1、 Earthquake is the most obvious precursor of tsunami. If you feel a strong vibration, don't get close to the seashore or the mouth of a river. If you hear reports of earthquakes nearby, be prepared for tsunami prevention and pay attention to TV and radio news. Remember that tsunamis sometimes reach thousands of kilometers away from the source a few hours after an earthquake.2、 Ships on the sea should avoid returning to the harbor after hearing the tsunami warning. The drop and turbulence caused by the tsunami in the harbor are very dangerous. If there is enough time, the owner should drive the ship to the open sea before the tsunami comes. If there is no time to leave the harbour, everyone will have to evacuate the ships in the harbor.3、 When a tsunami makes landfall, the sea water tends to rise or fall significantly. If you see that the sea surface retreats very fast, immediately evacuate to a higher inland area.4、 Everyone should have a first aid kit with enough medicine, drinking water and other necessities for 72 hours. This applies to tsunamis, earthquakes and all sudden disasters.