Lots of quake activity there this week, including a 7.2 and a 6.1. And it looks like they turn out to be foreshocks.
http://www.google.com/hostednews/canadianpress/article/ALeqM5iOJwLEwcIwB93yjCubUJpuu4UZKA?docId=6212195
Edit to update CNN reporting that USGS has upgraded quake from a 7.9 to an 8.8 and now an 8.9

http://www.google.com/hostednews/canadianpress/article/ALeqM5iOJwLEwcIwB93yjCubUJpuu4UZKA?docId=6212195
Edit to update CNN reporting that USGS has upgraded quake from a 7.9 to an 8.8 and now an 8.9