Velocity structure near the inner core boundary from waveform modeling

Details Velocity structure near the inner core boundary from waveform modeling Velocity structure near the inner core boundary from waveform modeling

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.6573s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. B5, May 10, 1992, p. 6573-6586.

Physics

26

Earth Core, Earth Mantle, Earth Planetary Structure, Seismic Waves, Waveforms, Boundary Value Problems, Mathematical Models, P Waves, Wave Equations

Scientific paper

Attention is given to a velocity model of the inner core boundary (ICB) region developed from broadband waveform modeling. The data consist of long- and short-period record sections gathered from the U.S. arrays, WWSSN, and LRSM. Deep events beneath Indonesia were used; these sampled the ICB structure beneath the North Pacific. The present preferred model was developed from modifications of the Preliminary Reference Earth Model (PREM). It contains a relatively large gradient above the ICB, a sharp jump at the ICB of about 0.78 km/s, and a relatively large gradient underneath. These features are constrained largely by the differential travel times and amplitude ratios of PKIKP and PKiKP of the short-period section. The modeling results suggest a low-velocity gradient at the bottom (roughly 400 km) of the fluid core. This model indicates possible inhomogeneity above the IC, as suggested in the literature.

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