A catastrophic glacial collapse high on a Himalaya slope triggered a violent flood wave that swept through communities along the Nepal China border, killing hundreds and leaving more than 1,300 people unaccounted for, officials and rescuers said.
U.S. Geological Survey records first registered the event as a magnitude 4.4 signal, an early indication of a sudden mass movement. Video and satellite imagery show a large portion of glacier shearing off near Langtang Lirung, a peak more than 7,000 metres above sea level. Scientists working with satellite analysis concluded an enormous block of ice and adjacent rock plunged roughly 7,000 feet down the mountainside into the river below, according to a CNN analysis and comments by Jeffrey Kargel of the Planetary Science Institute.
Satellite comparisons and on-the-ground footage suggest the detached glacier section was about 2,000 feet wide and left a 3,000-foot gash in the mountain, CNN reported. Kargel estimated the ensuing cascade of water, ice and pulverised rock raced the first 22 kilometres at an average speed of 193 kilometres per hour, covering nearly 14 miles in just under seven minutes.
Scientists and authorities have not settled on a single trigger for the collapse. The U.S. Geological Survey described the cause as a glacial collapse. Other early assessments consider a massive landslide may have taken part of the glacier with it. Researchers stress Himalayan glaciers are melting at an accelerating rate, a broader context that experts have linked to rising temperatures.
Impact Rescue Efforts And Further Risks
Rescue teams on both sides of the border face treacherous terrain, wrecked roads and bad weather. Nepali police reported at least 469 people killed in Nepal. Chinese officials reported three deaths on their side. More than 1,300 people remain missing and at least 700 foreigners were initially unaccounted for, with dozens of Americans among them according to reports.
International and local responders warned of secondary hazards. China’s Ministry of Resources said a barrier lake formed where the landslide dammed rivers, and it warned of a high risk that the dam could breach and cause renewed flooding downstream. The International Federation of Red Cross and Red Crescent Societies said responders feared further floods as they worked to reopen roads and reach isolated communities. David Fisher of the IFRC said demand for body bags had been very high and rescuers were issuing flood warnings to people still in shock.
Chinese state media reported deployment of firefighters, drones and rescue vehicles and said hundreds of tourists and villagers had been relocated. Journalists and relatives described blocked highways and disrupted supply lines into Kathmandu as authorities assess infrastructure damage and public health risks from decomposing livestock and debris.
