What to Do During a Tsunami Minute by Minute

Knowing what to do during a tsunami comes down to one skill: moving to high ground fast and staying there until officials say it is safe. We define a tsunami as a series of powerful ocean waves, usually set off by an undersea earthquake, that can flood a coastline for hours. A good plan gets you and your family onto high ground, together, with time to spare.

You may live on the coast, rent a beach house once a year, or pass through a seaside town on a road trip. The timeline is the same for all of you. It runs from the first tremor or strange pull of the sea, through the first urgent minutes, into hours of waiting, and ends with the official all-clear.

Start by learning the warning signs below. The next time you reach the coast, find the nearest high ground before you unpack the cooler. That one habit buys you minutes when minutes matter most.

The First Seconds: What to Do During a Tsunami Starts With Recognition

You are spreading a towel on the sand when the ground starts to roll beneath you. The shaking goes on and on. A minute later, the water slides away from the beach and leaves fish flopping on bare sand. Knowing what to do during a tsunami turns that strange moment into a clear signal to move.

Fast recognition gives you the head start that makes every later step possible. Once you know the signs, the next step is the evacuation itself, which comes right after.

Long or Strong, Get Gone

Emergency managers on the West Coast teach a simple rule: 'long or strong, get gone.' If the shaking is strong enough to make standing hard, or it lasts longer than about 20 seconds, treat it as a tsunami warning.

If the shaking is severe, drop, cover, and hold on until it stops. This protects you from falling objects in the first seconds. Then get up and evacuate immediately. Leave without waiting for an official warning, because the earthquake itself is your warning.

Natural Warning Signs

• A strong or long earthquake. Shaking that knocks you off balance or rolls on for a long time can push the seafloor enough to start a tsunami.
• A sudden drop in sea level. The ocean pulls back fast and exposes sand, rocks, and reef that are normally underwater.
• A sudden rise in sea level. The water can also surge up the beach like a fast tide that keeps coming.
• A loud roar from the ocean. Survivors often describe a sound like a freight train or a jet engine coming from the water.

The Receding Sea

A bare seafloor is fascinating, and the urge to walk out and look is natural. Treat it as a signal to run. The water that pulled back is gathering into the incoming wave. Leave the shells and skip the photos, and head for high ground at once. In 2004, a young British girl on a beach in Thailand recognized the receding sea from a school geography lesson and warned her family. The beach was cleared before the wave hit.

Official Alerts

NOAA runs tsunami warning centers that send alerts through the National Weather Service. You may hear outdoor sirens, get a Wireless Emergency Alert on your phone, or catch a warning on NOAA Weather Radio or local broadcasts. National emergency management agencies in other countries use similar systems. When a magnitude 7.3 earthquake struck off Chiapas, Mexico in July 2026, Pacific tsunami alerts went out to Mexico and Guatemala within minutes. Act on any official tsunami warning right away.

Local Tsunamis: Minutes to Arrival

A local tsunami starts close to shore, and the first wave can arrive within minutes. Official alerts may not reach you in time. In a local tsunami, nature may give the only warning, so the shaking or the strange sea is your cue to move.

Distant Tsunamis: Hours to Arrival

A distant tsunami starts far across the ocean and can take hours to arrive. These usually come with official warnings and time to evacuate in an orderly way. Use that time to gather your family and walk out calmly.

The First 15 Minutes: Move Inland and Uphill on Foot

Quick, smart evacuation puts distance and height between you and the water. Once you suspect a tsunami, every minute counts. Knowing what to do during a tsunami means moving before you see the wave. Here is the sequence that gets you to safety, followed by what to do once you are there.

The Evacuation Sequence

1. Go on foot. Walk fast or run toward high ground the moment you recognize a warning sign.
2. Follow tsunami evacuation route signs. Many coastal towns post blue and white signs with a wave and an arrow that point you to safe ground.
3. Head up and in. Aim for ground about 100 feet (30 meters) above sea level, or move up to 2 miles (3 kilometers) inland. If your town has a local evacuation map, follow its routes and safe zones instead.
4. Take only your grab-and-go bag if it is at hand. Leave everything else behind. Your belongings can be replaced, and seconds spent packing cannot be recovered.
5. Move away from rivers and streams. Tsunami waves travel up channels that lead to the sea, so pick routes on higher ground away from them.
6. Keep going until you reach safe ground. Stop only when you are high enough and far enough inland.

Why Your Feet Beat Your Car

Driving feels faster, and on an empty road it would be. After an earthquake, roads may be cracked, blocked by debris, or jammed with traffic within minutes. A car stuck in a line of cars is a trap if the water arrives. On foot, you can cut across parking lots, climb stairs, and squeeze past stalled vehicles. Your legs keep working when the road stops.

Helping Others on the Way

Children, older adults, and people with disabilities may need help. Grab a hand, carry a toddler, or steady a neighbor as you move. Keep moving while you help. If you are evacuating with a large family, you have more people to protect and also more hands to share the work. Assign one adult to each child before you ever need to, and everyone knows their job when the shaking starts.

