Natural and Man-Made Ice Vibrations in the Central Arctic Ocean in the Frequency Range from 0.1 to 100 Cps

摘要

During April and May, 1962, ice vibrations in the frequency range from 0.1 to 100 cps were measured aboard drifting ice island ARLIS II in the central Arctic Ocean. A vertical-component seismometer, which was anchored to the surface of the island, was employed as a detector. Typical displacement spectra show the following characteristics: (1) a nearly constant decrease in amplitude with increasing frequency from 2.4 x 10,000 millimicron at 0.1 cps to 1.0 millimicron at 6 cps; (2) an amplitude minimum of 0.1 millimicron between 6 and 10 cps; (3) an amplitude peak of 2 millimicron between 30 and 70 cps. (Author)