Study: Tibet debris flow at 19 m/s outpaced any runner at China-Nepal border

A peer-reviewed assessment by the Chinese Academy of Sciences found the debris flow that hit Gyirong Port in Tibet moved at 19 m/s, nearly twice Usain Bolt's average sprint speed, meaning no one could have outrun it. The finding quantifies the extreme velocity of the event, which struck a key China-Nepal border crossing, and underscores the lethal nature of such flows. The study is one of the first scientific analyses of the disaster, but details on casualties and infrastructure damage remain unclear.