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Regional seismic studies of the Earth&#39;s deep mantle indicate the presence of P- and S-wave reflectors at the top of the D′′ layer. Such reflectors appear to be laterally intermittent, occur at a range of depths, and produce waveforms whose amplitude and polarity differ at different locations. A number of possible explanations for D′′ reflections have been proposed, including: a phase change from p...

The origin of D″ reflections: a systematic study of seismic array data sets