More than 800 people are now known to have died and more than 3000 are still missing following a glacier collapse on the border between Nepal and Tibet on Wednesday 26 August 2026. The incident was first recorded as a Magnitude 4.4 Earthquake by the United States Geological Survey at 2.52 am GMT, which is 8.37 am in Nepal and 10.52 am in Tibet (Tibet has been part of China since the 1950s, and China uses a single time-zone for all its territory, leading to a two-and-a-half hour time gap between Tibet and Nepal, despite their having a similar longitude), a figure which was revised to a Magnitude 5.2 event shortly after. Seven minutes after this a flash flood and debris flow hit the Gyirong Port border crossing between Nepal and Tibet, before passing along the Lhende Khola River Valley in Nepal and into the Trishuli River system.
CCTV footage of a flash flood and debris flow hit the Gyirong Port border crossing between Nepal and Tibet on Wednesday 26 August 2026. Hong Kong Standard. This event was initially interpreted as an Earthquake-induced glacier collapse, probably caused by a glacier shattering and releasing a melt-lake which had built up behind it. Such events are the most common form of glacier collapse, and are particularly associated with warming global temperatures. Essentially, glaciers begin to melt behind their leading edge, with the amount of ice in front of the growing lake slowly decreasing till the whole edifice collapses. However satellite images taken in the days before the collapse revealed no such lake, and it is now thought that a chunk of glacier with an area of about 200 000 m², and a volume of 1-2 million m³, broke off a glacier at an altitude of between 5200 m and 5400 m above sealevel, then dropped vertically about 1200 m into the valley below. This impact caused the event which the United States Geological Survey interpreted as an Earthquake.
CCTV footage of a debris flow hitting the Gyrong Port Border Crossing on Wednesday 26 August 2026. Resonoud News (响亮新闻)/Wikimedia Commons.
Approximately seven minutes after this initial collapse, the Gyirong Port Border Crossing was hit by a flood and debris flow 80 m high, travelling at approximately 180 km per hour (50 m per second). This remarkable velocity was driven largely by the steep nature of the high mountain valleys, with the Gyirong Port border crossing being approximately 3000 m lower than the initial impact point of the falling glacier. The debris flow continued down the valley for approximately 100 km, sweeping away 41 bridges and 42 km of road, as well as the Gyirong Port border crossing in Tibet and the corresponding Rasuwagadhi Customs Office in Nepal, as well as numerous homes and other buildings, and causing significant damage to six hydroelectric projects in Nepal. Bodies of victims of this flood event have been found as far away as Uttar Pradesh in northern India, more than 250 km from the initial glacier collapse event.
The remains of a bridge in Nepal swept away by the 26 August 2026 floods. Ritesh Shukla/Getty Images.
Glacier collapses are a part of the natural cycle of events within the Himalayas. The mountains here are not static, but are actively growing as the northward movement of the Indian Plate pushes up the overlying Eurasian plate. This means that glaciers which sit upon these mountains are slowly raised to ever higher altitudes, while at the same time becoming ever more steeply inclined. Eventually, this situation becomes unstable, and gravity overcomes the ability of the ice to stick to the underlying rocks, causing sections of glacier to collapse down the sides of the mountains.
This situation is made significantly worse by rising global temperatures, with the Himalayan region warming at twice the global average, which lead to higher rates of melting on glaciers in the Himalayas. The problem here is not just that the ice melts, but that when it does the water tends to percolate downward through any cracks or holes in the glacier surface, eventually pooling on the underside of the glacier. This creates a layer of liquid water over which the glacier can flow, which is the natural way in which glaciers move in lowland areas, but can lead to catastrophic consequences on high, steeply inclined glaciers.
This warming does not just threaten glaciers in these regions; many of the highest mountains are effectively rubble piles held together by ice and frozen soil (permafrost). As the Himalayas warm this ice can thaw, leading to parts of mountains breaking away, leading to more and larger landslides and rockfalls in an area where these are already a major threat to both lives and infrastructure.
Rescue efforts following the 26 August event have been greatly impacted by the loss of roads and bridges, as well as the large amounts of mud and silt left behind by the floods. Rescue workers have often had to wade through deep mud to reach communities cut off by the floods, with other communities only accessible by helicopter.
Concerns were raised about a second flood hitting the area on Thursday 27 August, after Chinese authorities discovered a barrier lake which had formed behind debris deposited at the confluence of the Chhochen Khola and Purepu Tsangpo rivers in Tibet. At the time, there was an estimated three million cubic metres of water in this lake, which had begun to overtop the barrier, leading to fears of an imminent collapse. However, this lake subsequently drained away naturally without Human interference, and had largely disappeared by Sunday 30 August.
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