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. We study how short duration powder avalanche blasts can break and overturntall trees. Tree blow-down is often used to back-calculate avalanche pressureand therefore constrain avalanche flow velocity and motion. We find that talltrees are susceptible to avalanche air blasts because the duration of the airblast is near to the period of vibration of tall trees, both in bending androot-plate overturning. Dynamic magnification factors for bending andoverturning failures should therefore be considered when back-calculatingavalanche impact pressures.

Dynamic magnification factors for tree blow-down by powder snow avalanche air blasts