An international team of geologists, headed by Prof Xiaodong Song from the University of Illinois at Urbana-Champaign and Nanjing University in China, has found that the Earth’s inner core has an inner core of its own, which has surprising properties that could reveal new information about our planet.

“Even though the inner core is small – smaller than the moon – it has some really interesting features. It may tell us about how our planet formed, its history, and other dynamic processes of the Earth. It shapes our understanding of what’s going on deep inside the Earth,” said Prof Song, who is a co-author of the paper published in the journal Nature Geoscience.

Scientists use seismic waves from earthquakes to scan below the planet’s surface, much like doctors use ultrasound to see inside patients. Prof Song and his colleagues used a technology that gathers data not from the initial shock of an earthquake, but from the waves that resonate in the earthquake’s aftermath.

Source: Sci-news.com - see full article