Annually California takes part in the largest Earthquake Exercise in the world.
San Mateo County encourages you to take part in the preparedness exercise as well. at 10:20 on October 19th you should "DROP, COVER, AND HOLD ON" as you woul;d in an earthquake for 2 minutes. You are also encouraged to check all od your preparedness supplies to be ready.
More information is available at: https://www.shakeout.org/