSupplement?doi=10.1126%2Fscience.adm9247&file=science.adm9247_sm.pdf (let me know though if you have any problems getting this).
I need to see a visual representation of this
Is this video not sufficient‽
at 3.03 the Danish geologist talks about 'west of the landslide', mustn't that be, because the Dickson Fjord is shown at a more widest point, 'east of the landslide' ?
Yes, you're right that it was a mistake, but I corrected the subtitle/CCs :)
Climate change has been great here in England the last 10 years has turned spain into an oven that brings us more regular heat. This summer was the worst in 9 years yet still way hotter than the 70s 80s 90s. We should just let cows roam free everywhere like they do in india and make cars more affordable.
Does anyone know what exactly is meant by the "destroyed cultural and archaeological heritage sites across the fjord system" mentioned in the GEUS article?
Good question, Thule Culture Inuit archaeological sites and 20th-century trapper huts were destroyed by the tsunami which meant that no such event had occurred in at least 200 years.
An interesting question given the novel nature of this signal. What effect does a *continuous* mulit-day hum of crust vibrations have on fault zones?
and kudos to the calling the 200m runup a 'splash' and not just a tsunami. Very different wave types.
That was exactly my question, which remains unanswered. I would be surprised if it had no correlation at all with other seismic events during that time.
Many thanks for your question. Once the seismic waves leave Greenland, the ground vibrations are very minor (< micrometers displacement) and are so long in oscillation period that they are unlikely to dynamically affect any stress changes along faults. We didn't observe any increase in global seismic activity after this event.
Titans are waking up
But how can sloshing water generate a seismic signal? Afterall, it's just water..? What am I missing?
'Just water'? I dare you to slap a surface of water with your hand as HARD as possible, without saying ouch!
Have you ever heard of a seismic signal being generated by a wave? Seiche in a fjord, even if 7m high, is still a wave (made of sea water). Actually, the world has seen much bigger waves hitting shores due to hurricanes, etc.
Read the paper
Many thanks for your comment. So the water's centre of gravity keeps moving back and forth, essentially crashing against the fjord walls, which transfers momentum, generating seismic energy through the Earth's crust.
We also see seismic signals (as a form of noise) due to approaching hurricanes and storms.
@@stephenhicks9108 This for this clarification, which is very useful. So, seiche is really not a 'wave' in the usual sense, but the entire water in the fjord actually moves back and forth. Due to friction with the fjord walls, some momentum gets transferred with each bounce, which manifests itself as a detectable sesmic signal. Did I get it?
Climate change caused that piece to break away and splash down into the water beneath it? In order a rumble to travel around the globe with a hum that went on for days, is it ridiculous to disagree? Something flew by made contact with our planet in order to have such an impact. As a explanation, the climate change theory is convenient as an answer to prevent anyone from critically thinking about the size/impact that came along with this event. Maybe a volcanic release somewhere, activity from the sun, or whatever can be used from the past to compare this with. Something is not adding up. Like the anomalies occuring in the southern ocean of the coast of South Africa. Climate change is a broad statement. When used as the cause of such an event it lacks any details one would expect after a global shock felt around the world.
Fascinating example! Great science and team effort! However, your claim about climate change being the "cause" was a bit wild. I agree that anthropogenic warming has enabled this event but drawing such a direct line is too much for me. I know it gets views / funding saying these things but it compromises the science.
You believe there is *not* a direct correlation between this event and climate change? Are we even able at this point to definitively distinguish between such events, those that are and those that are not caused by anthropegenic warming? I understand there are numerous factors at play, I assume they all fall under the umbrella of climate change.
Did they not establish some time ago that the deglaciation occurring in places such as the Lewis Range was attributed to a combination of both natural and non-natural causes, however, that the markedly accelerated pace of this deglaciation was in fact due to anthropogenic warming? These are sincere queries, and I greatly appreciate your reply and/or any references that could be provided to enlighten one in the matter.
Taylor Ruth Jackson Mary Wilson Kimberly
Why was this idiotic music added? Just let the speak stand by itself!
This tsunami wasn’t the result of an earthquake? The waves felt around the world were actually the tsunami?
You didn't watch the movie.
A tsunami is a big water wave, the big water wave was in the fjord. The waves around the world were vibrations in bedrock/sediment.
The tsunami was the result of the landslide from above the glacier. The glacier was thinned bc of the warmer climate. Couldn't sustain the weight of the land above it anymore . So a landslide occurred. The video explains it pretty well!
@@OneWithTheOcean Wow! I thought I might have missed something.
What I understood was, Vibrations felt around the world was of Seiche created in Dickson Fjord
Pics or it didn't happened
Lots of pictures of before and after in the vid. Look at what happened on Ella island (70 km from the source of the wave). And all the vegetation gone.
Watch the video, or you have no clue.
HAARP
Bless you!
HAARP
The climate is always changeing,, always have been,always will do,, ! ITS NOTHING NEW the earth is alive !!!!
🥱🙄 Moronic.
Grow up