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Flanagan & Shearer 1999
Flanagan, M.P. and Shearer, P.M. (1999). A map of topography on the 410-km discontinuity from PP precursors. Geophysical Research Letters 26: doi: 10.1029/1999GL900036. issn: 0094-8276.

We derive a new map of global topography on the 410-km discontinuity from observations of precursors to PP obtained by stacking almost 25,000 long-period seismograms. The inferred '410' topography exhibits average peak-to-peak amplitude of about 30 km, has a strong degree-one component, and is highly correlated with previous results obtained from SS precursors [Flanagan and Shearer, 1998>. Spatial variations in '410' topography appear unrelated to ocean-continent differences, suggesting that continental roots are not a significant factor in observed global temperature variations at 410 km depth. ¿ 1999 American Geophysical Union

BACKGROUND DATA FILES

Abstract

Keywords
Seismology, Body wave propagation, Seismology, Core and mantle
Journal
Geophysical Research Letters
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Publisher
American Geophysical Union
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