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Tsunami Preparedness Guide

Tsunamis (pronounced soo-ná-mees), also known as seismic sea waves (mistakenly called “tidal waves”), are a series of enormous waves created by an underwater disturbance such as an earthquake, landslide, volcanic eruption, or meteorite. A tsunami can move hundreds of miles per hour in the open ocean and smash into land with waves as high as 100 feet or more.

From the area where the tsunami originates, waves travel outward in all directions. Once the wave approaches the shore, it builds in height. The topography of the coastline and the ocean floor will influence the size of the wave. There may be more than one wave and the succeeding one may be larger than the one before. That is why a small tsunami at one beach can be a giant wave a few miles away.

All tsunamis are potentially dangerous, even though they may not damage every coastline they strike. A tsunami can strike anywhere along most of the U.S. coastline. The most destructive tsunamis have occurred along the coasts of California, Oregon, Washington, Alaska, and Hawaii.

Earthquake-induced movement of the ocean floor most often generates tsunamis. If a major earthquake or landslide occurs close to shore, the first wave in a series could reach the beach in a few minutes, even before a warning is issued. Areas are at greater risk if they are less than 25 feet above sea level and within a mile of the shoreline. Drowning is the most common cause of death associated with a tsunami. Tsunami waves and the receding water are very destructive to structures in the run-up zone. Other hazards include flooding, contamination of drinking water, and fires from gas lines or ruptured tanks.


What to do Before and During a Tsunami

The following are guidelines for what you should do if a tsunami is likely in your area:

  • Turn on your radio to learn if there is a tsunami warning if an earthquake occurs and you are in a coastal area.
  • Move inland to higher ground immediately and stay there.
  • Stay away from the beach. Never go down to the beach to watch a tsunami come in. If you can see the wave you are too close to escape it.
  • CAUTION - If there is noticeable recession in water away from the shoreline this is nature's tsunami warning and it should be heeded. You should move away immediately.

What to Do After a Tsunami

The following are guidelines for the period following a tsunami:

  • Stay away from flooded and damaged areas until officials say it is safe to return.
  • Stay away from debris in the water; it may pose a safety hazard to boats and people.
  • Save yourself - not your possessions
All information above is from FEMA's website under disaster and emergency preparedness.



For more information and resources on Tsunami Preparedness, please visit the web sites below.



US Department of Homeland Security - FEMA
http://www.fema.gov/

FEMA “Are you Ready?” Online Publication – An in-depth 204-page guide to emergency preparedness.

English Version
http://www.fema.gov/pdf/areyouready/areyouready_full.pdf

US National Weather Service - NOAA
http://www.weather.gov/

US NOAA National Tsunami Warning Center
http://ptwc.weather.gov/

American Red Cross
http://www.redcross.org/

American Red Cross Tsunami Preparedness
http://www.redcross.org/prepare/disaster/tsunami

American Red Cross Preparedness Checklists
http://www.redcross.org/prepare/disaster-safety-library

Ready Gov
http://www.ready.gov/

Ready Gov - Tsunami Preparedness
http://www.ready.gov/tsunamis

CDC - Center For Disease Control and Prevention
http://www.cdc.gov/

CDC - Tsunami Preparedness
http://emergency.cdc.gov/disasters/tsunamis/

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