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Nils Hählen

@nilshaehlen

Passionate about mountains and natural hazards, Head of Natural Hazards Division at the Office of Forests and Natural Hazards Canton Bern, Switzerland

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13.01.2024
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Latest posts by Nils Hählen @nilshaehlen

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A new Perspective paper in Nature Communications Earth & Environment compares the 2021 Chamoli disaster with the recent Blatten avalanche. Why did one kill >200 people while the other caused only one casualty?

Link to paper: www.nature.com/articles/s43...

06.03.2026 17:11 👍 8 🔁 3 💬 0 📌 0
A small ice avalanche, Morsarjokull, Iceland

A small ice avalanche, Morsarjokull, Iceland

🏔️❄️New book chapter on GLACIAL HAZARDS now published in ‘Comprehensive Cryospheric Science and Environmental Change’.

Covers paraglacial landslides, permafrost degradation, ice &snow avalanches, glacier detachments, GLOFs, ice-volcano interactions

Full: lnkd.in/eGtqQf8H
Pre-print: lnkd.in/ek59Swfu

04.03.2026 14:47 👍 17 🔁 7 💬 1 📌 0
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🔥📢 Call for Papers on Wildfires in a Changing #Climate: Impacts, #Adaptation, & Policy.

This Special Issue seeks submissions that examine the economic & welfare consequences of #wildfires & smoke & evaluate policy responses.

⏰ Deadline 30 Sept 2026
🔗 tinyurl.com/ryn3epjd

#OurChangingMountains

03.03.2026 14:16 👍 3 🔁 2 💬 0 📌 0
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Our February 2026 MRI Newsletter is out now!🗞️✨

Glacier news, mountain updates, new research, & community announcements from around the world. Take a look & stay connected with what’s happening in #OurChangingMountains.

🔗 tinyurl.com/MRINewslette...

#MountainResearch #ResearchFunding #ResearchNews

27.02.2026 09:23 👍 4 🔁 1 💬 0 📌 1
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Avalanche winter of 1951:
⁠They are the cheapest and most important form of avalanche protection in terms of area – and they grow back naturally: forests. What the SLF researched after the avalanche winter of 1951: www.slf.ch/en/news/aval...

#SLF #SLFDavos #Snow #Avalanche #Winter #forest

09.02.2026 11:00 👍 6 🔁 2 💬 0 📌 0
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Office Manager at ETH Swiss GeoLab ETH Zurich is establishing the ETH Swiss GeoLab, a pioneering applied research facility located in Lucerne (initially based in Zurich). The GeoLab focuses on multidisciplinary collaboration and…

The ETH Swiss GeoLab, a newly established applied research facility, is recruiting an experienced administrative professional as Office Manager. Be part of the pioneering GeoLab and contribute to its operational foundations and workplace culture.

06.02.2026 10:32 👍 2 🔁 1 💬 0 📌 0
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#Job am #SLF in #Davos: Für die Forschungsgruppe #Schutzmassnahmen suchen wir eine/n neue/n Mitarbeiter/in. Zu den Aufgaben gehören u.a. Gutachter- und Beratertätigkeit und die Planung von Schutzmassnahmen.
Alle Infos und Bewerbung: apply.refline.ch/273855/1836/...

28.01.2026 07:31 👍 3 🔁 2 💬 0 📌 0

🌄 New #MeteoSwiss research: Swiss lowlands heat up faster in autumn & winter as fog declines, while mid-elevations warm more in spring due to snow loss.

➡️ Some popular #climate datasets miss these elevation-specific signals entirely. Time-consistent, high-resolution observations matter. 🌍❄️

28.01.2026 15:58 👍 2 🔁 1 💬 0 📌 0
Professorinnen und Professoren gegen die Halbierungsinitiative – Warum wir Professorinnen und Professoren uns für einen starken Service public einsetzen und die SRG-Halbierungsinitiative ablehnen

Als direkte Demokratie braucht die Schweiz vielfältige & unabhängige Medien. Über 600 Professor:innen aus allen Sprachregionen & Disziplinen setzen sich deshalb ein für einen starken Service public und sagen «Nein» zur Halbierungsinitiative.

