Man-made quakes have hit once stable regions in central and eastern US . These include Arkansas , Colorado , Kansas , Ohio , Oklahoma and Texas . Some were caused by injection of wastewater which can activate faults . Many of faults awakened by drilling have not moved in 1973-2014 .
Man-made quakes have hit once stable regions in central and eastern US . These include Arkansas , Colorado , Kansas , Ohio , Oklahoma and Texas . Some were caused by injection of wastewater which can activate faults . Many of faults awakened by drilling have not moved in millions of years .