Interpretation of a few ice event transients

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Abstract
This article discusses some of the observables important to the study of sound radiated into the water by ice fracturing events. Such studies are important in order to understand the mechanisms of Arctic Ocean ambient noise generation. Theoretical work for a homogeneous ice plate indicates that there are three important paths of elastic wave propagation over which energy travels away from an ice event source. These are the flexural wave in the ice, the longitudinal wave in the ice, and the acoustic wave in the water. Each has a distinctive propagation speed, attenuation, and associated pressure field in the water. The experimental work, consisting of the interpretation of four ice events, supports the theoretical description. In each case the event is located and the contributing wave paths identified. In all cases the acoustic wave dominates. The work also demonstrates how event analysis can be used to determine ice properties.

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