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This U.S. Geological Survey report summarizes research on a widespread hydrothermal disturbance that occurs annually in the Norris Geyser Basin of Yellowstone National Park. The disturbance is characterized by simultaneous changes in the discharge characteristics of many springs. To characterize the disturbance, water samples from hot springs and geysers were collected each week and analyzed to determine whether chemical and isotopic changes also occurred in the thermal waters at the time of the disturbance.
