 Complete the following phrase:  While most earthquakes are caused by movement of the Earths tectonic plates, human activity can also produce earthquakes. Activities both above ground and below may change the stresses and strains on the crust, including building reservoirs, extracting resources such as coal or oil, and injecting fluids underground for waste disposal or fracking. Most of these earthquakes have small magnitudes. The 5.7 magnitude 2011 Oklahoma earthquake is thought to have been caused by disposing wastewater from oil production into injection wells, and studies point to the states oil industry as the cause of other earthquakes in the past century. A Columbia University paper suggested that the 8.0 magnitude 