Estimated annual number of significant earthquakes. A significant earthquake is classified as one that meets at least one of the following: caused deaths, moderate damage ($1 million or more), magnitude 7.5 or greater, Modified Mercalli Intensity (MMI) X or greater, or generated a tsunami. Due to reporting and evidence, recent data will be more complete than the long historical record; an increase in reported earthquakes over this period therefore doesn't indicate a true increase.
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