The velocity anomaly in the Earth’s outer core

In the beginning of the 1990s, a concept was developed that considered that the peculiarities of differential travel times of PKPDF and PKPBC waves are related to the anisotropy of the Earth's inner core. This concept was supported by the data on splitting of the Earth's normal modes. At the same time, the experimental facts accumulated by now have not been explained within the suggested physical mechanisms causing anisotropy. The latter are based on the ordering of iron crystals either due to the deformation of the inner core caused by nonuniform growth of the core at the poles and equator or by the dendritic increase, or by the deformation of the core due to Maxwell stresses. In this work, we present the results of observations that cannot be explained by the model of anisotropy of the Earths inner core. We suggest a model of the Earth's core with a velocity anomaly of the cylindrical form in the outer core, which describes well the peculiarities of the new experimental data.