Hot Spot

Hot spot volcanoes are filled by anomalously hot mantle. These mantles may be on, near to, or far from tectonic plate boundries. Most of the volcanic eruptions were caused by the movements of the near plate boundries, but an eruption of hot spot volcano is caused by hotspot(hot regions that existed below the plates) melting the plates to produce an amount of magma. An example of hot spot volcano will be the Hawaiian island, it have formed in the middle of Pasific ocean more than 3200km from the nearest plate boundary. After a long period of time of magma rising onto the sea floor, which forms an active seamount, it finally became an island volcano.

In the past 10 million years, more than a hundred hotspots beneath the Earth's crust have been active. Most of these are located under plate interiors (for example, the African Plate), but some occur near diverging plate boundaries. Some are concentrated near the mid-oceanic ridge system, such as beneath Iceland, the Azores, and the Galapagos Islands.

                                                        

Sourced by: Wikipedia, google

                     http://pubs.usgs.gov/gip/dynamic/hotspots.html