A 2.4 magnitude quake woke up some residents at 8:04 a.m. A second quake of 2.6 magnitude happened at 1:37 p.m.
A third happened at 2:25 pm and was 3.0 magnitude.
A fourth quake occurred at 2:43 p.m. and was the smallest of the day, a 2.2 magnitude.
All of the quakes were centered by the site of Texas Stadium.
The four quakes on Tuesday makes for 43 total quakes since April 2014 in the Irving-area.
The quakes drew an overflow crowd to Irving Town Hall Tuesday night, just hours after the ground stopped shaking.
There, people expressed concerns, from potentially decreasing property values to possible injury, should a big quake hit.
They heard a taped presentation from an SMU seismologist who briefed council last week.
He said that more research needs to be done before any determinations into the cause of the quakes are made.
The mayor told residents that there hasn't been any fracking or any injection wells in Irving for 2.5 years.
Still, several people told council members they want them to push for a statewide ban on fracking in case it's nearby activity that's causing the quakes.
The mayor did point out that seismologists have added instruments to record activity and they are working with other cities and state officials to study the problem and take action whatever that might be.
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