In the 89 earthquake, ABC was well prepared since they had their crew in SF for the game, and that Ted Koppel was already in place for Nightline. They had more of a advantage than the other 2 networks. Didn't they also pick up parts of KGO's coverage with Cheryl Jennings? i saw her at one point on ABC, but i can't rememebr when.
Yes KGO-TV feed was used nationally on ABC News too with Cheryl Jennings and the 1989 ABC7 Crew. I know KOVR 13 the then ABC Affiliate for Sacramento went local in some segments of the KGO Simulcast to look for members of Cal OES to respond to the quake and probably went local initially with the initial reports of feeling a quake in the Sacramento Valley but not yet pinpointing the epicenter until they got the KGO Simulcast from ABC News.