New Research Hints at Earth’s Inner Core Having its own Inner Core

By Richard Moss, Gizmag – You may have been taught in school that the Earth is composed of layers, broadly separated into a rocky crust and mantle, outside of a liquid outer core and a small, solid iron inner core. It turns out, according to new research, that the inner core may itself have a distinct internal structure – an inner-inner core about half the diameter of the whole inner core. And this could reveal insights about our planet and its history. A team composed of researchers from the University of Illinois at Urbana-Champaign and China’s Nanjing University adapted technology that gauges the strength of an earthquake. Rather than listen in on the seismic wave signals of the initial shock, they measured the waves that resonated in the aftermath of earthquakes around the world between 1992 and 2012. Seismic waves reverberate through the Earth’s layers during an earthquake, effectively...

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