According to the Army Museum at the Presidio , San Francisco , Petaluma was relatively unharmed during the San Francisco earthquake of April 18 , 1906 , due to significant stable bedrock underlying the region . As one of the few communities in the region left standing after the earthquake , Petaluma was the staging point for most Sonoma County rescue and relief efforts
San Francisco earthquake
1906 San Francisco earthquake
Petaluma, California