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Shearer PM, Flanagan MP. Seismic Velocity and Density Jumps Across the 410- and 660-Kilometer Discontinuities. Science. 1999;285(5433):1545-1548doi: 10.1126/science.285.5433.1545.
Shearer, P. M., & Flanagan, M. P. (1999). Seismic Velocity and Density Jumps Across the 410- and 660-Kilometer Discontinuities. Science (New York, N.Y.), 285(5433), 1545-1548. https://doi.org/10.1126/science.285.5433.1545
Shearer, and Flanagan. "Seismic Velocity and Density Jumps Across the 410- and 660-Kilometer Discontinuities." Science (New York, N.Y.) vol. 285,5433 (1999): 1545-1548. doi: https://doi.org/10.1126/science.285.5433.1545
Shearer PM, Flanagan MP. Seismic Velocity and Density Jumps Across the 410- and 660-Kilometer Discontinuities. Science. 1999 Sep 03;285(5433):1545-1548. doi: 10.1126/science.285.5433.1545. PMID: 10477514.
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Science. 1999 Sep 03;285(5433):1545-1548. doi: 10.1126/science.285.5433.1545.

Seismic Velocity and Density Jumps Across the 410- and 660-Kilometer Discontinuities.

Science (New York, N.Y.)

Shearer, Flanagan

Affiliations

  1. Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093-0225, USA. Lawrence Livermore National Laboratory, Post Office Box 808, L-206, Livermore, CA 94551, USA.

PMID: 10477514 DOI: 10.1126/science.285.5433.1545

Abstract

The average seismic velocity and density jumps across the 410- and 660-kilometer discontinuities in the upper mantle were determined by modeling the observed range dependence in long-period seismic wave arrivals that reflect off of these interfaces. The preliminary reference Earth model (PREM) is within the computed 95 percent confidence ellipse for the 410-km discontinuity but outside the allowed jumps across the 660-kilometer discontinuity. Current pyrolite mantle models appear consistent with the constraints for the 410-kilometer discontinuity but overpredict amplitudes for the 660-kilometer reflections. The density jump across the 660-kilometer discontinuity is between 4 and 6 percent, below the PREM value of 9.3 percent commonly used in mantle convection calculations.

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