The Gutenberg discontinuity: melt at the lithosphere-asthenosphere boundary.

@article{Schmerr2012TheGD,
  title={The Gutenberg discontinuity: melt at the lithosphere-asthenosphere boundary.},
  author={Nicholas Schmerr},
  journal={Science},
  year={2012},
  volume={335 6075},
  pages={
          1480-3
        }
}
The lithosphere-asthenosphere boundary (LAB) beneath ocean basins separates the upper thermal boundary layer of rigid, conductively cooling plates from the underlying ductile, convecting mantle. The origin of a seismic discontinuity associated with this interface, known as the Gutenberg discontinuity (G), remains enigmatic. High-frequency SS precursors sampling below the Pacific plate intermittently detect the G as a sharp, negative velocity contrast at 40- to 75-kilometer depth. These… CONTINUE READING
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