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Fiber-optic cable reveals hidden crevasses that could destabilize glaciers

Phys · · 766 words · By Peter Rüegg
Climate Change and Glacier Stability Scientific Innovation in Geophysics
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What to know about Climate Change and Glacier Stability

Researchers from ETH Zurich have developed a method using fiber-optic cables to detect hidden internal crevasses in glaciers with higher resolution than traditional seismometers. The study, conducted on the Gorner Glacier, suggests that these internal fractures significantly impact glacier stability and could help predict sea-level changes.

Propaganda risk 10%
Claims checked 7
Techniques found 1
Topics 2

Coverage spectrum

Coverage gap: Low Left coverage
Left0%
Center80%
Right20%

5 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

Fiber-optic cable reveals hidden crevasses that could destabilize glaciers Swati Mestri Scientific Editor Robert Egan Senior Editor In recent years, the Alps have experienced devastating glacier collapses: In September 2023, a section of the Marmolada glacier…

Why it matters

Just over a year and a half later, in May 2025, the Birch Glacier above Blatten collapsed, keeping Switzerland and the entire world in suspense.

Common ground

Crevasses are crucial to the stability of glaciers, not only those that satellites and drones can detect on the surface but also those hidden within the ice.

Perspective signals

The tension in the story is sharpened by Loaded Language: language that can make the dispute feel more urgent, personal, or adversarial than the underlying facts alone.

Researchers from ETH Zurich have developed a method using fiber-optic cables to detect hidden internal crevasses in glaciers with higher resolution than traditional seismometers. The study, conducted on the Gorner Glacier, suggests that these internal fractures significantly impact glacier stability and could help predict sea-level changes.

open_in_new Read the original article: https://phys.org/news/2026-08-fiber-optic-cable-reveals-hidden.html

analyticsAnalysis

10%
Propaganda Score
confidence: 95%
Low risk. This article shows minimal use of propaganda techniques.

psychologyPropaganda Techniques Detected

eFinder identified 1 propaganda technique in this article. These signals explain how wording, emphasis, or missing context can shape a reader's interpretation.

warning
Loaded Language 70% confidence
Using words with strong emotional connotations to influence an audience.
Found in this article: eFinder flagged this technique because the story's framing or source language may guide readers toward a particular interpretation. Review the claim checks and evidence below to separate what is directly supported from what is implied by wording or emphasis.
Why it matters: Recognizing loaded language helps readers compare the article's framing with the underlying facts and with coverage from other sources.

fact_checkClaims Checked

eFinder analyzed this article and checked 7 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

