tsunami
Hazard Guide
Tsunami
Long-wavelength sea waves caused by seismic events that can inundate coastal zones with little warning.
Overview
Understanding Tsunami
Tsunamis are rare but high-impact events. Fast self-evacuation from coastal areas is vital when warnings are issued.
Overview
Summary
A tsunami is a series of powerful ocean waves usually caused by underwater earthquakes, volcanic eruptions, or landslides. These waves can travel rapidly across the ocean and grow in height as they approach coastal areas, causing severe flooding and destruction.
Preparedness
Preparedness
Being prepared can save lives in the event of a tsunami:
- Know if you live, work, or visit areas near the coast that are at risk
- Learn the natural warning signs, such as strong or long earthquakes, a sudden rise or fall in sea level, or a loud roaring sound from the ocean
- Sign up for local emergency alerts and warning systems
- Prepare an emergency kit with essentials like water, food, first aid supplies, and important documents
- Identify tsunami hazard zones and safe evacuations routes from your home, workplace, school or hotel
- Know the locations of higher ground and inland areas away from the coast
- Prepare and emergency go bag with water, food, medications, flashlights and important documents
- Conduct regular evacuation drills with family members and staff
Response
Response and Safety Measures
If a tsunami is expected or occurs:
- Move immediately to higher ground or inland after a strong earthquake or official warning.
- Do not wait to see the wave, act quickly.
- Stay away from beaches and coastal areas.
- Follow evacuation orders and instructions from authorities.
- Remain in a safe area until officials declare it safe to return, as multiple waves can occur.