初步调查显示，尼泊尔-西藏边境发生的致命山洪由冰川崩塌引发，而非最初猜测的地震 13。美国地质调查局报告，此次冰川崩塌产生的冲击力相当于5.2级地震 12。大量冰岩碎屑涌入河流，导致下游水位在30分钟内暴涨7至9米 12。此次灾害的伤亡情况，有报道指出已造成至少177人死亡 1，另有报告称至少273人遇难且超过1300人失踪 2。
发生崩塌的冰川位于尼泊尔Langtang Lirung峰附近，距洪灾地点约15公里 1。初步调查还显示，灾害可能是由冰川大块断裂并暂时堵塞河流后溃决引发的，但具体原因尚未确定 23。科学家警告，喜马拉雅地区升温速度明显快于全球多数地区，冰川正因气温上升和气候变化加速融化 123。相关分析指出，自2000年以来该地区冰川的融冰速率已翻倍 12。联合国报告指出，2000至2019年间该地区冰川每年损失267吉吨冰，且约78%的冰川面积位于海拔4500至6000米之间，高度暴露于变暖影响 2。尽管尚不能直接将此次灾难与全球变暖挂钩，但此类灾害的风险正在增加 2。此外，尼泊尔约10%的电力生产位于受灾山谷，而当前全球政策使地球到本世纪末的升温轨迹约为2.8摄氏度 2。作为历史参考，2021年印度Chamoli山谷的冰川崩塌曾造成200人死亡 1。
Flash floods triggered by a glacier collapse at the Nepal-Tibet border have caused massive devastation, with at least 177 people confirmed dead according to one report 1, while another report states that at least 273 people have died and over 1,300 remain missing 2. The floods occurred on a Wednesday in Nepal, initially leading authorities to suspect an earthquake 23. However, the United States Geological Survey (USGS) confirmed that the catastrophe was caused by a "glacier collapse," which involves the disintegration of a glacier or a portion of it, rather than seismic activity 13. Preliminary investigations suggest the disaster occurred when a massive chunk of ice broke off, temporarily damming a river before bursting 2.
The collapsed glacier was located near Nepal's Langtang Lirung peak, approximately 15 kilometers from the flood site 1. The collapse generated a massive impact force equivalent to a magnitude 5.2 earthquake, according to the USGS 12. This immense force sent a massive surge of ice and rock debris into the river, causing water levels downstream to rise by 7 to 9 meters, or up to 29.5 feet, within just 30 minutes 12. While the USGS confirmed the mechanism, the exact cause of the glacier collapse remains undetermined 3. The flooding severely impacted the valley, which accounts for approximately 10% of Nepal's electricity production 2.
Scientists warn that rising temperatures and climate change are accelerating the melting of Himalayan glaciers, increasing the frequency of such disasters 13. An analysis by the International Centre for Integrated Mountain Development (ICIMOD) indicates that the melting rate of Himalayan glaciers has doubled since 2000 1. A United Nations report highlights that glaciers in the region lost 267 gigatons of ice annually between 2000 and 2019 2. Furthermore, about 78% of the glacier area in the region is situated between 4,500 and 6,000 meters in elevation, making it highly exposed to warming effects 2. Current global policies put the Earth on a trajectory to warm by approximately 2.8 degrees Celsius (5 degrees Fahrenheit) by the end of this century 2. Highlighting the growing regional risks, a similar glacier collapse in India's Chamoli valley in 2021 resulted in 200 fatalities 1.
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