updated 11/1/2008 7:39:21 PM ET 2008-11-01T23:39:21

Northern Texas has been getting more rare earth tremors, one day after several minor earthquakes made the Halloween holiday memorable for some people in the area.

Two almost simultaneous aftershocks were centered beneath Grand Prairie and Irving just before 7 a.m. Saturday. The U.S. Geological Survey says the Grand Prairie quake measured 2.5 magnitude and the Irving quake came in at 2.7.

Saturday's tremors between Dallas and Fort Worth were in the same general areas as on Friday, when tremors of magnitude 2.5 set off car alarms. Switchboards for emergency systems lit up with calls from people near the quakes' epicenters but no damage was reported.

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