2015 Evidence for equatorial anisotropy of Earth’s inner-inner core
U Illinois News Release
南京大学新闻网
BBC News – Heart of Earth’s inner core revealed
Earth’s Inner Core Found To Have A Core Of Its Own
The surprising heart of the Earth’s core has been revealed, scientists say – The Washington Post
Solid inner, inner core may be relic of Earth’s earliest days | Science News
地核内核内内核：科学家发现地球核心的新结构 | 科学人 | 果壳网 科技有意思
Video: Researchers discover the Earth’s inner-inner core – NSF ScienceNow
Video: Earth’s inner core has a core of its own, scientists discover | Toronto Star
Video: BBC Children newsround
2009 Evidence for temporal changes of the Earth’s media associated with great Sumatra earthquakes
U Illinois News Release
ScienceDaily
2008 Confirmation of the Earth’s innermost inner core
Original papers:
Sun, X.L., and X.D. Song, The inner inner core of the Earth: Texturing of iron crystals from three-dimensional seismic anisotropy, Earth Planet. Sci. Lett., 56-65, doi:10.1016/j.epsl.2008.01.049, 2008.
Sun, X.L., and X.D. Song, Tomographic inversion for three-dimensional anisotropy of Earth’s inner core, Phys. Earth. Planet. Inter., 167, 53-70, doi:10.1016/j.pepi.2008.02.011, 2008.
2005 Confirmation of the inner core super-rotation
U Illinois News Release
Columbia U News Release
NSF News Release
1998 Evidence for a layered inner core structure
Original paper: Song, X.D., and D.V. Helmberger, Seismological evidence for an inner core transition zone, Science, 282, 924-927, 1998.
Columbia University News Release
1996 Evidence for the super-rotation of the Earth’s inner core
Original paper: Song, X.D., and P.G. Richards Seismological evidence for differential rotation of the Earth’s inner core, Nature, 382, 221-224, 1996.