  Dynamics of an array of line defects interacting with a background elastic
medium is studied in the linear regime. It is shown that the inertial coupling
between the defects and the ambient phonons leads to an anomalous response
behavior for the deformation modes of a defect-lattice, in the form of
anisotropic and anomalous mass and elastic constants, resonant dissipation
through excitation of phonons, and instabilities. The case of a single
fluctuating line defect is also studied, and it is shown that it could lead to
formation of shock waves in the elastic medium for sufficiently high frequency
deformation modes.
