Each claim states how it is known and cites its evidence.
HypothesisA fixed deep heat source beneath a moving plate, producing an age-progressive volcanic trail.
Wilson’s hotspot hypothesis proposes that relatively small, long-lasting and exceptionally hot regions below the plates supply localised heat that sustains volcanism, and that the linear Hawaiian–Emperor chain results from the Pacific Plate moving over a deep, stationary hotspot.
- precision note: Presented by the source as Wilson’s 1963 hypothesis. Whether hotspots are rooted in deep mantle plumes remains debated — see the DISPUTED claim on hotspot origin.
Evidence support: Supported by the cited evidence · one source
Evidence: Kious 1996 · Primary authority
Established3,200 km
The vast majority of earthquakes and volcanic eruptions occur near plate boundaries, but not all: the Hawaiian Islands, entirely volcanic in origin, formed in the middle of the Pacific Ocean more than 3,200 kilometres from the nearest plate boundary.
- precision note: The stated distance is from the Hawaiian Islands to the nearest plate boundary — "more than 3,200 km" — not a general property of intraplate volcanoes.
Evidence support: Supported by the cited evidence · one source
Evidence: Kious 1996 · Primary authority
DisputedDeep-mantle plume origin for hotspots: proposed, widely used, and still disputed.
Whether hotspot volcanism originates in plumes of hot rock rooted in the deep mantle is actively contested: the proposal is long-standing and is described in the recent literature as the subject of vigorous debate.
- precision note: The dispute concerns the origin and structure of hotspot upwellings, not the existence of intraplate volcanism nor the validity of plate tectonics.
Evidence support: Supported by the cited evidence · 2 sources, multiple sources, independence unknown
Evidence: French 2015 · Peer-reviewed; Kious 1996 · Primary authority
Model outputBroad quasi-vertical conduits beneath many hotspots, from the core–mantle boundary to about 1,000 km depth.
Whole-mantle seismic imaging reveals broad, quasi-vertical conduits beneath many prominent hotspots, extending from the core–mantle boundary to about 1,000 kilometres below the surface, where some are deflected horizontally.
- model: Whole-mantle seismic waveform tomography (French & Romanowicz 2015).
- method: Combination of accurate wavefield computations with information contained in whole seismic waveforms.
- precision note: A tomographic reconstruction, not a direct image; the imaged conduits are reported as robustly broader than classical thermal plume tails.
Evidence support: Supported by the cited evidence · one source
Evidence: French 2015 · Peer-reviewed