Lateral variations near the core-mantle boundary

Details Lateral variations near the core-mantle boundary Lateral variations near the core-mantle boundary

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..609g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, June 1988, p. 609-612. NSF-supported research.

Physics

Fluid Dynamics

51

Earth Core, Earth Mantle, Seismographs, Fluid Dynamics, Pacific Ocean

Scientific paper

Amplitude behavior and differential travel times between S and SKS and between SKKS and SKS have been used to investigate lateral variations at the core-mantle boundary. Data were obtained from source regions in South America and the Fiji-Tonga area. It is found that SKS and S are anomalously separated by up to 8 seconds, and that SKS and SKKS are anomalously separated by 2-3 seconds. The results are consistent with a large scale high Vs region (2 percent increase) in the lower mantle NE of Tonga, and lateral variations in D double prime shear wave velocities of up to 3 percent.

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