Peculiarities of the sensitivity kernels of PKIKP and PKIIKP waves in the Earth's inner core

The sensitivity kernels in the Earth’s inner core for PKIKP and PKIIKP waves using the DSM Kernel Suite algorithm and 128 processor cores were calculated. In the calculation process, a database of 725634 strain Green’s tensors was created. It is estimated that the thickness of the sensitivity tube for the PKIKP wave in the upper part of the inner core is about 200 km. It is shown that in the antipode, the inhomogeneities at the base of the outer core have a much greater effect than inhomogeneities in the inner core for the PKIIKP waves travel times under the condition of uniform volume. It was demonstrated that the inhomogeneities of the shear wave velocity in the source region cause stronger oscillations in the fragment of the seismogram containing the PKIIKP wave in the antipode than the inhomogeneities in the upper part of the inner core under the same condition.