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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.
The plate on which a volcanic island sits is moving, but the mantle. plumes stay in one place. The top of an established mantle plume is. called a hot spot. As the plate moves, it carries the volcanic island. away from the hot spot that formed it. Without the hot spot to. supply magma, the volcano becomes extinct.