Distinct seismic anisotropy at the centre of the Earth

Details Distinct seismic anisotropy at the centre of the Earth Distinct seismic anisotropy at the centre of the Earth

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pepi..140..203i&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 140, Issue 1-3, p. 203-217.

Physics

4

Inner-Core, Anisotropy, Pkikp Travel Times, Axis Of Symmetry

Scientific paper

Although arrival times of PKPDF (or PKIKP) phases from epicentral distances between 120° and 173° are consistent with an anisotropy model obtained from a joint inversion of normal-mode and body-wave data, PKPDF measurements from nearly antipodal distances (between 173° and 180°) exhibit deviations from this model. We demonstrate that this behaviour is coherent, and that the characteristics associated with these data are still those of transverse isotropy. We also perform a systematic search for the location of the symmetry axis. Results suggest that the axis may be significantly tilted away from the geographic pole; however, higher-quality data are required to draw a firm conclusion. Inversion of the data with the symmetry axis at the geographic pole yields a model of anisotropy that is considerably different from that of the inner-core between 300 and 1220km radius. These observations imply that there is a seismically distinct region at the centre of the Earth with radius of about 300km.

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