Further evidence against discontinuities in the outer core

Details Further evidence against discontinuities in the outer core Further evidence against discontinuities in the outer core

May 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975pepi...10...70m&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 10, Issue 1, p. 70-73.

Physics

1

Scientific paper

Short-period precursors to PKIKP are still sometimes explained as reflections from and refractions below discontinuities in the lower part of the outer core. The most recent core model with such discontinuities, published by Bertrand and Clowes (1974), is investigated with respect to the corresponding long-period precursors. Theoretical seismograms show that they would be strong enough to be observed. Long-period WWNSS seismograms for an earthquake in the New Hebrides, however, do not show them. Therefore, the discontinuities of Bertrand and Clowes' model are not real. It is concluded that the P-velocity depth function in the outer core is smooth down to the innercore boundary.

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