%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Marsan, D.
%A Weiss, J.
%A Larose, E.
%A Métaxian, Jean-Philippe
%T Sea-ice thickness measurement based on the dispersion of ice swell
%D 2012
%L fdi:010054384
%G ENG
%J Journal of the Acoustical Society of America
%@ 0001-4966
%K ARCTIQUE
%M ISI:000299130700021
%N 1
%P 80-91
%R 10.1121/1.3662051
%U https://www.documentation.ird.fr/hor/fdi:010054384
%> https://www.documentation.ird.fr/intranet/publi/2012/03/010054384.pdf
%V 131
%W Horizon (IRD)
%X The dispersion of flexural waves propagating in the Arctic sea ice cover is exploited in order to locally measure the ice thickness. The observed dispersion, for waves filtered in the 4-20 s period interval, at up to 4 broad-band seismometers deployed in Spring 2007 near the North Pole, is compared to a parameterized model that accounts for a complex wavefield made of a superposition of independent plane waves with different amplitudes and back-azimuth angles. The parameterization, that includes finding the best modeled ice thickness, is performed by using the cross-correlation functions between the seismometers. The ice thickness is estimated to 2.5+/-0.2 m for the similar to 1 km-large floe the seismic stations were deployed on, which is coherent with other, independent measurements at this site. This study thus demonstrates the feasibility of using broad-band seismometers deployed on the sea-ice in order to passively measure the ice thickness, without requiring active sources nor human intervention.
%$ 032