Seismologists say a 4.2 magnitude earthquake aftershock hit the Salt Lake Valley last night. 

Joe Dougherty of the Utah Division of Emergency Management says the aftershock was felt over a wide area.

The aftershock began just before 9 p.m. and was centered about three miles southwest of Magna. 

Earthquake researchers at the University of Utah say more than 12-hundred aftershocks have happened since a 5.7 magnitude earthquake was felt near Magna on March 18th. 

Last night's aftershock was the strongest in the valley since the original quake.  Emergency management officials are still determining if there was any damage.

Doherty says even more aftershocks are likely to happen, though few of them will be as strong as last night's.

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