The inner core of the Earth revolves and rotates

The temporal variations of the inner core seismic stages (IC) were confirmed by high quality multiples of the waveform. However, the nature of time changes remains controversial.

Geologists do not fully understand how the generator of Earth’s magnetic field works; However, assuming that it is closely related to the dynamic procedures close to the outer inner core boundary region.

A new study based on seismic data from seismic frequency and new methods of data processing revealed that the Earth’s inner core is revolving. The results can give detailed insights about the processes that control the planet’s magnetic field.

“In 1996, a small but systematic change of seismic waves passing through the inner heart was discovered by our group, which we interpreted as evidence of the differential rotation of the inner core relative to the Earth’s surface,” said Professor Geology and co-author of the study, Xiaodong Song, who now works at Peking University. However, some studies believe that what we interpret as a movement is instead the result of seismic waves that reflect the reversal and contraction of the boundaries of the inner core alternately, such as growing mountains and cutting grooves.

Scientists have reviewed seismic data from a set of geographical locations and frequency of earthquakes, called doubles, which occur in the same place over time. This allowed them to classify the signs of earthquakes that change due to the local difference in relief from those that change due to movement and rotation.

Scientists have found that some seismic waves produced by the earthquake sneak through the iron object beneath the boundaries of the inner core and change after some time, which will not happen if the inner core is fixed.

Song said, “More importantly, we see that these broken waves change before the reflected waves bounce off the boundaries of the inner core, which means that the changes are coming from inside the inner core.”

Yi Yang, a graduate student and lead author of the study, said, “What makes our analysis different is our accurate way of determining exactly when changes in seismic signals occur and reach various seismic stations around the world. We use seismic waves that have not reached the inner core as a reference wave. In our calculations, which eliminates a lot of mystery. “

Song said, “It is this accurate arrival time analysis, which is a wide range of the best quality data and Yang’s accurate statistical analysis, that gives this study its strength. This work confirms that temporal changes come mostly, if not all, from The body of the inner core, and the idea that surface changes to the inner core can be excluded is the only source of signal changes. ”

Journal Reference: Yiyang, The Origin of Temporal Changes of Internal Seismic Waves. Doi: 10.1016 / j.epsl.2020.116267

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