If I recall correctly, the upper stands moving was first noticed in 1982. Crowds had become large and raucous by that time.I graduated the year prior, so my Block I days were behind me. I was in the West Balcony with friends. When Brooks scored it was total pandemonium. High fives and hugs among strangers. Grown men in tears. Twenty years of football frustration relieved in that moment. I personally did not feel the balcony move, but I recall there were follow up inspections because some claimed the balconies moved.