➡️ www.wissenschaft-fuer-den-service-public.ch

26.01.2026 15:27 👍 64 🔁 31 💬 1 📌 0
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The Blatten landslide in Switzerland In the morning of May 28, 2025, the picturesque Swiss alpine village of Blatten sat quiet and serene in the Lötschen Valley. Exceptionally quiet, in fact, as the village was evacuated on May…

Throwback Thursday ⏪ In case you missed past posts from our blog 👀

Today we are heading to Switzerland 🇨🇭, where Christophe Lambiel answers our questions about the Blatten landslide that occurred in May 2025.

Check the article to learn more about the event: blogs.egu.eu/divisions/nh...

#EGUblogs

22.01.2026 14:02 👍 5 🔁 2 💬 0 📌 1
Saleinaz Mountain Hut in the Swiss Alps is perched high above a steep slope, facing the cliffs and glaciers of Mont Dolent. The hut is small and built of stone, with a metal roof and two wooden extensions attached. Next to it is a small terrace with two tables and a few chairs. Photo by Jean Miczka.

Saleinaz Mountain Hut in the Swiss Alps is perched high above a steep slope, facing the cliffs and glaciers of Mont Dolent. The hut is small and built of stone, with a metal roof and two wooden extensions attached. Next to it is a small terrace with two tables and a few chairs. Photo by Jean Miczka.

A new article by Jean Miczka and colleagues analyzes how mountain huts in the western European Alps are being adapted to climate change, what the challenges are, and how adaptation could be improved. Recommendations include ensuring long-term coordination. Find out more: doi.org/10.1659/mrd....

13.01.2026 10:03 👍 11 🔁 4 💬 0 📌 1
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How do avalanches affect pylons and other sensitive #infrastructure? Using detailed #simulations, #SLF researcher @mjkohler.bsky.social shows that the compressibility of #snow initially reduces #avalanche pressure, but that at high speeds this buffer suddenly fails.
More: www.slf.ch/en/news/aval...

07.01.2026 09:41 👍 3 🔁 3 💬 0 📌 0
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🌡️ November 2025 was the third-warmest November on record globally, keeping 2025 on track to be the second- or third-warmest year recorded. The global three-year average temperature for 2023–2025 will likely exceed 1.5°C above pre-industrial levels for the first time. 

Read more ⬇️

11.12.2025 11:56 👍 54 🔁 41 💬 1 📌 3
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Unstable slopes and warming peaks: scientists race to understand Blatten collapse The collapse of the glacier that wiped out the Swiss mountain village of Blatten in May has triggered an unprecedented scientific effort.

The catastrophic collapse of the Birch Glacier that wiped out the Swiss mountain village of Blatten in May has triggered an unprecedented scientific effort to understand how a mountainside could break up so violently – and what might come next.

12.12.2025 15:15 👍 3 🔁 1 💬 0 📌 0
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#Job at #SLF in #Davos: We are looking for a Scientist in Integrated Modelling of #Risk Development in Global Change.
More information and application: apply.refline.ch/273855/1812/...

04.12.2025 14:53 👍 3 🔁 2 💬 0 📌 0
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#Job at #SLF in #Davos: We are looking for a #Postdoc in #climate impacts on hydrological extreme events. More information and application: apply.refline.ch/273855/1810/...

@hyclimm.bsky.social @manuelaibrunner.bsky.social

01.12.2025 13:48 👍 10 🔁 8 💬 0 📌 0
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Avalanches are of key importance to glaciers worldwide An international research team shows that avalanches contribute significantly to the health of many glaciers.

#Avalanches are of key importance to #glaciers worldwide. An international research team led by Marin Kneib (WSL & ETH Zurich) shows that up to 22% of the snow on glaciers comes from avalanches. WSL-News: www.wsl.ch/en/news/aval... @marinkneib.bsky.social @vaw-glaciology.bsky.social

26.11.2025 11:29 👍 9 🔁 7 💬 0 📌 2
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Was bedeuten Extremereignisse für die Schweiz – heute & morgen?
Unsere neue Web-App macht’s erlebbar!
Astrid hat sie am Treffpunkt Science City (ETH) vorgestellt – und besonders schön: Auch die Kinder waren begeistert dabei!
➡️ extremesapp.wsl.ch/de

11.11.2025 12:27 👍 4 🔁 1 💬 0 📌 0
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Climate change particularly pronounced in Switzerland Switzerland will become drier and hotter, experience less snow and face heavier rainfall in the future. Those are the conclusions reached by climate researchers from its Federal Office of Meteorology ...

MeteoSwiss, ETH Zurich, and C2SM present the new Swiss climate scenarios.

