The Kolka glacier in North Ossetia is actively advancing and could reach a massif of dead ice within five to six years at its current speed, according to the Institute of Geography of the Russian Academy of Sciences.
Russian news agency TASS reported that scientists warn the forward movement of the glacier could trigger micro-surges and hazardous mudflows in the surrounding alpine valleys.
The findings follow a scientific expedition conducted in September 2026, which discovered that the tongue of the glacier had advanced by 50 meters toward the dead ice massif. The remaining block of stagnant ice constitutes the tail of the glacier left behind after a catastrophic collapse in 2002.
Gennady Nosenko, who led the research expedition, said the situation at Kolka required continuous monitoring. He emphasized that the ice body remained one of the most unpredictable natural objects in the Caucasus region.
Glacier dynamics and micro-surge risks
Glacier tongues represent the elongated front sections of glaciers extending down mountain slopes. When active glacier ice moves forward into stationary deposits known as dead ice massifs, structural pressure can build rapidly along the contact zone.
In glaciology, dead ice refers to stagnant ice masses that no longer flow with the main glacier body and are often covered by rock debris. The collision between advancing ice and dormant structures can release trapped meltwater and destabilize steep valley slopes.
These interactions frequently cause localized micro-surges and trigger mudflows. Mudflows are fast-moving torrents of water, mud, and pulverized rock that can travel down mountain channels at high speeds, posing severe risks to downstream infrastructure.
Monitoring the North Ossetia ice field
The Kolka Glacier is situated in the Republic of North Ossetia, a mountainous federal subject of Russia located on the northern slopes of the Greater Caucasus range. The region features steep terrain where glaciological changes can quickly impact surrounding mountain passes.
The glacier gained international attention in September 2002 after suffering a catastrophic collapse that sent millions of tons of ice and rock tearing through local valleys. The disaster reshaped the local landscape and left behind the remnant dead ice tail that researchers are tracking today.
Researchers from the Institute of Geography, the leading geographic research center within the state-funded Russian Academy of Sciences, plan to maintain regular observation of the glacier as its tongue continues to close the gap toward the remnant ice field.
