Is there an observable lack of reciprocity in PKP(DF) traveltimes?

Details Is there an observable lack of reciprocity in PKP(DF) traveltimes? Is there an observable lack of reciprocity in PKP(DF) traveltimes?

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000geoji.143..274m&link_type=abstract

Geophysical Journal International, Volume 143, Issue 1, pp. 274-277.

Astronomy and Astrophysics

Astronomy

Inner Core Anisotropy, Pkp(Df), Seismic Traveltimes

Scientific paper

On average, traveltimes of PKPDF for equatorial ray paths through the quasi-eastern hemisphere of the inner core are around 0.5s faster than equivalent ray paths through its quasi-western hemisphere. In these observations, the eastern hemisphere is sampled primarily by westward- and the western hemisphere by eastward-propagating waves. Noting that westward propagation is faster than eastward propagation inside a rotating earth, I estimate the expected traveltime difference from Coriolis splitting of the displacement eigenfunctions of the PKPDF-equivalent modes. It turns out that Coriolis effects are too small to give rise to residuals of the required magnitude. Thus, the observations must be primarily due to velocity heterogeneities.

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