RESTON, Va. (AP) _ A strong earthquake rattled the Aleutian Islands southwest of Alaska on Friday night, the U.S. Geological Survey said.
The quake, which struck at 8:59 p.m. EST, measured 6.0 on the open-ended Richter scale was centered 140 miles east of Adak, Alaska, in the Bering Sea, said Gail Wendt, public affairs specialist at the USGS offices here.
She said the quake registered on USGS instruments at the earthquake center in Golden, Colo., but there were no reports it was felt in the Alaska region.
The Richter scale is a measure of ground motion as recorded on seismographs. Each increase of 1.0 on the scale indicates a 10-fold increase in magnitude. For example, a quake measuring 3.5 would have 10 times the power of one that measured 2.5.
A quake measuring 6.0 is capable of severe damage in a populous area.