At 10:15 a.m. today, all 93 emergency sirens in San Francisco will go off. It's all part of the Great Shakeout. Millions of Californians will take part in in "the largest earthquake drill ever." Will you? Here's what you're supposed to do:

1. Drop, Cover, and Hold On: Drop to the ground, take Cover under a table or desk, and Hold On to it as if a major earthquake were happening (stay down for at least 60 seconds). [Neeeerrrrrd -- SFist] Practice now so you will immediately protect yourself during earthquakes! (See this page for what to do if you are in bed, outside, driving, in a tall building, or other situations.) See this page for what to do if you have a disability or an activity limitation.)

2. While still under the table, or wherever you are, look around and imagine what would happen in a major earthquake. What would fall on you or others? What would be damaged? What would life be like after? What will you do before the actual earthquake happens to reduce losses and quickly recover?

3. Finally, you can practice what you will do after the shaking stops.

If you and your office mates take part in the drill, be sure to send us lots of amusing and hilarious pics. Just like you should do in any big quake.

LAist Editor Zach Behrens was neither injured nor trapped under a pile of rubble during today's 7.8 earthquake simulation that hit Los Angeles, one of the largest earthquake drills to take place.

"This is like the 1906 earthquake in San Francisco, but our equivalent of that event," said Lucy Jones, the chief scientist for this demonstration project, officially known as The Great Southern California Shakeout. (We hope to see the Bay Area has an even bigger one soon.)

In a strange twist, however, a minor earthquake struck Central California just 24 minutes after the largest earthquake drill in US history hit the Los Angeles region was only a small one. At 10:24 a.m., a 3.2 quake struck near San Juan Bautista, a city northwest of Monterey and Salinas. It was followed by a 1.7 aftershock six minutes later. So, you know, stay prepared, folk.

Update: Doh! It happened a few weeks ago.