the trembler struck at 5:13 am on April 18, 1906, and all hell broke loose from there.
check out the SF Chronicle site for some pretty niffty coverage of the '06 quake.
and here are are bunch of old time shots of the damage:
SF pretty much flattened...
check out city hall off to the right...
fire takes on the call building...
view of russian hill...
downtown goes up in flames...
the ruins of city hall...
south van ness getting its tilt on...
cobblestones split, rails twisted...
view from above in hot air balloon...