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Detailed Reference Information |
Sylvander, M. and Souriau, A. (1996). P-velocity structure of the core-mantle boundary region inferred from PKP(AB)-PKP(BC) differential travel times. Geophysical Research Letters 23: doi: 10.1029/96GL00586. issn: 0094-8276. |
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PKP(AB)-PKP(BC) differential travel time residuals from the bulletins of the International Seismological Centre are inverted to retrieve the P-velocity anomalies in the lowermost 300 km of the mantle. We show that a realistic core-mantle boundary (CMB) topography may have only a marginal contribution to the residuals. The block parametrization used allows us to discard poorly sampled areas prior to a least-squares inversion. The main features are negative anomalies beneath Eurasia and North America and a positive anomaly beneath the Southwest Pacific. The inferred map is not consistent with other maps resulting from previous P- and S-velocity studies, which are correlated at long wavelengths with each other. The preferred explanation for this challenging inconsistency is the presence of a thin heterogeneous layer just above the CMB. ¿ American Geophysical Union 1996 |
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Abstract |
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Keywords
Seismology, Core and mantle, Tectonophysics, Dynamics of lithosphere and mantle—general |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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