How big was the earthquake by Malibu beach Los Angeles? Which app notifies you if you are in California?

How big was the earthquake by Malibu beach Los Angeles? Which app notifies you if you are in California?

January 25, 2023, 2:55 am
After a 4.2 magnitude earthquake was felt in LA, many residents are wondering what apps will notify them in cases another major quake strikes.
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Los Angeles ~ Malibu ~ California