Though a Texas official says he sees no link between fracking and the recent earthquakes in North Texas, others say nothing is off the table.
The U.S. Geological Survey reports a magnitude-2.3 earthquake Wednesday afternoon in Irving.
The chance of a major earthquake in North Texas is "very remote", according to the Dallas Office of Emergency Management.
The ground shook near Irving for the 16th time this week after a 2.6-magnitude earthquake was recorded shortly before noon Friday near Bachman Lake.
Members of Dallas' Southern Methodist University seismology team will install nearly two dozen more seismographs in the Irving area to try to learn more about a cluster of recent earthquakes.
An earthquake swarm continues to rattle Irving Wednesday as a fourth tremor has been confirmed by the United States Geological Survey, increasing the two-day total to 12 temblors.