Tsunami warning signs on the beach
If shaking from an earthquake lasts longer than 20 seconds, or the sea suddenly recedes or roars — do not wait for sirens. Move to the nearest evacuation route sign and to ground at least 30 m above sea level. Patong, Kamala, Karon and Kata are all dangerously low-lying. Tsunami evacuation signs are posted across western Phuket; learn the closest route the day you arrive.