Originally published on Sat January 5, 2013 12:12 pm
An earthquake with a magnitude of 7.5 hit off the coast of southeastern Alaska just before midnight local time Friday, according to the U.S. Geological Survey. The USGS initially reported the event as a magnitude 7.7 quake.
The National Oceanic and Atmospheric Administration says sea level readings indicate the quake caused a tsunami. "It may have been destructive along coasts near the earthquake epicenter," a NOAA report said.
About noon today, people in eastern Kentucky were startled by a novel event - an earthquake. The U.S. Geological Survey says a tremor shook the region near Whitesburg. It's a rural area about 150 miles southeast of Lexington, Ky., and about 140 miles northeast of Knoxville, Tenn. No one was hurt.
The magnitude was 4.3, which the USGS site says triggers a "sensation like a heavy truck striking the building" and is "felt by nearly everyone".
On April 11 of this year, an extraordinary cluster of earthquakes struck off Sumatra. The largest shock, magnitude 8.7, produced stronger ground-shaking than any earthquake ever recorded. And it surprised seismologists by triggering more than a dozen moderate earthquakes around the world.
The quakes are also a sign of big changes to come in the Earth's crust.