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Most hotspot volcanoes are basaltic (e.g., Hawaii, Tahiti). As a result, they are less explosive than subduction zone volcanoes, in which water is trapped under the overriding plate. Where hotspots occur in continental regions, basaltic magma rises through the continental crust, which melts to form rhyolites.n geology, the places known as hotspots or hot spots are volcanic regions thought to be fed by underlying mantle that is anomalously hot compared with the surrounding mantle. They may be on, near to, or far from tectonic plate boundaries. Currently, there are two hypotheses that attempt to explain their origins.
Hawaiian Islands. Whilst most volcanic activity happens at plate margins, there are cases of volcanoes erupting in the middle of plates. The Hawaiian Islands are formed by volcanic activity, despite the nearest plate margin being 3,200 km away.Some geologists have suggested that a ' hot spot ' in the mantle, which remains stationary as the Pacific Plate moves over it, explains the existence of the island chain.he Hawaiian Islands are formed by volcanic activity, despite the nearest plate margin being 3,200 km away. Some geologists have suggested that a ' hot spot ' in the mantle, which remains stationary as the Pacific Plate moves over it, explains the existence of the island chain.