http://quake.wr.usgs.gov/recenteqs/Maps/117-34.html
 
Short, but strong.  5.3.  Seems to be a separate quake, not an aftershock.  Although it seems to have tirggered a 2.4 aftershock at the site of last week's.  There was a 3.5 immediately after the big one (I think I felt it...either that or my legs were still shaking), and then a couple 2.2's