The Crystal at the Center of the Earth
http://www.psc.edu/science/Cohen_Stix/cohen_stix.html
The web page briefly discusses the work of Ronald Cohen and Lars Stixrude
of the Carnegie Institution of Washington. They performed calculations
using a CRAY 90 to predict properties associated with different
hypothesized iron crystal structures. (The web page is at the Pittsburgh
Supercomputing Center where the CRAY 90 is located.)
Damien R. Sullivan said:
>last I heard someone was saying the core doesn't rotate at the same rate
>as the rest of the Earth
If interested, here are two Science News articles about this:
http://38.214.184.12/sn_arch/7_20_96/FOB1.HTM
http://38.214.184.12/sn_arch/10_19_96/BOB1.HTM
A more academic reference reviewing the field of "Seismology of the core"
1991-1994 (Anders gave a pointer into this web document):
http://earth.agu.org/revgeophys/tromp01/tromp01.html