  We study two-dimensional tensorial elastic wave transport in densely
fractured media and document transitions from propagation to diffusion and to
localization/delocalization. For large fracture stiffness, waves are
propagative at the scale of the system. For small stiffness, multiple
scattering prevails, such that waves are diffusive in disconnected fracture
networks, and localized in connected ones with a strong multifractality of the
intensity field. A reentrant delocalization is found in well-connected networks
due to energy leakage via evanescent waves and cascades of mode conversion.
