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There is a generally a strong correlation between earthquake activity and geyser behavior. This phenomena has been observed for centuries, but only recently have the changes in geyser behavior been documented. The 1959 Hegben Lake earthquake has had the most dramatic effect on Yellowstone geysers of any earthquake since the park's discovery (Rhinehart, 1980). Since the epicenter was so close to Yellowstone (only about 50 km away) the effects were significant. Immediately after the earthquake, all the geysers in the park erupted, and the average temperature in geysers and springs increased by an average of 2°C. Some geysers that were previously dormant became active, ostensibly by the opening of sealed channels along planes of weakness, and several active geysers changed their eruptive behavior.