Inner core static tilt inferred from intradecadal oscillation in the Earth’s rotation
Yachong An, Hao Ding, Zhifeng Chen, Wenbin Shen, Weiping Jiang · 2023
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Description
Yachong An and four co-authors measure a tiny wobble that reveals how Earth's inner core sits in a 2023 paper. Whether the solid inner core is tilted relative to the mantle has long been debated. The team confirmed that a rhythm of about eight and a half years in polar motion is the inner core wobble, and found the same rhythm in day length changes.
Matching the wobble's size and timing in both records, they infer a static tilt of roughly a fifth of a degree toward about ninety degrees west. That is far smaller than the ten degrees some models assumed. The tilt fits a denser northwestern hemisphere of the inner core. The wobble period also pins down the density jump at the core's boundary.
Catalog record
| CREATOR | Yachong An, Hao Ding, Zhifeng Chen, Wenbin Shen, Weiping Jiang |
|---|---|
| YEAR | 2023 |
| COLLECTION | PAPERS |
| FORMAT | TXT |
| FILE SIZE | 36 KB |
| VERSION | 1.0 |
| LICENSE | CC BY 4.0 |
| RIGHTS | CC BY |
| SOURCE | Europe PMC |