Approximate estimates of fracture speeds for dry slab avalanches

Details Approximate estimates of fracture speeds for dry slab avalanches Approximate estimates of fracture speeds for dry slab avalanches

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3208406m&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 8, CiteID L08406

Other

2

Cryosphere: Avalanches, Cryosphere: Snow (1827, 1863), Cryosphere: Ice (1863), Cryosphere: Glaciology (1621, 1827, 1863), Physical Properties Of Rocks: Fracture And Flow

Scientific paper

Dry slab avalanches release by propagating shear fractures. It has been suggested that slab wave or fracture speed on horizontal terrain is consistent with the propagation of a flexural wave in the slab. In this note, an alternate proposal is made. Namely, it is proposed that the fracture speed is consistent with dynamic crack propagation speeds from other materials. The theory is compared with an in situ measurement of speed associated with shear fracture propagation in a weak snow pack layer sensed by geophones placed on the surface of a horizontal snow pack. The theory is shown to be consistent with the mechanical properties of alpine snow and known characteristics of slab avalanche release.

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