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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.
A hotspot is an area in the Earthâs mantle from which hot plumes rise upward, forming volcanoes on the overlying crust. The best example of a hotspot producing a line of volcanic islands is the Hawaiian hotspot. This drawing, from Thurmanâs Introduction to Oceanography, illustrates how the Hawaiian chain formed as the Pacific tectonic plate moved over the hotspot.