Earth has inner core surface property variations at 1km scale

  • Thread starter verdigris
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Main Question or Discussion Point

A Wikipedia article says:
"The surface of the inner core exhibits rapid variations in properties at scales at least as small as 1 km. This is puzzling, since lateral temperature variations along the inner core boundary are known to be extremely small (this conclusion is confidently constrained by magnetic field observations)."

Why do small temperature variations correspond with relatively large variations in the properties? What is the explanation for this?
 

Answers and Replies

311
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"relatively large variations in the properties"

what properties and what is large ?
 
matthyaouw
Gold Member
1,137
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What technique do they use to look at the core which has a resolution of 1km? As far as I know the best we can manage with the mantle is 100 or so.
Also, which article?
 
4,453
57
Good question.Can't find anything on that.

We have

http://www.gps.caltech.edu/~dla/Commentary-doc2.pdf [Broken]

Earth by the low viscosity fluid outer core and it can rotate, nod, wobble, process, oscillate, and even flip over, only loosely constrained by the surrounding shells.
That's our concern. although "process" should be "precess". The question is, what that does to the Earth as a whole.

like this:
http://earth.leeds.ac.uk/~earmdu/agu03.pdf [Broken]
 
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118
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The article in wikipedia is here:http://en.wikipedia.org/wiki/Inner_core
in the third paragraph that starts "little is known.." (below the diagram of the Earth).
 

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