How are earthquakes and volcanic activity related to plate boundaries?

Hawaii is located over a hot spot, or a hot plume of magma that has pushed its way through the crust. There's actually a long chain of volcanoes (the Hawaii-Emperor Seamount Chain) starting with the Big Island of Hawaii, where the youngest volcanoes are, and running northwest all the way across the Pacific Ocean up to the western end of the Aleutian Islands. Only the islands of Hawaii are still above water...the others have been eroded away when the Pacific Plate's motion carried them off of the hot spot and their volcanism died out.

I hope that helps. Good luck!

...Although most volcanic rocks are generated at plate boundaries, there are a few exceptionally active sites of volcanism within the plate interiors. These intraplate regions of voluminous volcanism are called hotspots. Twenty-four selected hotspots are shown on the adjacent map.

Most hotspots are thought to be underlain by a large plume of anomalously hot mantle. These mantle plumes appear to be generated in the lower mantle and rise slowly through the mantle by convection. Experimental data suggests that they rise as a plastically deforming mass that has a bulbous plume head fed by a long, narrow plume tail.

As the head impinges on the base of the lithosphere, it spreads outward into a mushroom shape. Such plume heads are thought to have diameters between ~500 to ~1000 km. Many scientists believe that mantle plumes may be derived from near the core-mantle boundary, as demonstrated in this computer simulation from the Minnesota supercomputing lab.

Note the bulbous plume heads, the narrow plume tails, and the flattened plume heads as they impinge on the outer sphere representing the base of the lithosphere. Decompressional melting of this hot mantle source can generate huge volumes of basalt magma. It is thought that the massive flood basalt provinces on earth are produced above mantle hotspots.

Although most geologists accept the hotspot concept, the number of hotspots worldwide is still a matter of controversy. ..." http://www.geology.sdsu.edu/how_volcanoe...

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