THERMAL TENSION CRACKING IN SEA ICE: A SOURCE OF UNDERICE NOISE

Authors
  1. Milne, A.R.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN)
Abstract
A summary is given of the important observations that relate the rheological properties of sea ice to the occurrence of surface tension cracks and explain how the noises produced by myriad surface cracks are observed under the ice. Ice-cracking noise is expected where the surface of the sea ice is cold and has a sufficiently low salinity to approximate a brittle solid. This condition is more likely to occur in seas covered by a high percentage of multi-year ice and where wind-mixing in leads was absent when the seas congealed. The acoustic water waves observed from crack-excited plate waves are described and two examples of single-frequency Crary wave arrivals are shown.
Report Number
REPR-72-4 —
Date of publication
15 Apr 1972
Number of Pages
16
Reprinted from
J of Geophysical Research, vol 77, no 12, 1972, p2177-2192
DSTKIM No
72-04667
CANDIS No
15282
Format(s):
Hardcopy;Originator's fiche received by DSIS

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