A serac (from

Swiss French Swiss French (french: français de Suisse or ') is the variety of French spoken in the French-speaking area of Switzerland known as Romandy. French is one of the four official languages of Switzerland, the others being German, Italian, and ...

''sérac'') is a block or column of glacial

ice Ice is water frozen into a solid state, typically forming at or below temperatures of 0 degrees Celsius or Depending on the presence of impurities such as particles of soil or bubbles of air, it can appear transparent or a more or less opaqu ...

, often formed by intersecting

crevasse A crevasse is a deep crack, that forms in a glacier or ice sheet that can be a few inches across to over 40 feet. Crevasses form as a result of the movement and resulting stress associated with the shear stress generated when two semi-rigid pie ...

s on a

glacier A glacier (; ) is a persistent body of dense ice that is constantly moving under its own weight. A glacier forms where the accumulation of snow exceeds its Ablation#Glaciology, ablation over many years, often Century, centuries. It acquires dis ...

. Commonly house-sized or larger, they are dangerous to

mountaineer Mountaineering or alpinism, is a set of outdoor activities that involves ascending tall mountains. Mountaineering-related activities include traditional outdoor climbing, skiing, and traversing via ferratas. Indoor climbing, sport climbing, an ...

s, since they may topple with little warning. Even when stabilized by persistent cold weather, they can be an impediment to glacier travel. Seracs are found within an

icefall An icefall is a portion of certain glaciers characterized by relatively rapid flow and chaotic crevassed surface, caused in part by gravity. The term ''icefall'' is formed by analogy with the word ''waterfall'', which is a similar phenomenon of t ...

, often in large numbers, or on ice faces on the lower edge of a hanging glacier. Notable examples of the overhanging glacier edge type are well-known obstacles on some of the world's highest mountains, including K2 at "

The Bottleneck The Bottleneck is a location along the South-East Spur (also known as Abruzzi Spur), the most-used route to the summit of K2, the second-highest mountain in the world, in the Karakoram, on the border of Pakistan and China. The Bottleneck is a ...

" and

Kanchenjunga Kangchenjunga, also spelled Kanchenjunga, Kanchanjanghā (), and Khangchendzonga, is the third List of highest mountains on Earth, highest mountain in the world. Its summit lies at in a section of the Himalayas, the ''Kangchenjunga Himal'', wh ...

on the border of India and Nepal. Significant seracs in the

Alps The Alps () ; german: Alpen ; it, Alpi ; rm, Alps ; sl, Alpe . are the highest and most extensive mountain range system that lies entirely in Europe, stretching approximately across seven Alpine countries (from west to east): France, Sw ...

are found on the northeast face of

Piz Roseg Piz Roseg (pronounced as ''peetse rawzech'') is a mountain of the Bernina Range, overlooking the Val Roseg in the Swiss canton of Graubünden. There are two summits on its main ridge: :*the south-east and higher summit (3,937 m) :*the north- ...

, the north face of the

Dent d'Hérens The Dent d'Hérens (4,174 m) is a mountain in the Pennine Alps, lying on the border between Italy and Switzerland. The mountain lies a few kilometres west of the Matterhorn. The Aosta hut (2,781 m) is used for the normal route. Naming The mou ...

, and the north face of

Lyskamm Lyskamm (german: Liskamm, formerly ''Lyskamm'', literally "comb of the Lys"), also known as Silberbast (literally "silver bast"), is a mountain () in the Pennine Alps lying on the border between Switzerland and Italy. It consists of a five-kilo ...

Incidents

* On a 1969–1970 Japanese expedition to

Mount Everest Mount Everest (; Tibetan: ''Chomolungma'' ; ) is Earth's highest mountain above sea level, located in the Mahalangur Himal sub-range of the Himalayas. The China–Nepal border runs across its summit point. Its elevation (snow heig ...

, Kyak Tsering was killed by a falling serac. * In 1990, an earthquake caused a block of serac to fall off

Lenin Peak Lenin Peak or Ibn Sina (Avicenna) Peak ( ky, Ленин Чокусу, ''Lenin Choqusu'', لەنىن چوقۇسۇ; russian: Пик Ленина, ''Pik Lenina''; tg, қуллаи Ленин , ''qulla‘i Lenin/qullaji Lenin'', renamed қулла� ...

