The equation of motion of a dislocation segment is derived and its solution used to determine the contribution to the absorption of energy from an incident sound wave. It is shown that, in a representation based upon the normal modes of an extensible string, neither the line tension nor effective mass of the of the dislocation is diagonal, and the numerical values of the lowhyphen;index elements of these matrices are given. It is found, however, that this mode coupling has a negligible effect on the absorption. Additionally, for a distribution of segments of random length, the present analysis is shown to yield results in quantitative agreement with the predictions of the string model of Koehler and Granato and Luuml;cke.
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