Tornadoes aren't the only hazard in Oklahoma. Earthquakes have been on the rise in recent years and a growing body of research indicates the phenomena is linked to oil and gas wastewater disposal. This map mainly serves as a locator for story names of a National Geographic Daily News article, but also shows the dense clustering of (>3.0) earthquakes around Oklahoma City, where a fair amount of injection wells exist.

Credit NG staff, Jamie Hawk. Sources: USGS; Oklahoma Geological Survey