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.
Mo. schools and residents to prepare for next big earthquake
It was nearly 200 years ago that the first in a series of massive earthquakes shook Missouri and much of the nation. Now, several Missouri school districts will take part in a drill to prepare for the next big one.
State officials say that nearly 100 districts and individual schools have registered for Missouri's second statewide earthquake drill at 10:15 a.m. on Feb. 7. Meanwhile, more than 146,000 residents are also registered for the drill, called the "Great Central U.S. ShakeOut."
The magnitude-5.8 earthquake that rattled the eastern U.S. on Tuesday took everyone — even geologists — by surprise. But even when there are reasons to think an earthquake could be around the corner, scientists still can't make good predictions.
A light earthquake shook parts of Missouri and souther Illinois early this morning. The United States Geological Service says the 4.2 magnitude earthquake was centered about 14 miles east of Sullivan in Franklin County. Sullivan is about 50 miles southwest of St. Louis.
The earthquake, which was 3.2 miles deep hit about 3:10 a.m. The USGS says the temblor was felt as far west as Columbia, Mo., and as far east as Carbondale, Ill.