February 21, 2013 – San Francisco Bay Area Earthquake Probability Map: The California earthquake of April 18, 1906 (marked by the Green Line) struck at 5:12AM. It ruptured the northern most 296 miles (477 kilometers) of the San Andreas fault from northwest of San Juan Bautista, exactly through San Francisco and continuing up to the north-west along the Pacific Ocean coast. Areas situated in sediment-filled valleys sustained stronger shaking, and damage, than nearby bedrock sites. This earthquake is perhaps remembered most for the fire that it spawned. Shaking damage, however, was equally severe in many places along the fault rupture. The frequently quoted value of 700 deaths, caused by the earthquake and fire, is now believed to underestimate the total loss of life by a factor of 3 or 4; putting total deaths at between 2,100 to 2,800.
Today, however, the SF Bay Area is home to 7.5 million people. The area includes the world-renowned technology hub, known as “The Silicon Valley,” centered at San Jose. Additionally, Oakland is a major industrial center and home to the Port of Oakland; which is the 5th busiest intermodal container port in the United States. The distance scale shows 50 kilometers or 31 miles. Oakland is located about 70 miles east of the 1906 quake.
The SF Bay Area Earthquake Probability Map, reflects the areas most subject to a major earthquake; with the darker the color, the higher the risk. Earthquake potential, generally follows the San Andres Fault; with the risk being greater to the east than the west. Oakland and Fremont are at “The Heart” of the earthquake risk zone. A major earthquake today, such as the one that struck 107 years ago, would be catastrophic to California and the Nation!
The Master of Disaster