Nearly twenty percent of the area under the land surrounding Yellowstone National Park, about 700,000 square miles, rests on top of a lake of liquid carbon. This discovery was published in the most recent volume of Earth and Planetary Science Letters.
The geologists behind the research are Saswata Hier-Majumder of the University of London and Benoit Tauzin of Ecole Normale Supérieure de Lyon. They used a global network of 583 seismic sensors to create a rendering of the upper mantle of Earth. The lake they detected is 217 miles below the surface of Earth, a distance far too deep to reach with current technology.