Earthquakes attributable to human activities are called 'induced seismic events' or 'induced earthquakes.' In the past several years induced seismic events related to energy development projects have drawn heightened public attention.Although only a very small fraction of injection and extraction activities at hundreds of thousands of energy development sites in the United States have induced seismicity at levels that are noticeable to the public, seismic events caused by or likely related to energy development have been measured and felt in Alabama, Arkansas, California, Colorado, Illinois, Louisiana, Mississippi, Nebraska, Nevada, New Mexico, Ohio, Oklahoma, and Texas.