Map of earthquake occurrence in Oklahoma (with zoomed in areas) with different colors representing the time period of occurrence and the size of circles representing the magnitude of earthquake. Credit: Author of Time via Wikipedia, CC BY-SA 3.0

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Map of earthquake occurrence in Oklahoma (with zoomed in areas) with different colors representing the time period of occurrence and the size of circles representing the magnitude of earthquake. Credit: Author of Time via Wikipedia, CC BY-SA 3.0

Map of earthquake occurrence in Oklahoma (with zoomed in areas) with different colors representing the time period of occurrence and the size of circles representing the magnitude of earthquake. Credit: Author of Time via Wikipedia, CC BY-SA 3.0

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