These show how the Swiss climate will change if the global average temperature rises by 3 degrees. ethz.ch/en/news-and-...

@meteoschweiz.ch, @usyseth.bsky.social #klimaszenarien #meteoschweiz #ETH #C2SM #NCCS

04.11.2025 10:17 👍 23 🔁 10 💬 2 📌 1
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🌍 When nature shows its force

Rockfalls, glacier collapses & debris flows are becoming more intense in a warming world. Join our VAW-glaciology group member Mylène Jacquemart at Treffpunkt Science City for her talk “Es rumort am Berg, Klimawandel und alpine Naturgefahren”

ethz.ch/de/news-und-...

03.11.2025 13:40 👍 11 🔁 5 💬 0 📌 1
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#JobAlert in #Davos: For the #SLF Alpine Remote Sensing research group we are looking for a scientific assistant. If you are interested in working with #satellite data, check the following link for more information: apply.refline.ch/273855/1787/...
#CERC

22.10.2025 14:25 👍 5 🔁 2 💬 0 📌 0
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In the red zone: New #SLF model reveals altitude-dependent #snow trends across the whole of Switzerland for the first time: average snow depths have been decreasing for decades.

More details: www.slf.ch/en/news/in-t...

📷 C. Marty, J. Götte / SLF

#climatechange

20.10.2025 13:05 👍 14 🔁 5 💬 0 📌 0

Tour de CCAMM: noch bis 10. Oktober ist die Anmeldung möglich!
Infos und Anmeldung: www.slf.ch/de/veranstal...

06.10.2025 09:27 👍 4 🔁 1 💬 0 📌 0
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The summer is over - and for about 16,600 people across 854 European cities that doesn't mean autumn comes, but death. People who would still be alive if it wasn't for our burning of fossil fuels. - New study with @lshtm.bsky.social www.imperial.ac.uk/grantham/pub...

17.09.2025 10:09 👍 155 🔁 90 💬 1 📌 10
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Incredible ice loss measured again at #Konkordiaplatz on the #Aletsch #Glacier, home to the thickest ice in the #Alps (still about 800 m!). Yesterday’s survey revealed another –4.6 m of ice gone in just one year. :(
Measurements by @matthias-huss.bsky.social for GLAMOS

16.09.2025 13:18 👍 25 🔁 12 💬 0 📌 1
Call for session proposals

Calling for EGU 2026 session proposals! If you have an idea for a geomorphology session, head to meetingorganizer.copernicus.org/EGU26/provis... and enter it in. Sessions on new topics and themes are extremely welcome! Help to build a great programme for EGU26!

20.08.2025 17:40 👍 2 🔁 4 💬 0 📌 2
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🤩New paper from our team member @cchartierrescan.bsky.social entitled 'Snow drought propagation and its impacts on streamflow drought in the Alps' published on Environmental Research Letters! Big congrats! Check out more details here: iopscience.iop.org/article/10.1...

#ClimateChange #Hydrology

27.08.2025 15:16 👍 8 🔁 4 💬 0 📌 2
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Getting used to this image: #glaciers almost completely naked - unprotected by the white snow - in August...
While July was good for glaciers after record-melt in June, the new heat wave again results in major ice loss
@vaw-glaciology.bsky.social

11.08.2025 13:21 👍 36 🔁 17 💬 0 📌 4
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Satellite radars reveal early signs of slope instability years before Blatten rock/ice avalanche - eo science for society On 28 May 2025, a massive rock/ice avalanche detached from the Birch Glacier above the village of Blatten in the Lötschental valley (Valais, Switzerland).

#Satellites reveal early signs of slope instability: #SLF scientist Andrea Manconi shows that #radar monitoring with satellites help to detect slope instabilities like at Blatten years in advance.
For details check the #ESA news article: eo4society.esa.int/2025/08/08/s...
@esa.int @esaearth.esa.int

08.08.2025 08:02 👍 11 🔁 2 💬 0 📌 0
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The Swiss Cryosphere Report 2024 is out: Despite heavy snow, Swiss glaciers lost >2% of their volume. Permafrost hit record levels as heatwaves & Saharan dust take a toll on snow & ice. 🧊📉 #Kryosphärenbericht2024 #GLAMOS @slfdavos.bsky.social #PERMOS @scnat.ch

🖇️ cryosphere.scnat.ch/de/publicati...

11.07.2025 08:39 👍 12 🔁 6 💬 0 📌 0