Much of the filming for " the Hemisphere " scenes , especially the CKS headquarters , took place over a two-day period , on the weekend of the 17 – 18 February 1990 . It took place at the Oakland City Hall which was closed at the time due to damage from the 1989 Loma Prieta earthquake
1989 Loma Prieta earthquake
1989 Loma Prieta earthquake
Megaville