Currently, there is a coordinated effort underway by a number of organizations to study and identify a possible connection between hydraulic fracturing (fracing) and a recent increase in seismic activity.
Some scientists have observed an increase in seismic activity in the central and eastern regions of the United States, as shown in the graphic below. Scientists with the U.S. Geological Survey have been documenting the number of earthquakes of Richter Scale 3.0 or larger and have noted an increase in the number of earthquakes. There have been more than 100 earthquakes a year on average in the last four years, up from 20 a year between 1970 to 2000. California in particular has experienced an increase in seismic activity. After a relatively quiet period of seismic activity in the Los Angeles area, the last five months have been marked by five earthquakes measured larger than 4.0. That hasn’t occurred since 1994, the year of the destructive Northridge earthquake that produced 53 such temblors. In the two decades subsequent to the Northridge earthquake, there were some years that passed without a single quake of 4.0 or greater.
One of these organizations exploring a potential link between fracing and seismic activity is the U.S. Energy Association. Their main focus is on determining the quality and availability of information. With so much misinformation in the media, it is easy for mistaken assumptions to be published just to score a political point.