Seismic observations reveal that the Earth’s inner core oscillates with a period of approximately seven decades. The multidecadal periodicity coincides with that of several other geophysical observations, particularly the variations in the length of day and the Earth’s magnetic field, suggesting dynamic interactions between the major layers of the Earth.

中文翻译：

---

几十年来地球内核的自转发生了变化，现在已经接近停止

地震观测表明，地球内核以大约七十年的周期振荡。多年代际周期性与其他几个地球物理观测结果一致，特别是白昼长度和地球磁场的变化，表明地球主要地层之间存在动态相互作用。