A recent “swarm” of small quakes in Irving has caused a stir and ignited a series of articles about the relation between oil and gas activity and seismic events. The quakes in Irving were strong enough to knock some books off of shelves.
After residents of the town of Azle experienced a series of quakes in 2013, residents protested in Austin before the Texas Railroad Commission, and as a result the RRC hired its own seismologist to study the problem. Most scientists have linked quakes in Texas and Oklahoma to injection of large volumes of produced water. Recently one study in Ohio linked quakes there to recent fracking of wells in the area.
Most if not all of the actual studies of recent quake activity are being done by Southern Methodist University. It has studied the quakes around Azle, and a report of its study is expected soon. After the quakes in Irving, SMU is installing seismic monitors in that area.
Stories about the quakes: