A megaplume is a supermass of extremely hot rocks that moves very slowly under the surface of the earth and influences the breakup of tectonic plates.
Source: wiktionary
Megaplume
Synonyms for "megaplume"
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The rise height of a buoyant plume increases with the discharge rate of its source fluid, and all previously observed hydrothermal plumes had been found no more than a few hundred meters above their sources. The megaplume reached a stunning 1,000 meters above the ridge axis depth of 2,300 meters.
Source: wiktionary
Taken together, the two pieces of evidence could mean only one thing: the North Atlantic volcanoes were sitting atop a titanic, previously unknown hot spot, a megaplume of superheated magma rising from far down in the earth's mantle.
Source: wiktionary
As well as these small continuous sources there exist much larger-scale episodes, which give rise to the so-called ‘megaplumes’.
Source: wiktionary
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.