The Old Faithful geyser in Yellowstone National Park attracts millions of visitors ( see https://phys.org/print426478631.html … but little is known about the geology of the Park – or the fluid pathway from below the surface. This has now been rectified to a certain degree as University of Utah earth scientists have mapped some of the geology following a seismic survey (and is published in Geophysical Research Letters, Oct 2017). The sensors picked up earth tremors and whenever this happened the ground water replenished the reservoir, heating it up and causing geysers to flow – and in more remote regions of the Park it caused springs and seeps to occur.
