I happen to live directly over a magma plume that is currently erupting to the surface for the past 20 years. The lava flows, when hardened, look exactly like the Crater of the Moons (which I last visited in 1982) lava flows, and it's hard to tell which place you're at just by looking at the hardened lava. The volcano cap over our magma plume is now about 30,000 feet thick, half of which is submerged under the Pacific Ocean, and the other half jutting upwards to circa 15,000 feet elevation. Of course, the entire island chain was formed by drifting of the continental plate over our plume, carrying away one island after another in a northwesterly direction as they were formed, and the only active volcanoes are those on the Island of Hawaii (Mauna Loa, which erupts every 10 years or so, Kilauea, which has been in continuus eruption for the last 20 years, and which is known to have experienced 100-year eruptive events, and Hualalai, which erupts every century or so), which is directly over the plume. Of course, we have another active volcano currently erupting just to the south of us, about 10,000 feet from the surface (Loihi), which will reach the surface and make the Big Island even bigger in roughly another million years. Technically, Haleakala on Maui is still 'active', because it had a minor side-flank cinder cone eruption circa 1805 that lasted a day or two. We've placed our best telescopes on the 'extinct' volcano Mauna Kea, since it last erupted circa 20,000 years ago, during the ice ages, leaving surface basalt that hardened under glaciers, making for excellent stone material prized by the original inhabitants as the best in the islands for adzes, etc. The last phases of this type of volcanic activity results in 'cinder cones' which dot the volcanoes by the hundreds. Flank eruptions produce copious amounts of cinder (rock with lots of gas-pockets) that is spit out in the form of a cone, with the much lighter 'ash' being wind-driven onto the slopes of the volcano proper, forming a thick layer (20 to 50 feet in some areas) that makes excellent farmland, formerly used for sugarcane and now used for a wide variety of other crops. About 20% of the island's electricity comes from two geo-thermal wells drilled by Puna Geothermal Ventures (PGV). The PGV wells sometimes have had sulfur dioxide releases which have caused them problems, otherwise all of the electricity would likely now be from geothermal. So, what is the prospect for geothermal drilling in the Yellowstone Caldera region?