Using seismic imaging, scientists have discovered that an ancient ocean floor may encroach upon the Earth’s core, possibly dating back millions of years.
The team investigates how this buried layer of material came to be and finds it sits at the core-mantle boundary (CMB) between the outer core and the silicate rock mantle.
At the boundary sit ultra-low velocity zones (ULVZ) due to their ability to slow down seismic waves.
Previous work had suggested that these zones were created by volcanos, but until now, scientists had been unsure how they came to exist.
The current study explains how they got ULVZs.
According to the research team, using a technique called ultrasound, which uses seismic waves generated by earthquakes to produce an image of the southern hemisphere interior, they found anomalous zones of material at the CMB in every region they probed. .
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