Puzzling features deep in Earth's interior illuminated by high resolution imaging Cambridge_Uni NatureComms
Scientists use seismic waves from earthquakes to see beneath Earth's surface—the echoes and shadows of these waves revealing radar-like images of deep interior topography. But until recently, images of the structures at the core-mantle boundary, an area of key interest for studying our planet's internal heat flow, have been grainy and difficult to interpret.
They observed a 40% reduction in the speed of seismic waves traveling at the base of the ultra-low velocity zone beneath Hawaii. According to the authors, this supports existing proposals that the zone contains much more iron than the surrounding rocks—meaning it is denser and more sluggish.
With images of the ultra-low velocity zone beneath Hawaii now in hand, the team can also gather rare physical evidence from what is likely the root of the plume feeding Hawaii.
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