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Phenomenon known as ice tsunami draws scientists’ attention for involving wind, currents, and changes in sea ice in coastal regions of the Arctic and other cold environments.
The sudden advance of large masses of ice over coastal areas, known in English as ice shove and popularly called “ice tsunami”, occurs when wind, currents, and temperature variations push accumulated ice in the water towards land.
In the Arctic, Iñupiat peoples use the term ivu to describe events where sea ice is pressed against the coast, forming walls capable of reaching beaches, roads, and buildings.
Although the nickname helps explain the visual impact, experts treat the phenomenon differently from a traditional tsunami.
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In this case, there is no water wave caused by an earthquake or sudden displacement on the seabed.
What moves is a mass of broken, compacted, or piled ice, driven by the combination of strong wind, currents, and available surface ice.
The phenomenon can occur in lakes, rivers, and coastal seas subject to seasonal freezing.
In Arctic regions, however, it receives more attention because it combines with changes in sea ice, coastal erosion, and the presence of communities that directly depend on the stability of the frozen environment for transport, hunting, protection against waves, and maintenance of structures near the waterline.
How an ice wall advances on the coast
An ice shove forms when an ice layer ceases to be trapped or stable on the water’s surface.
From there, persistent winds or currents can displace this material towards the shore.
Upon encountering land, the blocks do not dissipate like a common wave: they accumulate, overlap, and can advance over the coastal strip.
The definition used by the United States National Weather Service associates ice shove with the pushing of ice to the coast caused by wind, currents, and temperature changes.
This description differentiates the event from other winter phenomena, such as blizzards, freezing rain, or simple accumulation of stationary ice on shores and beaches.
In coastal areas of Alaska, ivu relates to the dynamics of shorefast ice.
When this layer remains thick and continuous, it can reduce the coast’s exposure to waves and storms.
When it breaks, thins, or shifts, the natural protection decreases, and the coastline becomes more subject to the direct action of wind, sea, and moving ice blocks.
What warming changes in this process
The relationship between the phenomenon and planetary warming requires precision.
There is no solid basis to state that every ice shove episode is directly caused by heat.
The event already existed before the current accelerated warming and is part of the dynamics of cold environments.
What the data indicate, according to scientific bodies, is a transformation in the conditions that influence coastal risk in the Arctic.
The extent of sea ice has decreased in recent decades, and the region has lost a significant portion of its oldest and thickest ice.
With more thin, young, or fragmented ice, frozen masses can respond differently to the action of winds and storms.
The University of Alaska Fairbanks points out that coastal communities in the state face longer periods of vulnerability to storms due to the rapid loss of sea ice.
Without the same protective cover for part of the year, waves and winds can act for longer on areas previously protected by compact ice.
NOAA, the U.S. oceanic and atmospheric agency, reported in 2025 that the Arctic’s maximum annual sea ice extent was the lowest in 47 years of satellite monitoring.
The data does not, in isolation, prove a global increase in ice shoves, but it reinforces the context of rapid change in the environment where the phenomenon occurs.
Why fragmented ice increases concern
When ice is thick and attached to the coast, its function can be similar to that of a natural barrier against waves.
In another scenario, with thinner, broken, or free-moving ice, strong winds can more easily displace plates and blocks towards the shore.
The intensity of the impact depends on local factors, such as wind direction, coastal relief, water depth, and the volume of available ice.
Research on ice push events in Alaska shows that ice displacement can push debris into elevated areas and cause erosion along stretches of coastline.
In one case analyzed in the state’s northwest, researchers recorded material carried up to 6.2 meters above mean high tide level and net erosion along about 3.5 kilometers of coastline.
The risk to constructions does not depend solely on the visible height of the ice wall.
The accumulated mass can exert enough pressure to damage light structures, block access, hit depots, fences, and equipment, in addition to hindering movement in remote communities.
In isolated areas, the loss of a structure or a route can affect transportation, supply storage, and subsistence activities.
Records of ice shove outside the Arctic also show that the phenomenon is not limited to Alaska.
In regions with frozen lakes, such as Canada and the northern United States, strong winds have pushed ice over shores occupied by houses and roads.
The difference, in the Arctic case, lies in the combination of isolation, dependence on sea ice, and environmental changes observed in recent decades.
Utqiagvik and ice monitoring in northern Alaska
Utqiagvik, in far northern Alaska, frequently appears in studies and observations on sea ice due to its location on the shores of the Arctic Ocean and as one of the northernmost inhabited areas in the United States.
The city, formerly known as Barrow, is used as a strategic point to monitor changes in climate, ice, and coastal conditions.
Researchers at the University of Alaska Fairbanks maintain projects focused on observing sea ice and the impacts of environmental changes on communities in the state.
This monitoring combines scientific data, satellite imagery, field measurements, and local knowledge from indigenous residents, who have observed ice behavior for generations.
The prediction of an ice advance still presents limitations.
To estimate the risk, teams need to assess wind, temperature, currents, the state of the frozen layer, and the shape of the coast.
Even with satellites and meteorological models, the speed of some events makes it difficult to accurately anticipate the point of impact and the intensity of the displacement.
Risk reduction measures have limits
Physical containment of a moving ice mass is difficult, especially when the accumulated volume is large.
Low walls, fences, and simple barriers may not withstand the pressure of the blocks, depending on local conditions.
Therefore, coastal risk specialists often prioritize land-use planning, monitoring, and the safe location of structures.
Houses set back from the waterline, constructions in higher areas, and evacuation routes reduce exposure.
In isolated communities, however, such changes involve high costs, logistical limitations, and cultural and historical ties to long-occupied areas.
Ice shove is also not the only risk associated with the Arctic coast.
The loss of sea ice, permafrost thaw, and coastal erosion act in combination in various regions of Alaska.
When frozen ground loses stability, foundations, roads, pipelines, and airstrips can be affected, which increases adaptation challenges for residents and local authorities.
Images of ice walls advancing over land are striking for their visual effect, but the phenomenon also helps to show how changes in sea ice can alter risks in coastal communities.
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