Open AccessA name for D”
Author(s) -
Bolt Bruce A.
Publication year - 2000
Publication title -
eos, transactions american geophysical union
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.316
H-Index - 86
eISSN - 2324-9250
pISSN - 0096-3941
DOI - 10.1029/00eo00285
Subject(s) - section (typography) , geology , mantle (geology) , subdivision , mathematics , geometry , geography , geophysics , computer science , archaeology , operating system
Several additional points may be of interest concerning the recent Eos correspondence on appellations for the much‐studied Earth's regions denoted D″ and F by K. E. Bullen. These relatively thin shells were subdivisions made by Bullen on the basis of the P velocity inversion in 1939 by H. Jeffreys. Jeffreys [1938, p. 285] was certainly aware of C. G. Dahms publications, presenting evidence for a shell of almost constant P velocity at the base of the mantle, but he refrained from fixing any name to it. Bullen [1947, p. 207] specifically relates in the first edition of his book that Dahm and J. B. Macelwane provided independent evidence that there may be a separate layer of thickness 100–200 km above the boundary of the central core.