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- W50005067 abstract "Observations by practitioners suggest that fracture speeds are often much faster than recently reported measurements. These measurements include speeds along isolated beams ranging from 15 to 45 m/s, as well as the speed of a meadow collapse of 20 m/s. Since reported velocities appear to be slower than many observed avalanches, we analyzed a sample of 27 videos to estimate avalanche fracture speeds. Time was measured by counting video frames from the explosive trigger to visible slab fractures, and distances by on-site measurements, picture scaling, and Google Earth. Though our speeds vary widely (from 18 to 428 m/s), most of our values fall in the range of 50 to 125 m/s, which clearly exceeds previously reported values. We also investigated the relationship between fracture speed and other characteristics, such as explosive size. Interestingly, in videos with visible crowns and stauchwalls, the stauchwall opens first or at the same time 33% of the time. Our results may improve our understanding of avalanche release, as well as providing practical guidance for explosive placements." @default.
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- W50005067 date "2014-09-29" @default.
- W50005067 modified "2023-09-24" @default.
- W50005067 title "Fracture Speeds of Triggered Avalanches" @default.
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