Nature Geoscience, Published online: 29 June 2026; doi:10.1038/s41561-026-02027-9 Two independent studies suggest that thousands of submarine volcanoes in the Pacific Ocean and offshore Africa are likely to have resulted from two high-temperature structures in the lower mantle, whose location and morphology are influenced by plate subduction. Together, their findings imply many forms of intraplate volcanism are tied to plate tectonics through the deep mantle.