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Mapping the mantle

The geophysicists measured the speed of sound in the mantle to depths of 340 km beneath Asia, North and South America and Australia. By combining a large set of data in a form of tomography, they were able to build up velocity maps of the mantle beneath these continental land masses. "Using seismic hum, estimation of Earth's structure is not limited by spatial distribution of earthquakes," Kiwamu told

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