Lamellae in D double prime? An alternative model for lower mantle anomalies

Details Lamellae in D double prime? An alternative model for lower mantle anomalies Lamellae in D double prime? An alternative model for lower mantle anomalies

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2531w&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 23, p. 2531-2534

Physics

19

Anomalies, Boundary Layers, Core Flow, Earth Core, Earth Mantle, Flow Velocity, Mathematical Models, One Dimensional Flow, Convection, P Waves, S Waves, Seismograms, Transition Points

Scientific paper

Typical 1-D velocity models of anomalies in the lowermost mantle show a positive velocity jump of 2-3% in the bottom few hundred kilometers of the mantle, the core-mantle transition zone. With synthetic seismograms it is demonstrated that a thin lamella of about 20 km thickness in D double prime can produce similar seismic signals, for P and for S waves. A reduction of the thickness and/or the velocity contrast of this lamella will render it seismically invisible. The intermittent detection of anomalies in the lower mantle could therefore be due to the intermittent existence of inhomogeneities or, if lamellae exist in D double prime, be produced by variations in their thickness, velocity contrast and/or undulation. This demonstrates the uncertaintly in our present knowledge of the D double prime structure.

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