Northern Carizzo Plain (e.g the very famous location where many of the aerial photos of the obvious strike slip right lateral offsets are seen - e.g offset streams which take a jog at the fault line). The San Andreas has not moved there in any major way since, what, about 1966? No wonder it was a 6.0.
Parkfield averaged a mag 6.0 quake every 22 years on a very regular schedule for a VERY long period of time.
So the area was wired up with more seismic monitoring equipment than any other place on earth....and then they didn't get the 22 year quake :-)
Actually pretty cool (presuming this did very limited damage, which it likely did) that it finally happened, as with more monitoring there than anywhere else on the planet, we'll learn an awful lot scientifically from this quake.
Very interesting and insightful "about" page. A good sensible position.