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Climate & Environment

Today is the Great California Shake Out for earthquake readiness. What to know

A man stands to the left of ruptured ground after an earthquake in Ridgecrest, California, in 2019.
A 2019 earthquake led to some damage in Ridgecrest.
(
Mario Tama
/
Getty Images
)

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Topline:

Around 10:15 a.m. today (10:15 on 10/15, get it?), smartphones across California will buzz and howl with a test earthquake warning. Don't be alarmed — but do take it as a cue to check your readiness level.

Why it matters: California is earthquake country. It's not a matter of if the Big One will strike. It's a matter of when. So it's always good to get a reminder to stay on top of your readiness by having an emergency plan, keeping your supplies fresh and getting to know your neighbors.

Why now: Today is the Great California Shake Out — an annual test of the earthquake early warning system that reminds people what to do if they get a real warning or feel the ground shaking: Drop, cover and hold on.

What to do: When the alert happens, be cool; you totally knew it was coming. Then check out the Great California Shake Out website for more details and resources; download the MyShake app (or tell a friend to download it) to ensure that you get an early warning about a big earthquake; check out the U.S. Geological Survey site for information on recent quakes and much more; and listen to LAist's The Big One podcast, which is all about how an earthquake could play out in Southern California and what you can do about it.

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