Earthquake rattles Utahns, nerves as aftershocks keep coming

A sizable aftershock jolted the Salt Lake Valley on Tuesday night, reigniting jitters for residents hit by a much stronger earthquake less than a month ago.The magnitude 4.2 quake, centered 2.5 miles northeast of Magna, struck at 8:56 p.m., according to the U.S. Geological Survey. It was later downgraded to magnitude 4.17.There were no immediate reports of damage.The latest temblor was among the most powerful aftershocks since March 18, the day a magnitude 5.7 earthquake rocked northern Utah, da