Possible heterogeneity of the Earth's core deduced from PKIKP travel times

@article{Poupinet1983PossibleHO,
  title={Possible heterogeneity of the Earth's core deduced from PKIKP travel times},
  author={Georges Poupinet and Robert Pillet and Annie Souriau},
  journal={Nature},
  year={1983},
  volume={305},
  pages={204-206}
}
The core of the Earth is usually described by spherically-symmetrical velocity models. The core is made of two main spherical layers: the fluid outer core with a radius close to 3,480 km and a P-velocity increasing with depth from 8 km s−1 to 10.3 km s−1, and the solid inner core with a radius of 1,220 km and a P-velocity close to 11 km s−1 (refs 1, 2). Station residuals of the seismic core phase PKIKP have been computed for 400 seismological observatories worldwide using 5 yr of the… 

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References

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Travel times and amplitudes of PKP, P2KP and higher multiple K phases are determined from a worldwide distribution of short-period seismograms. The sources are one explosion in Novaya-Zemlya and

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Long-period energy preceding the PKPDF branch on long-period seismograms was identified as resulting from diffraction from the PKP caustic B. This conclusion is based on the measurements of the