Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; December 1964; v. 54; no. 6A; p. 1797-1809
© 1964 Seismological Society of America
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Resonances in seismic noise under arctic sea-ice

A. R. MILNE and S. R. CLARK

PACIFIC NAVAL LABORATORY DEFENCE RESEARCH BOARD OF CANADA, VICTORIA, BRITISH COLUMBIA

Abstract

Spectrograms of underwater seismic noise between 0.2 and 2.0 cps from the bottom of relatively shallow ice-covered seas show a line structure which indicates that vertical resonances occur within layers bounded at depth by the Mohorovicic discontinuity. The line structure appears with most clarity when recognizable transients are excluded. Under these quasi-stationary noise conditions, measurements of pressure spectra indicate that the seismic noise of the observed level can be generated by a vertical bobbing of the ice field as a whole.






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