Mathematics – Logic
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.305..204p&link_type=abstract
Nature (ISSN 0028-0836), vol. 305, Sept. 15, 1983, p. 204-206.
Mathematics
Logic
76
Earth Core, Earth Planetary Structure, P Waves, Seismic Waves, Earth Mantle, Propagation Velocity, Spherical Harmonics, Wave Propagation
Scientific paper
The latitudinal PKIKP velocity differences measured by seismic stations at the poles and at the equator are demonstrated to reveal a variation from spherical symmetry of the P-velocity distribution near the earth's inner core boundary. A total of 5 yr of fluid outer core and inner solid core P-velocity data recorded by International Seismological stations were analyzed. PKIPK waves enter the core during earthquakes, and are identified by arrival times at seismic stations. The data were formatted into arrival time cells of 0.2 sec and 0.5 deg. A spherical harmonic expansion was performed to degree 4 to filter the PKIPK field. Slow regions were revealed near the equator and the fastest velocities were exhibited in Arctic regions. It is noted that an elongated core near the poles could explain the differences in arrival times.
Pillet Robert
Poupinet Georges
Souriau Annie
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