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 The display is updated every 30 minutes using data from the National Earthquake Information Center. Earthquakes that have occurred within the last 24 hours are shown with red circles. The circles fade through orange to yellow within 15 days. After 15 days, the circles are replaced by light purple dots that remain on the map for five years. The distribution of seismicity over the past 5 years demonstrates how earthquakes define the boundaries of tectonic plates, and the relationship between topography and seismicity. |
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