Abstract
BULLEN1,2 has used the Adams-Williamson relation in region B (upper 400 km in the mantle) to relate the rate of change of density in the Earth's interior to the rate of change of seismic velocity. The Adams-Williamson relation implicitly assumed that phase changes are absent. Recent interpretations of the velocity gradient in the mantle3 have re-emphasized the importance of phase changes in region C (between 400 and 900 km). Region B is often treated as a homogeneous layer, but I present here some evidence to show that phases change may also occur in this region.
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WANG, CY. Phase Change in the Upper Mantle above 350 km. Nature 227, 938–940 (1970). https://doi.org/10.1038/227938a0
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DOI: https://doi.org/10.1038/227938a0
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