Scientists find evidence of a new layer at the Earth's inner core
of a new layer to the planet sitting within the inner core. This"innermost inner core" is an iron-nickel alloy ball that, as professor Hrvoje Tkalčić explains, is a"fossilized record" of Earth's ancient history. Until now, science had only recognized four layers .
The scientists found the 'hidden' core by studying seismic waves that traveled back and forth across the Earth's entire diameter up to five times — previous studies only looked at single bounces. The earthquake waves probed places near the center at angles that suggested a different crystalline structure inside the innermost layer. Effectively, the alloy is skewing the travel times for the waves as they pass through.
The findings open up new ways to investigate the inner core, according to lead author Thanh-Son Phạm. ANU also believes the innermost inner core hints at a major event in Earth's past that had a"significant" impact on the planet's heart. As researchers, it could also help explain the formation of the Earth's magnetic field. The field plays a major role in supporting life as it shields the Earth from harmful radiation and keeps water from drifting into space.
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