There are only three known survivors left of the massive earthquake and ensuing fire that killed thousands. Of the three, only one, Bill DelMonte, who was only a few months old at the time, was able to make it to this year's ceremony.
The event took place at about 5 a.m. at Lotta's Fountain, which was a gathering place for survivors in 1906. The ceremony included a moment of silence for the victims of Japan's earthquake and tsunami. Organizers also took American Red Cross donations for the relief effort.
Historians say Japan stepped forward in 1906 to help San Francisco's victims and gave $250,000 - the most of any other country - toward the city's recovery.
The Associated Press contributed to this report.