seismic discontinuity

seismic discontinuity

[′sīz·mik ‚dis·känt·ən′ü·əd·ē]
(geophysics)
A surface at which velocities of seismic waves change abruptly.
A boundary between seismic layers of the earth. Also known as interface; velocity discontinuity.
References in periodicals archive ?
Others see cells originating at the 670 km seismic discontinuity, or from mid-mantle depths below the discontinuity (Cserepes and Yuen, 2000).
Since residual peridotites outcrop, the seismic discontinuity must reflect another type of boundary.
As a result of drilling, however, "everyone now agrees that the seismic discontinuity [at Galicia] is not the brittle-ductile boundary," says Winterer, of Scripps Institution of Oceanography in La Jolla, Calif.

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