Is the lower mantle homogeneous?

Details Is the lower mantle homogeneous? Is the lower mantle homogeneous?

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgeo....1....3h&link_type=abstract

Journal of Geodynamics (ISSN 0264-3707), vol. 1, Feb. 1984, p. 3-9.

Computer Science

Earth Mantle, Earth Planetary Structure, P Waves, Seismic Waves, Geodynamics, Propagation Velocity

Scientific paper

Comparison of some array dt/dDelta studies with the global travel times of Dziewonski and Anderson (1983) leads to the conclusion that a discontinuity in the P travel times between 80 and 85 deg is consistent with both sets of data. This discontinuity in dt/dDelta corresponds to an increase in velocity of about 0.1 km/sec between depths of 2400 and 2600 km. Models of the P velocity distribution which match the Dziewonski and Anderson travel times reasonably well have the shadow zone for short-period 'diffracted' P beginning at about 110 deg arc distance.

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