The heads up is enough to read the message but not enough to decide if you need to act on it or not. Before you can process it the shaking starts.

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loloquwowndueo an hour ago | parent [-]

You always need to act on it. Get an earthquake alert? Run outside. You can go back if it was a false alert.

In Mexico City the seismic alert gives like a minute (sensors are on the coast off Guerrero 350km away). Communities closer to the usual epicenter get almost no warning.

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obmelvin 25 minutes ago | parent [-]

Before one can action one needs time to read and process whether the alert is for earthquake, tsunami, child abduction, etc

	▲	lukan 4 minutes ago \| parent [-]
		Those things could be solved with better UI (pictures, colors, ..) to see on one glance what is going on.