The U.S. Geological Survey presents more interesting information on the Chile magnitude 8.8 quake here. The aftershock report notes
In the time period since the earthquake's origin at 2010-02-27 06:34 to 2010-03-15 15:00 UTC, the USGS NEIC has located 229 aftershocks of magnitude 5.0 or greater. Eighteen of these aftershocks have magnitudes of 6.0 or greater.
You've been hearing about many of these not insignificant aftershocks in the news.
Below is a current aftershock map, which can be found with updates here. Note the scale - these have been occurring along the plate boundary over a distance of about 1000 km, and over an area of about 50,000 square kilometers!