, triggering an avalanche which hit a camp, killing 43 people. * In the August

2008 K2 disaster The 2008 K2 disaster occurred on 1 August 2008, when 11 mountaineers from international expeditions died on K2, the second- highest mountain on Earth. Three others were seriously injured. The series of deaths, over the course of the Friday asce ...

, the collapse of large seracs was responsible for at least 8 of the 11 mountaineers' deaths. * The April 2014 Mount Everest ice avalanche responsible for the deaths of 16 climbers was caused when a large serac broke off. * In October 2018, nine climbers from South Korea were killed at Mount Gurja basecamp in Nepal from a gust of wind, driven by falling seracs and snow. * In July 2022, a serac collapse on the

Marmolada Glacier Marmolada ( Ladin: ''Marmolèda''; German: ''Marmolata'', ) is a mountain in northeastern Italy and the highest mountain of the Dolomites (a section of the Alps). It lies between the borders of Trentino and Veneto. The Marmolada is an ultra-p ...

in Italy killed eleven people and injured eight others.

Gallery

Russell glacier Greenland Serac.JPG, Serac, Russell Glacier in Greenland WinthropGlacier06.jpg, Seracs in

firn __NOTOC__ Firn (; from Swiss German "last year's", cognate with ''before'') is partially compacted névé, a type of snow that has been left over from past seasons and has been recrystallized into a substance denser than névé. It is ice that ...

at 3,050 metres (10,000 feet) on the

Winthrop Glacier The Winthrop Glacier is a large glacier on the northeastern side of Mount Rainier in Washington. Named after Theodore Winthrop, the body of ice covers 3.5 mile2 (9.1 km2) and has a volume of 18.5 billion feet3 (523 million m3). Starting at o ...

Mount Rainier Mount Rainier (), indigenously known as Tahoma, Tacoma, Tacobet, or təqʷubəʔ, is a large active stratovolcano in the Cascade Range of the Pacific Northwest, located in Mount Rainier National Park about south-southeast of Seattle. With a s ...

in Washington,

USA The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...

Seracs_Bossons_P1090067.JPG, Seracs,

Bossons Glacier The Bossons Glacier is one of the larger glaciers of the Mont Blanc massif of the Alps, found in the Chamonix valley of Haute-Savoie ''département in France, département'', south-eastern France. It is fed from icefields lying on the northern ...

, southeastern France Seracs Glacier Bossons P1090051.JPG, Seracs, Bossons Glacier Glacier Piloto.JPG, Seracs, Piloto Glacier,

Cordillera Darwin The Cordillera Darwin is an extensive mountain range mantled by an ice field that is located in Chile. Description Cordillera Darwin is located in the southwestern portion of Isla Grande de Tierra del Fuego, entirely within the Chilean territory. ...

Tierra del Fuego Tierra del Fuego (, ; Spanish for "Land of the Fire", rarely also Fireland in English) is an archipelago off the southernmost tip of the South American mainland, across the Strait of Magellan. The archipelago consists of the main island, Isla ...

Seracs-Tangra-Mountains.jpg, Seracs at

Catalunyan Saddle Catalunyan Saddle (Katalunska Sedlovina \ka-ta-'lun-ska se-dlo-vi-'na\) is a saddle of 1260 m height in the Friesland Ridge of the Tangra Mountains on Livingston Island, in the South Shetland Islands. The saddle is bounded by Lyaskovets Peak to ...

Tangra Mountains Tangra Mountains (in Bulgarian ''Тангра планина'', 'Tangra planina' \'tan-gra pla-ni-'na\) () form the principal mountain range of Livingston Island in the South Shetland Islands, Antarctica. The range had been nameless until 20 ...

Livingston Island Livingston Island (Russian name ''Smolensk'', ) is an Antarctic island in the Southern Ocean, part of the South Shetlands Archipelago, a group of Antarctic islands north of the Antarctic Peninsula. It was the first land discovered south of 60 ...

in Antarctica

References

External links

* * Glaciology {{Glaciology-stub

Incidents

Gallery

See also

References

External links