Tsunamis are among the most violent and fast moving natural disasters on Earth. Triggered by underwater earthquakes, volcanic eruptions, or landslides, these towering waves can move as fast as a jet and reach heights of over 30 meters. They can flatten cities, rip trees from the ground, and send vehicles tumbling like toys. In the chaos and panic of an oncoming wave, split second decisions can mean the difference between life and death.Unfortunately, many people make critical mistakes that cost them their lives. Here are six of the worst things you can do during a tsunami, and how to avoid them.1. Do Not Be Too CuriousWhen the ocean suddenly pulls back from the shore, it might seem like an interesting phenomenon. But do not treat it as a photo opportunity. When the sea recedes dramatically, it is a warning sign that a tsunami is about to strike.Some people walk out farther onto the exposed seabed to explore, not realizing they are stepping into the danger zone. By the time they see the wave, it is often too late to escape. Always move away from the water immediately and head to high ground if you notice this unusual event.2. Do Not Ignore the SignsTsunamis often come with subtle and not so subtle warnings. If you feel a strong or long earthquake near the coast, a tsunami could follow. Listen for loud roaring noises, similar to a plane or whistle. These can signal fast approaching waves. Emergency warning systems, sirens, or alerts on your phone or radio may also sound. Take all warnings seriously.Do not assume it will miss your area. Prepare to move inland right away and help others evacuate if you can.3. Do Not Waste TimeOnce a tsunami warning is issued, you may have less than thirty minutes to act, but do not assume you have that long. In some cases, waves can arrive in just a few minutes. Do not try to pack or gather belongings. If you are stuck in traffic, abandon your car and run to the nearest high ground. Vehicles can be swept away or crushed by the wave. Your best chance of survival is getting to a tall building or natural high point as fast as possible.4. Do Not Return Too EarlyAfter the first wave passes, it might seem like the danger is over, but that is not always the case. Tsunamis often come in multiple waves over several hours. The second or third wave may be larger than the first.Returning too early can put you in even more danger. In 2011, a man in California was swept away and killed by a second wave while taking photos after the initial impact. Stay in your shelter or at high ground until authorities declare it safe.5. Do Not Go Home Right AwayEven once the waves have stopped, the dangers are not gone. Flooded areas may hide damaged roads, unstable buildings, or contaminated water. Bridges may be at risk of collapse. Electrical systems and gas lines could be compromised. If your home was in the path of the water, wait for emergency crews to inspect it before going back inside.Never drink tap water until it has been confirmed safe. The damage caused by a tsunami can linger long after the waves are gone.6. Do Not Lower Your Guard Too SoonSurviving the initial wave is only part of the challenge. Aftershocks, fires, landslides, or dam failures may follow a major tsunami. Always stay alert and be prepared for more emergencies. Keep a disaster kit on hand with first aid supplies, food, water, and other essentials that can last for at least three days. Even if the worst seems over, it is critical to remain cautious until you know the situation is stable.