Chile reels in aftermath of quake, emergency workers provide aid
03/01/10 The Washington Post — The earthquake, centered 200 miles southwest of the capital, was one of at least a dozen in Chile since 1973 that were larger than magnitude 7. The quakes release stresses between two tectonic plates that are moving past each other at a rate roughly one-third faster than the plates that define the San Andreas fault in California, according to Jonathan Bray, a professor of geotechnical engineering at the University of California at Berkeley.