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There is recent evidence to suggest that the frequency dependence of the velocity and attenuation anisotropy of fluid-saturated porous media is affected significantly by the presence of fractures in general and their interconnectivity in particular.Here,we explore this phenomenon by applying a quasi-static poroelastic numerical upscaling procedure to 2D models of water-saturated rock samples containing periodic distributions of connected and unconnected fractures.For both scenarios,the symmetry of the samples,and thus the velocity and attenuation anisotropy,change with frequency.This frequency dependence can be explained by the fluid pressure diffusion between the fractures and the porous host rock as well as between connected fractures.