DALLAS (AP)  Northern Texas has been getting more rare earth tremors, one day after several minor earthquakes made Halloween 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 911 systems lit up with calls from people near the quakes' epicenters but no damage was reported. Copyright 2008 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed. Guidelines: You share in the USA TODAY community, so please keep your comments smart and civil. Don't attack other readers personally, and keep your language decent. Use the "Report Abuse" button to make a difference. You share in the USA TODAY community, so please keep your comments smart and civil. Don't attack other readers personally, and keep your language decent. Use the "Report Abuse" button to make a difference. Read more