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Uploaded on Feb 12, 2010
A classic explanation for oceanic hot spots such as Hawaii has been that they originate from upwellings of hot rock, called mantle plumes,deep in the Earths mantle. Evidence for these deep structures has been sketchy, however. Now, Carnegie scientists have used a sophisticated array of seismometers deployed on the sea floor around Hawaii to obtain the first high-resolution seismic images of a mantle plume extending to depths of at least 1,500 kilometers (932 miles).