Nature Geoscience, 6, 514-515, (2013) [doi: 10.1038/ngeo1861]
News & Views -- Core processes: Earth's inner weakness
The way in which seismic waves pass through the core suggests alignment of iron crystals within the solid inner core. Experiments indicate that iron at inner-core conditions may be weaker than thought and easily allow deformation of iron crystals.
Full text of this article is available online.