Vertical Evacuation When High Ground Is Too Far

If you are on a flat coastline and high ground is out of reach, go up instead of out. Climb to the third floor or higher, or onto the roof, of a sturdy reinforced concrete building. Some flat coastal towns build or mark official vertical evacuation structures for exactly this reason. Learn where yours are, and a low, flat location gets its own built-in high ground.

Treat trees as an absolute last resort. A tall, strong tree is better than open ground, but debris-filled water can strip or topple it. Once you are up, stay up, because the next waves are on their way.

The Hours After: Why the First Wave Is Rarely the Last

Patience on high ground keeps you alive through the most dangerous stretch of the event. Staying put can feel like the hardest part, especially when you want to check on your home. Understanding how tsunami waves arrive makes waiting easier, and the steps below make the time useful.

How a Wave Train Works

A tsunami is a series of waves called a wave train. The waves can keep coming for hours. The gap between them can run from several minutes to an hour. The first wave is often smaller than the ones that follow. A calm stretch between waves is part of the event, so treat it as a pause.

The Danger of Going Back Early

Many tsunami deaths happen when people return too early to check property or look for loved ones. In 1964, a tsunami from the Great Alaska Earthquake reached Crescent City, California. The first waves were modest. Some people went back down to the waterfront, and a later, larger wave flooded the downtown and took lives. Knowing what to do during a tsunami includes knowing when to stay right where you are.

What to Do While You Wait

• Stay put on high ground. Remain at your safe spot until officials give the all-clear, even if the sea looks calm.
• Monitor official alerts. Keep a battery-powered or hand-crank radio tuned to NOAA Weather Radio or local news, and watch your phone for emergency alerts.
• Text instead of calling. Text messages use less network capacity and leave phone lines open for emergency calls.
• Prepare for aftershocks. Move away from walls, windows, and anything that could fall, and drop, cover, and hold on if shaking returns.

Use the waiting time well. Count heads in your group, share water and food from your grab-and-go bag, and treat minor cuts. A little preparedness turns a long wait into a manageable one.

Waiting for the All-Clear

Tsunami danger can last eight hours or longer. Only emergency officials should declare it safe to return. They track the waves with tide gauges and ocean sensors, so their call is based on data you cannot see from a hilltop. When they give the all-clear, return carefully and follow their directions about which areas are open.

Tsunami Timeline at a Glance

• First seconds: Recognize the shaking, the receding sea, the roar, or an official alert. Drop, cover, and hold on if shaking is severe.
• First 15 minutes: Evacuate on foot, inland and uphill, or go vertical if high ground is out of reach.
• First hour: Stay on high ground as the first waves arrive, and expect more.
• Hours 1 through 8 and beyond: Monitor alerts, text family, and prepare for aftershocks while the wave train continues.
• All-clear: Return only when emergency officials say it is safe.

Caught in the Water: How to Survive a Tsunami Current

A clear plan for the water gives you a fighting chance if escape fails. Tsunami water is extremely dangerous. It moves with enormous force and carries cars, trees, and pieces of buildings. Your best defense is evacuating early. If the water reaches you anyway, the steps below give you the best odds, followed by a checklist of the full timeline.

Survival Steps in the Current

1. Grab something that floats. Hold onto a door, a log, a cooler, or any large object that stays on the surface. It keeps your head up and saves your strength.
2. Ride the current. Let the water carry you instead of swimming against it. Swimming against a tsunami current burns energy you need later.
3. Protect your head and lead with your feet. Keep your feet in front of you to push off debris, and use your arms to shield your head.
4. Climb onto something sturdy. If you pass a roof, a solid structure, or a large stable object above the water, get on it and hold tight.
5. Conserve energy until the water slows. Breathe steadily, hang on, and wait for the current to ease before you try to reach safety.

Hazards After Rescue

Getting out of the water is a huge relief, and a few hazards remain. Floodwater often carries sewage, fuel, and chemicals, so wash any wounds with clean water as soon as you can. Get medical attention for cuts, even small ones, because they can become infected quickly. Watch for downed power lines and stay well clear of them, since water can carry electric current. Keep to high ground until officials give the all-clear, because more waves may still be coming.

Your Checklist From First Shake to All-Clear

Here is what to do during a tsunami, in order, so you can picture each step before you need it.

• Recognize. Treat long or strong shaking, a receding or rising sea, a roar, or an official alert as your signal.
• Protect. Drop, cover, and hold on until severe shaking stops.
• Evacuate. Go on foot, inland and uphill, following evacuation signs.
• Go vertical if needed. Climb to the third floor or higher of a reinforced concrete building.
• Wait. Stay on high ground for hours and monitor official alerts.
• Survive the water. Grab something that floats, ride the current, and protect your head.
• Return. Head back only after officials give the all-clear.

Learn your local evacuation routes this weekend, and build an emergency kit with water, food, a radio, a flashlight, and first aid supplies. For the wider picture of tsunami preparedness, the Prepper Life guide Tsunami Basics and How to Prepare Your Family covers how tsunamis form and how to get your household ready.