Upper mantle structure beneath continents: New constraints from multi-mode Rayleigh wave data in western North America and southern Africa

Details Upper mantle structure beneath continents: New constraints from multi-mode Rayleigh wave data in western North America and southern Africa Upper mantle structure beneath continents: New constraints from multi-mode Rayleigh wave data in western North America and southern Africa

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3406309m&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 6, CiteID L06309

Statistics

Computation

1

Seismology: Mantle (1212, 1213, 8124), Seismology: Surface Waves And Free Oscillations, Seismology: Computational Seismology

Scientific paper

We estimate the averaged 1-D shear-wave velocity of the upper mantle beneath western North America and the Kaapvaal region in southern Africa by inverting dispersion measurements of fundamental and higher Rayleigh modes recorded by ~2000 km aperture broadband arrays. The overtones at periods exceeding 25 s constrain the averaged 1-D shear-wave velocity to 650 km depth across the regional arrays. Our overtone analysis confirms the shear-wave velocity differences observed in global tomographic models with similar horizontal resolution: the western North American mantle features a prominent low velocity zone at depths 50-200 km, while the shear velocity in the upper 180-200 km of the mantle beneath southern Africa is at least 6% higher than in western North America which we interpret as the expression of a cratonic keel. There is no resolvable difference in shear-wave velocity between southern Africa and western North America below a depth of about 300 km.

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