Nature World News: Human activities that inject fluids into the ground, such as natural gas extractions and geothermal energy production, are the cause of many earthquakes in the United States, including a destructive 5.6-magnitude tremor in Oklahoma in 2011, according to new research published in the journal Science.
While the continental United States experiences small earthquakes each day, a recent study by the U.S. Geological Survey found that the annual number of earthquakes recorded at magnitude 3.0 or greater...