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These techniques were used to observe uplift near Norris Geyser Basin, an area where such movement had not previously been recorded. It was revealed that Norris rose approximately five inches (13 cm) between 1997 and 2003. This uplift, the greatest in the park, was most likely due to the movement of hydrothermal fluids (magma, hot water, gases) below the surface of the ground. In 2004, the localized uplift centered over Norris began to subside, though uplift occurring over the whole Yellowstone caldera is still apparent.

Photo credit: Christine Puskas, University of Utah.

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