Within the central and eastern United States, the number of earthquakes has increased dramatically over the past few years. Are they natural, or man-made?
And what should be done in the future?
Between the years 1973–2008, there was an average of 25 earthquakes
of magnitude three and larger in the central and eastern United
States. This rate ballooned to over 600 M3+ earthquakes in 2014 and
over 1000 in 2015. Since 2015 the earthquake rate has declined
significantly (364 M3+ earthquakes in 2017), but this is still much
higher than the natural earthquake rate.
The USGS is currently studying seismicity that may be induced at 6 locations across the United States. These studies involve earthquake monitoring, examining industrial data, and evaluating any relationships between seismicity and industrial actions.