The city of Los Angeles has released what's called the "Shake Alert LA" app.
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It's based on the US Geological Survey's warning system.
The app uses a network of in-ground sensors that detect seismic activity.
Users will be alerted if an earthquake with a magnitude of at least 5.0 is detected.
How much warning they will have will depend on the user's location.
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Experts say even just a few extra seconds can help people find a safe place in an earthquake.
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