Summary of seismological constraints on the structure of the earth's core

Details Summary of seismological constraints on the structure of the earth's core Summary of seismological constraints on the structure of the earth's core

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9521691m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Dec. 10, 1990, p. 21691-21695.

Mathematics

Logic

37

Earth Core, Earth Planetary Structure, Seismology, Boundary Layers, P Waves, S Waves, Shear Stress

Scientific paper

The current state of the seismological constraints on core structure is reviewed. The evidence supports a simple two-layer model of the core. The fluid outer core seems to have properties which are consistent with those of a vigorously convecting region. The inner core has a sharp boundary characterized by a 0.5-0.6 g/cc density jump, a 0.6-0.7 km/s jump in P velocity, and a jump in shear velocity to 2.5 km/s or greater. There is weak evidence for an anomalously steep shear velocity gradient at the top of the inner core. Finally, the attenuation of both body waves and free oscillations indicate that the inner core is strongly attenuating near its surface though the data suggest that the attenuation is frequency dependent.

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