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seismic signalsScienceDaily
•77% Informative
Geophysicists find link between seismic waves called PKP precursors and anomalies in Earth 's mantle.
The origin the precursor signals, which arrive ahead of the main seismic waves that travel through Earth 's core, has remained unclear.
Researchers say they may be the root of whole mantle plumes giving rise to hotspot volcanoes.
These plumes are responsible for the volcanism observed at Yellowstone , the Hawaiian Islands , Samoa , Iceland and the Galapagos Islands .
These ultra-low velocity zones do not just exist beneath the hotspots.
They're spread out all across the core-mantle boundary beneath North America .
The dynamics is pushing these things all across Earth , and ultimately, they're going to accumulate against the boundaries of Large Low Velocity Provinces .
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