In this figure, the dots mark the epicenters of earthquakes of magnitude 2.0 or greater between January 1974 and December 2013. The stars mark the epicenters of earthquakes of magnitude 5.0 or greater since 1800. Geological structures identified in the figure include the Ste. Genevieve, New Madrid and Wabash Valley seismic areas, Illinois Basin, Ozark Dome (OD) and Reelfoot Rift (RR).
With the New Madrid fault just a hundred miles south of St. Louis, it’s long been known that the region is at a greater risk for an earthquake than other parts of the Midwest. But new research indicates that St. Louis is part of an area that has seismic activity of its own.
Originally published on Thu September 27, 2012 8:31 am
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."
Originally published on Sat August 27, 2011 9:53 am
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.