1. Seismological studies of the past few years (see, for example, [1, 4, 5, 8, 9]) demonstrate that the structure of the Earth's inner core is much more complex than was accepted in standard models (PREM, IASPEI91, and others). In these models, the outer/inner core boundary (ICB) is sharp with jumps in density and primary/shear wave velocity. In this paper, we present the results of measurement of different parameters of subcritical short-period PKiKP waves reflected from the ICB and give a model explanation of the peculiarities. The main conclusion is in the fact that the ICB is a region with structure, and we suggest its main elements.
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