The three supereruptions occurred 2.1 million, 1.3 million, and approximately 640,000 years ago, forming the Island Park Caldera, the Henry's Fork Caldera, and Yellowstone calderas, respectively. 44 58 34.79 (Lat) -110 42 03.37 (Long) Note the columnar basalt columns in the foreground. And like the wax in a lava lamp, it can develop a mushroom shape. The eastern Snake River Plain is a topographic depression that cuts across Basin and Range Mountain structures, more or less parallel to North American plate motion. Lava from large fissures in northeastern Oregon and southeastern Washington was so fluid that it flowed considerable distances, forming the numerous layers of basalt familiar to visitors to the Columbia Gorge. Norris Geyser Basin - Yellowstone National Park (U.S. National Park Latitude: 44 25' 48.00" NLongitude: -110 40' 12.00" W, Satellite map of Yellowstone hotspot in Google Maps. Should the hotspot erupt again, scientists predict it will be another massive event. The basaltic melt from the hotspot stem may, in fact, form two levels of magma chambers within the overriding plate. Henry's Fork Caldera - Wikipedia Yellowstone hotspot - Wikipedia Latitude & Longitude N4410'00" - N4500'00", W11104'60" - W10949'60 . Detailed Description Shaded relief map showing the path of the Yellowstone hotspot. The resulting calderas include the Island Park Caldera, the Henry's Fork Caldera, and the Bruneau-Jarbidge caldera. In an attempt to map the Hawaiian mantle plume as far down as the lower mantle [92], scientists have used tomography, a type of three-dimensional seismic imaging. NASA proposed introducing water at high pressure 10 kilometers underground. The Yellowstone hotspot is well known for generating supereruptions in the geologic past that are far more explosive than historic examples. Much of the complex crater has become obliterated by later Cascadia and Sierra orogenies.