Ancient aftershocks

New seismological research indicates that modern earthquakes in the Midwest are aftershocks of big earthquakes from over two centuries ago.  The Midwest isn’t the only victim to such seismic activity as the Sichuan earthquake came out of the blue as the earthquakes which occurred in the Midwest did as well. To find out more about this mouthful of a theory, visit these informative websites.

http://www.newscientist.com/article/mg20427334.600-quakes-from-the-1800s-still-shaking-planet.html

http://news.yahoo.com/s/livescience/20091104/sc_livescience/recentmidwestquakescalledaftershocksfrom1800s