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intraplate volcanism
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Cross-sectional diagram showing three tectonic plates at ocean ridges, transform faults, and a subduction zone. The image illustrates rising magma forming rift and subduction volcanoes, convection currents in the mantle, and features such as ocean trenches, extinct and hot-spot volcanoes, and the movement of plates above a molten core and low-velocity mantle layer.
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intraplate volcanism

geology
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Cross-sectional diagram showing three tectonic plates at ocean ridges, transform faults, and a subduction zone. The image illustrates rising magma forming rift and subduction volcanoes, convection currents in the mantle, and features such as ocean trenches, extinct and hot-spot volcanoes, and the movement of plates above a molten core and low-velocity mantle layer.
volcanism and plate tectonics Stratovolcanoes tend to form at subduction zones, or convergent plate margins, where an oceanic plate slides beneath a continental plate and contributes to the rise of magma to the surface. At rift zones, or divergent margins, shield volcanoes tend to form as two oceanic plates pull slowly apart and magma effuses upward through the gap. Volcanoes are not generally found at strike-slip zones, where two plates slide laterally past each other. “Hot spot” volcanoes may form where plumes of lava rise from deep within the mantle to Earth's crust far from any plate margins.

Intraplate volcanism, also known as "hot-spot" volcanism, accounts for about 5 percent of the world's volcanoes and occurs away from plate boundaries. These volcanoes are believed to form from deep-mantle plumes that rise due to slow convection in the Earth's mantle. As a tectonic plate moves over a stationary hot spot, a chain of volcanoes can form. The volcanoes become extinct as they move away from the magma source, while new, active volcanoes form over the hot spot. The Hawaiian Islands are a prime example of this phenomenon, with progressively older islands found further from the active volcanoes on Hawaii. Some intraplate volcanoes may also result from deep fractures within plates allowing magma to reach the surface.12

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2 Britannica Sources
  1. volcano - Intraplate volcanism
  2. plate tectonics - Hotspots

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