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Author Topic: Tsunami from earthquakes or glacier calving?  (Read 2059 times)

Espen

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Tsunami from earthquakes or glacier calving?
« on: June 18, 2017, 01:28:56 PM »
« Last Edit: June 18, 2017, 01:37:49 PM by Espen »
Have a ice day!

Espen

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Jim Hunt

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Re: Tsunami from earthquakes or glacier calving?
« Reply #2 on: June 18, 2017, 05:08:41 PM »
I can find no record of a recent earthquake in the vicinity. Can anybody else?
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sesyf

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Re: Tsunami from earthquakes or glacier calving?
« Reply #3 on: June 18, 2017, 05:17:19 PM »
Radio news here told that a 4.0 earthquake would have taken place...

Jim Hunt

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Re: Tsunami from earthquakes or glacier calving?
« Reply #4 on: June 18, 2017, 05:25:15 PM »
There's no sign of it on this list though:

https://www.emsc-csem.org/Earthquake/world/M4/
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doogi

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Re: Tsunami from earthquakes or glacier calving?
« Reply #5 on: June 18, 2017, 05:37:52 PM »
I can find no record of a recent earthquake in the vicinity. Can anybody else?


I belive this might be the one:

http://www.earthquakescanada.nrcan.gc.ca/index-en.php?CHIS_SZ=arctic
http://www.earthquakescanada.nrcan.gc.ca/recent/maps-cartes/index-en.php?tpl_region=arctic#events
2017/06/09    09:32:49    73.22    -72.70    18.0    3.5    No    183 km E from Pond Inlet,NU


Nevermind, appears to be wrong date

Andreas Muenchow

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Re: Tsunami from earthquakes or glacier calving?
« Reply #6 on: June 18, 2017, 05:56:34 PM »
Google translate from the Danish news that Epsen linked to

"GEUS states in an email KNR that an earthquake has a magnitude of 4.1 approx. 28 kilometers north of Nuugaatsiaq last night at 23 o'clock, and it probably is what triggered an earthquake and created the great waves.

The police still call on people in the fjord system around Uummannaq to stay away from the coastal areas as aftershocks can not be ruled out."

Checking the tide gauge at Thule next to see, if the waves are seen there ...

EDIT: No tsunami signal at Thule http://www.ioc-sealevelmonitoring.org/station.php?code=thul

EDIT-2: Large landslides did occur in the Disko Bay region before and caused tsunamis. A 2000 tsunami was as observed and published in https://www.degruyter.com/downloadpdf/j/popore.2015.36.issue-1/popore-2015-0005/popore-2015-0005.pdf which perhaps explains what happened last night. Lets hope that the 4 people still missing are alive and will be found soon.
« Last Edit: June 18, 2017, 06:46:09 PM by Andreas Muenchow »
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doogi

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Re: Tsunami from earthquakes or glacier calving?
« Reply #7 on: June 18, 2017, 07:48:39 PM »
GEUS latest statement is that they're not sure whether it's an earthquake or an landslide that caused the tsunami.
GEUS measuring station in  Nuugaatsiaq registered the event at about 21.40 and the tsunami hit the island 8 minutes later.

http://knr.gl/da/nyheder/usikkert-om-det-er-jordsk%C3%A6lv-eller-jordskred]
[url]http://knr.gl/da/nyheder/usikkert-om-det-er-jordsk%C3%A6lv-eller-jordskred
[/url]

Adam Ash

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wili

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Re: Tsunami from earthquakes or glacier calving?
« Reply #9 on: June 19, 2017, 12:09:16 AM »
Any indication of wave height at landfall?

This discussion of the relation of calving and seismic activity may end up to prove relevant here:

https://www.washingtonpost.com/news/energy-environment/wp/2015/06/25/giant-earthquakes-are-shaking-greenland-and-scientists-just-figured-out-the-disturbing-reason-why/?utm_term=.4986ff88d888

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Phil.

