I've been following the eyewitness testimonies at BBC -- people have written from all over northern Pakistan to describe the quake. There are also folks there from Delhi and Chandigarh who say they felt severe shaking. (A guy in Gurgaon, near Delhi, says his 21-story office building developed large cracks after the quake. If that's happening in Delhi, it makes me shudder to think of what must have happened in Islamabad...)
This seems to be the worst earthquake in South Asia since quake in Gujurat in January 2001.