An aftershock to a massive earthquake in 1983 has rattled across central Idaho and western Montana. No injuries or property damage were reported.

The National Earthquake Information Center in Golden, Colo., said the Thursday morning quake registered 4.7 on the Richter scale and was centered about 10 miles south of Challis. Residents said the quake lasted 15 to 30 seconds. It occurred at 11:32 a.m., MDT."All I could think is that everything was going to crash down on me," said Donna Butts of Challis.

The epicenter of Thursday's quake was northwest of the fatal October 1983 earthquake that registered 7.3 on the Richter scale. Two Challis children were killed when the rock front of a store toppled on them as they walked to school. Although the area is sparsely populated, millions of dollars in damage occurred.