Scientists Identify 3,100 Surging Glaciers as Global Risk

Portsmouth, April 17, 2026 — Scientists have identified more than 3,100 “surging glaciers” worldwide capable of triggering floods, avalanches and other hazards, with new research warning that climate change is making these sudden ice movements increasingly unpredictable and potentially more dangerous for communities in high-risk regions.

The global study, led by the University of Portsmouth and published in Nature Reviews Earth and Environment, provides one of the most comprehensive assessments to date of surge-type glaciers—an uncommon category that behaves differently from typical glaciers, which steadily retreat due to rising temperatures.

Global distribution and scale of surging glaciers

The research compiled data on over 3,100 glaciers known to experience surges, revealing that while they account for only about 1% of all glaciers globally, they influence nearly one-fifth of the total glacier-covered area. These glaciers are not evenly distributed, with 48% located in the Arctic and sub-Arctic and 50% concentrated in High Mountain Asia.

Key clusters were identified in regions such as the Karakoram Mountains, the Andes and polar environments. These locations combine climatic and geological conditions that allow glaciers to accumulate ice over long periods before releasing it rapidly during surge events.

Researchers also identified 81 glaciers that pose the highest risk due to their size, proximity to populated areas and history of repeated surging. Many of these high-risk glaciers are situated in the Karakoram region, where valleys and infrastructure lie directly downstream.

Mechanism behind sudden glacier surges

Unlike typical glaciers that move gradually, surging glaciers can accelerate dramatically, pushing large volumes of ice forward over a short period. These events can last several years and are often separated by long intervals of relative stability.

The study explains that these glaciers behave like a storage system, gradually accumulating ice before releasing it rapidly. During a surge, ice movement speeds increase significantly, causing the glacier front to advance and potentially disrupt surrounding landscapes.

This cyclical behavior makes surging glaciers particularly difficult to predict, as the timing and intensity of surges depend on complex internal and environmental conditions.

Six major hazards threatening nearby communities

The study outlines six primary hazards linked to glacier surges, all of which can have severe impacts on human settlements and infrastructure. These include glacier advances that can overrun roads, farmland and buildings, and river blockages that form unstable lakes capable of sudden outburst floods.

Additional risks include meltwater floods emerging from beneath glaciers, sudden detachments that trigger large ice and rock avalanches, and widespread crevassing that creates dangerous terrain for travel and tourism. In coastal areas, surging glaciers can release large numbers of icebergs, posing hazards to shipping and marine activity.

These hazards are particularly significant in mountainous regions where communities depend on glacier-fed water systems and transportation routes that pass through glacier terrain.

Climate change increasing unpredictability

The findings indicate that climate change is altering the behavior of surging glaciers, making their activity less predictable. Rising temperatures and extreme weather events such as heavy rainfall and unusually warm summers are increasingly linked to earlier or unexpected surges.

The study notes that the effects vary by region. In some areas, surges are becoming more frequent, while in others they are declining as glaciers thin and lose the capacity to build up sufficient ice. This variability complicates efforts to forecast future activity.

In regions such as Iceland, rapid glacier shrinkage may lead to a decline in surging activity. Conversely, parts of High Mountain Asia and the Arctic—particularly in Canada and Russia—could experience more frequent surges due to increased meltwater and changing climate conditions.

The research also highlights the possibility that surging glaciers could emerge in new regions, including the Antarctic Peninsula, as environmental conditions evolve.

Need for monitoring and risk management

Scientists emphasize that improved monitoring and forecasting systems are essential to manage the risks associated with surging glaciers. The study calls for expanded satellite observations, increased field measurements and more advanced modeling to better understand surge mechanisms and predict future events.

Accurate identification of high-risk glaciers is seen as critical for protecting vulnerable communities, particularly in regions where infrastructure and settlements are located close to glacier fronts.

The research underscores that while understanding of glacier surges has improved, climate change is rapidly altering the conditions that drive them. This creates an urgent need for enhanced surveillance and preparedness strategies to reduce the potential for disaster.

With thousands of surging glaciers already identified and environmental conditions continuing to shift, the study highlights a growing challenge in managing glacier-related hazards in a warming world.