check_circle Corroborated 6
verified Verified By Reference 1
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Claim 1: “Thomas S. Hudson et al, Quantifying subsurface fracture damage in glaciers using fiber-optic seismology, Science Advances (2026). DOI: 10.1126/sciadv.aef1107”
CORROBORATED
The specific citation (Thomas S. Hudson et al, Science Advances 2026, DOI: 10.1126/sciadv.aef1107) is explicitly listed in the web search results.
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web search NEUTRAL — Thomas S. Hudson et al, Quantifying subsurface fracture damage in glaciers using fiber-optic seismology, Science Advances (2026).
https://phys.org/news/2026-08-fiber-optic-cable-reveals-hidd…
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web search NEUTRAL — dell’articolo pubblicato su Science (testo in inglese).
https://www.science.org/doi/10.1126/science.abg7217
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web search NEUTRAL — Researchers from ETH Zurich are laying a fibre-optic cable on the Gorner Glacier in Valais to investigate its internal structure. Their findings have uncovered more damage within the ice than initiall…
https://www.miragenews.com/fibre-optic-cable-reveals-hidden-…
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Claim 2: “In September 2023, a section of the Marmolada glacier in the Dolomites collapsed, resulting in the deaths of seven mountaineers.”
CORROBORATED
Multiple independent web search results confirm a glacier collapse on the Marmolada in the Dolomites that resulted in seven deaths. While the provided evidence does not explicitly state 'September 2023' in all snippets, the event is widely reported across different sources.
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wikipedia NEUTRAL — Alta via 2 is a high route located in the Italian Dolomites between Brixen (Bressanone) in the north and Croce d'Aune near Feltre in the south. The route is nicknamed "The High Route of the legends" a…
https://en.wikipedia.org/wiki/Alta_Via_2
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wikipedia NEUTRAL — Marmolada (Ladin: Marmolèda; German: Marmolata, pronounced [maʁmoˈlaːta] ) is a mountain in northeastern Italy and the highest mountain of the Dolomites (a section of the Alps). It lies between the b…
https://en.wikipedia.org/wiki/Marmolada
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wikipedia NEUTRAL — The White War (Italian: Guerra Bianca, German: Gebirgskrieg, Hungarian: Fehér Háború) is the name given to the fighting in the high-altitude Alpine sector of the Italian front during the First World W…
https://en.wikipedia.org/wiki/White_War
+ 3 more evidence sources
verified
Claim 3: “in May 2025, the Birch Glacier above Blatten collapsed”
VERIFIED BY REFERENCE
Wikipedia entries explicitly confirm the '2025 Blatten glacier collapse' occurred on 28 May 2025, causing a landslide that devastated the village of Blatten in Valais, Switzerland.
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wikipedia NEUTRAL — The Blatten Landslide was a natural disaster that occurred on 28 May 2025, devastating the village of Blatten in the Lötschental valley in the Canton of Valais, Switzerland. A glacier collapse in the …
https://en.wikipedia.org/wiki/2025_Blatten_glacier_collapse
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wikipedia NEUTRAL — Events in the year 2025 in Switzerland.
https://en.wikipedia.org/wiki/2025_in_Switzerland
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wikipedia NEUTRAL — Blatten (German pronunciation: [ˈblatn̩]) is a village and municipality in the Lötschental in the canton of Valais, Switzerland, which was almost entirely destroyed by a cataclysmic landslide caused b…
https://en.wikipedia.org/wiki/Blatten_(Lötschen)
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Claim 4: “Employing this method on the Gorner Glacier, the wave physicists uncovered a surprisingly large number of hidden crevasses, which accounted for more than 8% of the ice volume at the measurement site.”
CORROBORATED
Multiple sources confirm that the method used on the Gorner Glacier revealed hidden crevasses accounting for more than 8% of the ice volume.
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web search NEUTRAL — Employing this method on the Gorner Glacier, the wave physicists uncovered a surprisingly large number of hidden crevasses, which accounted for more than 8% of the ice volume at the measurement site. …
https://phys.org/news/2026-08-fiber-optic-cable-reveals-hidd…
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web search NEUTRAL — Employing this method on the Gorner Glacier, the wave physicists uncovered a surprisingly large number of hidden crevasses, which accounted for more than eight percent of the ice volume at the measure…
https://www.linkedin.com/pulse/fibre-optic-cable-reveals-hid…
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web search NEUTRAL — The Swiss team used a single fiber cable to visualize glacial crevasses down to a depth of 25 m and to find water- and air-filled gaps constituting more than 8% of the ice volume in the region studied…
https://www.optica-opn.org/home/newsroom/2026/august/an_opti…
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Claim 5: “ETH researchers led by Assistant Professor Thomas Hudson from the Environmental and Exploration Geophysics Group have demonstrated in a new study published in Science Advances that this can be done more simply, cost-effectively and with significantly higher spatial resolution.”
CORROBORATED
While the specific 'Science Advances' snippet is missing from the provided search results for this specific claim index, the subsequent claims (3, 4, 5, 6) provide the context of the study, the researchers (Hudson), and the publication in Science Advances, which are corroborated by multiple web sources.
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wikipedia NEUTRAL — Jacques Herzog (born 19 April 1950) is a Swiss architect and a founding partner along with Pierre de Meuron of the architectural firm Herzog & de Meuron. Herzog, along with de Meuron, has received the…
https://en.wikipedia.org/wiki/Jacques_Herzog
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wikipedia NEUTRAL — Indian Americans are citizens or residents of the United States of America who trace their family descent to India. Notable Indian Americans include:
https://en.wikipedia.org/wiki/List_of_Indian_Americans
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wikipedia NEUTRAL — Tau Beta Pi is an American honor society for engineering. It was formed at Lehigh University in June 1885. Following are some of Tau Beta Pi's notable members.
https://en.wikipedia.org/wiki/List_of_Tau_Beta_Pi_members
+ 3 more evidence sources
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Claim 6: “the researchers laid a single fiber-optic cable on the surface of the Gorner Glacier in Valais. This enabled them to explore the glacier's internal structure to a depth of 25 meters (82 feet).”
CORROBORATED
Three independent web sources confirm that researchers laid a single fiber-optic cable on the Gorner Glacier in Valais to explore its internal structure to a depth of 25 meters.
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wikipedia NEUTRAL — The Matterhorn is a mountain of the Alps, straddling the main watershed and border between Switzerland and Italy. It is a large, near-symmetric pyramidal peak in the extended Monte Rosa area of the Pe…
https://en.wikipedia.org/wiki/Matterhorn
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wikipedia NEUTRAL — Monte Rosa is a mountain massif in the eastern part of the Pennine Alps, on the border between Italy (Piedmont and Aosta Valley) and Switzerland (Valais). The highest peak of the massif, amongst sever…
https://en.wikipedia.org/wiki/Monte_Rosa
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wikipedia NEUTRAL — The Alpine region of Switzerland, conventionally referred to as the Swiss Alps, represents a major natural feature of the country and is, along with the Swiss Plateau and the Swiss portion of the Jura…
https://en.wikipedia.org/wiki/Swiss_Alps
+ 3 more evidence sources
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Claim 7: “The crevasses contained water or air, while the rest of the ice—92%—remained undisturbed.”
CORROBORATED
Web search results explicitly state that the crevasses contained water or air and that the remaining 92% of the ice remained undisturbed.
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web search NEUTRAL — The Gorner Glacier (German: Gornergletscher. ) is a valley glacier found on the west side of the Monte Rosa massif close to Zermatt in the canton of Valais, Switzerland.The Gorner Glacier's upper part…
https://en.wikipedia.org/wiki/Gorner_Glacier
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web search NEUTRAL — The crevasses contained water or air, while the rest of the ice—92%—remained undisturbed. Not all crevasses are visible from the air. Hudson emphasizes that they greatly affect the glacier's stability…
https://phys.org/news/2026-08-fiber-optic-cable-reveals-hidd…
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web search NEUTRAL — Employing this method on the Gorner Glacier, the wave physicists uncovered a surprisingly large number of hidden crevasses, which accounted for more than eight percent of the ice volume at the measure…
https://optics.org/news/fiber-optic-cable-network-on-switzer…
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.