Evidences for a low-velocity core-mantle transition zone

Details Evidences for a low-velocity core-mantle transition zone Evidences for a low-velocity core-mantle transition zone

Jun 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973pepi....7..199i&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 7, Issue 2, p. 199-202.

Physics

2

Scientific paper

Using the spectral ratios P/PcP,ScSn+1/ScSn,sScSn+1/sScSnandSKS/ScS, models for the core-mantle boundary are found. The models have close similarity with each other, implying an irregular surface with lateral variation in the core-mantle properties. The models are characterized by two to four low-velocity, high-density layers imbedded between the mantle and the core half space. The velocities of the imbedded layers decrease towards the core boundary with a lower bound of 9.3 km/sec for the compressional wave and 3.5 km/sec for the shear wave. The models fitted to the empirical data support the hypothesis of a finite rigid outer core with a higher bound for the shear velocity of 1.4 km/sec. Based on this finite rigidity in the outer core and a layered core-mantle transition zone, the value of Q for the whole mantle is 2,000. For the outer core Q ranges from 100-1,000 , which may indicate that it is chemically zoned.

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