Seismic observation of a high-velocity slab 1200-1600 km in depth

Details Seismic observation of a high-velocity slab 1200-1600 km in depth Seismic observation of a high-velocity slab 1200-1600 km in depth

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..369v&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, April 1988, p. 369-372. Research supported by the Keck Foundation.

Physics

25

Anomalies, Earth Mantle, Earthquakes, Seismic Waves, Seismology, Slabs, South America, Waveforms

Scientific paper

A slablike high-velocity region 1200-1600 km beneath the east coast of North America apparently has a half-width of 450 km, a lateral extent of 3000 km, and a depth extent of more than 800 km. The high-velocity anomaly has been inferred previously from travel-time studies; this study uses body-waveforms to verify and refine its structure. The anomalous region has a peak shear wave velocity 1.5 percent greater than the surrounding region and compressional velocity of 0.6 percent greater. This slab is about five times broader and five times weaker in its velocity anomaly than most slabs observed in the upper mantle.

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