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Re: Tsunami from earthquakes or glacier calving?
« Reply #10 on: June 19, 2017, 02:48:55 AM »
There has been tsunamis recorded from glacier calving before here's a paper on one:
http://www.the-cryosphere.net/10/995/2016/tc-10-995-2016.pdf

jai mitchell

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Re: Tsunami from earthquakes or glacier calving?
« Reply #11 on: June 19, 2017, 03:25:56 AM »
I woke from a dream this morning where I was standing in a town across from a very large body of water with a partially snow-covered mountain on the other side that, due to an earthquake, collapsed into the ocean (lake?).  A very large Tsunami was coming and we had to run to high ground (woke up before the end but I don't think we made it since the whole mountain (about 2,500 meters high) collapsed into the water.

not that this means anything at all but I have my suspicions. . . :P
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nicibiene

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Re: Tsunami from earthquakes or glacier calving?
« Reply #12 on: June 19, 2017, 08:01:39 AM »
I always look this earthquake map, Svalbard was hit too. Connected? https://earthquakes.volcanodiscovery.com/

Jai, once I dreamed our steep hill behind the house (a mining halde, that creates streams in our garden when undermined by flooding rains or rapid snowmelt) starts sliding due to heavy rains...  :o Heard a week ago that there was indeed a landslide once, some years ago...not a pleasant dream.  :-X
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nukefix

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Re: Tsunami from earthquakes or glacier calving?
« Reply #13 on: June 19, 2017, 10:22:37 AM »
There's no way a 4.0 earthquake can start a tsunami. It might trigger a landslide or huge calving though. I'd look through satellite imagery including Sentinel-1 and try to identify what has changed.

johnm33

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Re: Tsunami from earthquakes or glacier calving?
« Reply #14 on: June 19, 2017, 10:31:58 AM »
The ground was very wet in the vid., duckboards and all, there was cloud cover the whole previous day, did it rain in the mountains? Signs of rapid flow here http://www.polarview.aq/images/106_S1jpgsmall/201706/S1A_EW_GRDM_1SDH_20170618T104039_8E6A_N_1.jpg When things clear we'll see what happened, hope it wasn't a 'permafrost' mountain collapsing.

doogi

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Re: Tsunami from earthquakes or glacier calving?
« Reply #15 on: June 19, 2017, 02:27:13 PM »
The landslide causing the tsunami is now located at Karrat icefjord.


http://knr.gl/da/nyheder/fjeldskred-i-karrat-isfjorden-skyld-i-flodb%C3%B8lge
« Last Edit: June 19, 2017, 08:29:04 PM by doogi »

Urbanus Simpliticus

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Re: Tsunami from earthquakes or glacier calving?
« Reply #16 on: June 20, 2017, 01:37:29 AM »
 A minor Stochastic event affiliated with the permafrost condition.
Only displacement creates tsunamis
It's not a seismically active area, so the sensors sensed the actual collapse.
It's quite conceivable that some calving tsunamis will run up a neighboring fiords. Possibly triggering other events.
The fiord ice appears to have been swamped in the vicinity.
 The local tide cycle has a peak to trough of 2.5 meters which is impressive for the location, and the houses are of course situated for the max tide.
Thanks for the local tide level posts.

The landslide causing the tsunami is now located at Karrat icefjord.


http://knr.gl/da/nyheder/fjeldskred-i-karrat-isfjorden-skyld-i-flodb%C3%B8lge

TerryM

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Re: Tsunami from earthquakes or glacier calving?
« Reply #17 on: June 20, 2017, 05:22:52 AM »
This is going to have shaken off a lot of fast ice. I wonder if local glacier's will speed up?


Terry

johnm33

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Re: Tsunami from earthquakes or glacier calving?
« Reply #18 on: June 20, 2017, 09:49:28 AM »
before and after 5  19


georged

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Re: Tsunami from earthquakes or glacier calving?
« Reply #19 on: June 20, 2017, 12:33:58 PM »
before and after 5  19



Look at how much snow cover has been lost. Impressive.

Hans

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Re: Tsunami from earthquakes or glacier calving?
« Reply #20 on: June 20, 2017, 07:35:58 PM »

Look at how much snow cover has been lost. Impressive.
I assume just melted in 14 days time; it's summer ;). Not due to land slide.

