On August 26, 2026, a sudden and devastating mudslide struck the Jiulong (Gyirong) border crossing in the Jiulong County of the Tibetan Autonomous Prefecture of Shigatse, resulting in significant casualties. As of September 2nd, 21 deaths were confirmed, 541 people remained missing, and 499 evacuated residents were housed in temporary shelters.

Causes of the Disaster: Glacier Collapse, Not Heavy Rainfall

Unlike typical mudslides triggered by heavy rainfall, this disaster was caused by a glacier collapse on Nepalese territory. According to an investigation by the Ministry of Natural Resources and experts from the Chinese Academy of Sciences, the source of the disaster was located on the northern slope of Langtang Lirung mountain in Nepal, at an altitude of approximately 5,200 meters, where a large section of glacier collapsed, covering an area of 620,000 square meters.

The falling ice, rock, and debris rushed down steep valleys, carrying masses of moraine and loose sediment, quickly transforming into a massive mudslide with extraordinary destructive power. Driven by an altitude difference exceeding 3,000 meters, the mudslide reached speeds of over 50 meters per second (approximately 180 km/h) and traversed approximately 22 kilometers in just 7 minutes, reaching the Jiulong border crossing at an altitude of about 1,830 meters. Experts likened this event to a "continental tsunami." The seismic energy released by the mudslide was equivalent to an earthquake of magnitude 5.1.

Research from the Chinese Academy of Sciences indicates that precipitation in the area in the months leading up to the disaster was below average, so it was not a short-term thunderstorm event. Long-term glacier movement, spring and summer warming increasing the amount of water from ice melt, and permafrost degradation at high altitudes – all these factors could have weakened the stability of the interface between the ice and the underlying rock.

International Impact and Rescue Efforts

The Jiulong border crossing is the largest land border crossing between China and Nepal and handles over 60% of bilateral trade. The disaster also affected the Nepalese side and had cross-border implications.

Following the disaster, China deployed more than 2,300 rescuers and over 400 search and rescue vehicles to participate in search operations. On September 2nd, a temporary access route along National Road G216 to the affected central area was opened, allowing heavy equipment to enter and enabling a more detailed search of the core zone. All 499 evacuated residents were relocated to safe shelters with adequate supplies and medical care. The insurance sector preliminarily estimated the total damage at 450 million yuan (approximately 1.4 billion crowns).

Experts warn that in the context of global warming, the risk of similar glacier disasters in the Himalayan region is increasing, and they are calling for the rapid implementation of a comprehensive risk assessment system based on the analysis of three factors: "stability of the source area - erosion potential along the flow path - exposed assets and infrastructure in the valley."

LuMengya