On April 14 , 2005 , the United States Geological Survey released a map detailing the results of a new tool that measures ground shaking during an earthquake . The map determined that the 1906 San Francisco earthquake was most powerful in an area between Santa Rosa and what is now Sebastopol , causing more damage in Santa Rosa ( for its size ) than any other city affected
1906 San Francisco earthquake
1906 San Francisco earthquake
Santa Rosa, California