But: Please help me to spot the landslide in these images. I do not see a difference.. :-\

ms

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Re: Tsunami from earthquakes or glacier calving?
« Reply #21 on: June 20, 2017, 10:14:37 PM »
More details about the land slide and the risk of another slide here:
https://ing.dk/artikel/geus-overhaengende-risiko-nyt-fjeldskred-groenland-200633
(in danish)

Reallybigbunny

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Re: Tsunami from earthquakes or glacier calving?
« Reply #22 on: June 21, 2017, 01:30:57 AM »
« Last Edit: June 21, 2017, 01:39:09 AM by Reallybigbunny »

FishOutofWater

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Re: Tsunami from earthquakes or glacier calving?
« Reply #23 on: June 23, 2017, 03:49:55 PM »
Large landslides causing destructive tsunamis are becoming more frequent in Alaska as the climate warms. The same processes of meltwater and permafrost degradation weakening steep slopes will affect Greenland and the CAA.

solartim27

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Re: Tsunami from earthquakes or glacier calving?
« Reply #24 on: July 05, 2017, 06:17:30 PM »
Likely to be more in the near future (this is full translated text, minus links to other articles)

http://knr.gl/da/nyheder/endnu-et-fjeldskred-truer
Apparently there is not just one - but two - areas at risk of landslide at Nuugaatsiaq and Illorsuit.

It assesses geologists from GEUS with Asiaq, writes Sermitsiaq.AG.

The newspaper is the new and novel area about five kilometers west of the mountain, which slithered down and triggered tsunami for just over two weeks ago.

This is not to say how large an area is involved.

- It is more diffuse, and therefore we can not say very precisely how large the area is. But immediately it looks a little bigger than the piece that fell, says deputy director of GEUS Flemming Getreuer Christiansen to Sermitsiaq.AG.
FNORD

Downpuppy

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Re: Tsunami from earthquakes or glacier calving?
« Reply #25 on: July 12, 2017, 07:29:52 PM »
Since there's no Stupid Questions thread in the Greenland forum : I've read that the weight of ice has pushed down the land level. Are there any studies on what happens as the ice weight is reduced? It's easy to imagine earthquakes, or even a positive feedback where rising land dumps the glaciers into the North Atlantic at a faster & faster rate.

Anyhow, just a (hopefully very unlikely) Doomsday scenario for today.

Sailaway

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Re: Tsunami from earthquakes or glacier calving?
« Reply #26 on: July 12, 2017, 10:08:55 PM »
The adjustments from the removal of thick ice from the land takes 1000's of years. For example parts of the UK are still rising from that effect. The shorter term effects of climate change on land forms are more likely to be associate with the loss of the permafrost with associated land slips. In this case there was a small quake in the region which may have acted in combination. The "Tsunami" in the thread was (in geological term) small and localized - in human terms far greater.

sqwazw

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Re: Tsunami from earthquakes or glacier calving?
« Reply #27 on: July 12, 2017, 10:21:18 PM »
Are there any studies on what happens as the ice weight is reduced?

Google: "Isostatic rebound"

Northern continental areas that were previously glaciated have good long baseline geodetic GPS surveys of this effect and many nice maps. It runs from a couple of mm's to cm's per year uplift due to the current post glacial rebound. The earths rocky crust can be thought of as "a warm plastic" and gravity induced stress and strains deform it macroscopically over the course of thousands of years after the TeraTonnes of ice have been melted away.

« Last Edit: July 13, 2017, 02:19:20 AM by sqwazw »

Downpuppy

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Re: Tsunami from earthquakes or glacier calving?
« Reply #28 on: July 12, 2017, 10:35:19 PM »
Yes, I've seen that we're in the late stages of a rebound from the last ice age, although I'm in a coastal area (New England) that's sinking. Most of the articles talk about an early, faster stage, and a slow fill in. There's references to earthquakes, volcanoes, and Iceland rising over an inch a year.

In any event, it doesn't sound like something really violent will happen soon.