read my latest post here:
There is an East-West asymmetry in the inner core seismological data. There is a model which explains this by differences at the surface of the inner core - melting in one hemisphere and crystallization in the other
did you know when talking about asymmetry that the earth's core is "anisotropic"
CRYSTAL AT THE CENTER OF THE EARTH: Anisotropy of Earth's Inner Core
This finding, confirmed only within the past two years, quickly led to the conclusion that Earth's solid-iron inner core is "anisotropic" -- it has a directional quality, a texture similar to the grain in wood, that allows sound waves to go faster when they travel in a certain direction.
updated post: http://www.energeticforum.com/148195-post137.html
just a reminder, for those interested in this thread you can print each page in pdf using a pdf printer (search google)