Check yourself, then the people immediately around you. Treat bleeding before you look for damage.
Expect aftershocks. They can be strong enough to bring down weakened structures. Leave damaged buildings and do not re-enter until they are inspected.
Check for hazards: gas leaks (smell, hiss), damaged wiring, and water leaks. If you smell gas, open windows, leave, and shut the supply off from outside if you can do so safely.
Use text messages instead of calls. Networks are congested and text gets through.
Listen to official channels. Rumours fill the gap when information is missing, and they travel faster than corrections.
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