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Old 13.06.2021, 09:38
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Chamoli Disaster: Could it happen here?

Just read this amazing reconstruction of the events leading to the Chamoli disaster, and am wondering: Could it happen here? What lessons might be learned, for Switzerland and its neighbouring Alpine countries?

https://www.bbc.com/news/science-environment-57446224

Briefly: a glacial rockslide occurs. Normally such a slide stops when it hits the valley floor. After a virtual freefall of almost 2km, this particular slide is turbocharged and carries the energy of 15 atomic bombs. The airblast flattens a forest. The slide continues down the valley and continues for tens of kilometres. Two hydro-electric schemes are destroyed and 200 people are killed.

Whilst pointing out that single events cannot be attributable to climate warming, the report suggests that the frequency of rockfalls and the destabilisation of Himalayan mountain slopes is likely to increase with climate change.
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Old 13.06.2021, 09:43
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Re: Chamoli Disaster: Could it happen here?

Google Bondo, Graunbünden.

https://www.swissinfo.ch/eng/landsli...ystem/43465518
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Old 13.06.2021, 10:05
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Re: Chamoli Disaster: Could it happen here?

Or the one in 563 AD on Lake Geneva (lac Leman). In fact, this one was an underwater slide.

https://en.wikipedia.org/wiki/Tauredunum_event

"A study published in October 2012 suggests that the Tauredunum landslide triggered the collapse of sediments that had accumulated at the point where the River Rhône flows into Lake Geneva. This caused a huge underwater mudslide that displaced several hundred million cubic metres of sediment, producing a tsunami up to 16 metres (52 ft) high that reached Geneva within about 70 minutes. There is evidence of four previous mudslides, suggesting that tsunamis may be a recurrent phenomenon on Lake Geneva."
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Old 13.06.2021, 10:16
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Re: Chamoli Disaster: Could it happen here?

Goldau, 1806

Quote:
On September 2, 1806 heavy rains triggered a landslide from the Rossberg which destroyed Goldau and the adjacent villages of Buosingen, Röthen and Lauerz. The landslide comprised 40,000,000 cubic metres (52,000,000 cu yd) of material, with a mass of 120,000,000 tonnes (118,000,000 long tons; 132,000,000 short tons).[2][3]

Part of the mass hit Lake Lauerz (which had been created by an even larger landslide in the 14th century), and the resulting tsunami-like displacement wave caused more devastation towards Seewen. The event destroyed 111 houses, 220 barns, and two churches in a disaster area of about 20 km2 (7.7 sq mi), parts of which were covered with debris to a height of 30–70 metres (98–230 ft). It resulted in the confirmed death of 457 people.[2][3]
Erosion happens.
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Old 13.06.2021, 15:08
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Re: Chamoli Disaster: Could it happen here?

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Just read this amazing reconstruction of the events leading to the Chamoli disaster, and am wondering: Could it happen here? What lessons might be learned, for Switzerland and its neighbouring Alpine countries?

https://www.bbc.com/news/science-environment-57446224

Briefly: a glacial rockslide occurs. Normally such a slide stops when it hits the valley floor. After a virtual freefall of almost 2km, this particular slide is turbocharged and carries the energy of 15 atomic bombs. The airblast flattens a forest. The slide continues down the valley and continues for tens of kilometres. Two hydro-electric schemes are destroyed and 200 people are killed.

Whilst pointing out that single events cannot be attributable to climate warming, the report suggests that the frequency of rockfalls and the destabilisation of Himalayan mountain slopes is likely to increase with climate change.
….we have it every couple of years with Axenstrasse…
This link is interesting: https://www.wsl.ch/en/newsseiten/06/...of-damage.html
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Old 13.06.2021, 16:31
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Re: Chamoli Disaster: Could it happen here?

Minor league stuff compared to Italy, 1963:

"During the filling of the reservoir a block of approximately 270 million cubic metres detached from one wall and slid into the lake at velocities of up to 30 m/sec (approx. 110 km/h). As a result a wave over topped the dam by 250 m and swept onto the valley below, with the loss of about 2500 lives. Remarkably the dam remained unbroken by the flood."

https://blogs.agu.org/landslideblog/...slide-of-1963/

Tom
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Old 13.06.2021, 16:41
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Re: Chamoli Disaster: Could it happen here?

Rock falls and avalanches occur uncomfortably often, including here, but the precursor signs are unlikely to go unnoticed nowadays. The area in India had been moving unnoticed for (at least?) four years by tens of meters. The Swiss Alps howver are surveilled fairly closely, the consequences of such an event ocurring here are far to severe to not keep watch.

For instance in Horlaui, on the Vierwaldstättersee, a few houses were ordered evacuated permanently because the situation had become too dangerous. They should have been demolished by now.
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Old 13.06.2021, 17:25
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Re: Chamoli Disaster: Could it happen here?

A peak at the current science from 5:00, Bondo from 7:00 and the Obertsdorf crack at 10:00
https://www.dw.com/en/alpine-twiligh...rs/av-49804299


And the Swiss view:

https://www.slf.ch/en/permafrost/per...l-hazards.html
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Old 13.06.2021, 21:18
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Re: Chamoli Disaster: Could it happen here?

ladies and gentlemen, welcome to the Landslide Blog https://blogs.agu.org/landslideblog/
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