A strong earthquake felt in a low-lying coastal area is a natural warning of possible, immediate danger. Keep calm and quickly move to higher ground, away from the coast.
All large earthquakes do not cause tsunamis, but many do. If the quake is located near or directly under the ocean, the probability of a tsunami increases. When you hear that an earthquake has occurred in the ocean or coastline regions, prepare for a tsunami emergency.
A tsunami is not a single wave, but a series of waves. Stay out of danger until an “all clear” is issued by competent authority.
Approaching tsunamis are sometimes heralded by noticeable rise or fall of coastal water. This is nature’s tsunami warning and should be heeded.
A small tsunami at one beach can be a giant a few miles away. Don’t let the modest size of one make you lose respect for all.
Sooner or later, tsunamis visit every coastline in the Pacific. All tsunamis – like hurricanes – are potentially dangerous even though they may not damage every coastline they strike.
Never go down to the beach to watch for a tsunami. WHEN YOU CAN SEE THE WAVE YOU ARE TOO CLOSE TO ESCAPE.
During a tsunami emergency, your local emergency management office, police, and other emergency organizations will try to save your life. Give them your fullest cooperation.
Stay tuned to your radio, marine radio, NOAA Weather Radio, or television stations during a tsunami emergency – bulletins issued through your local emergency management office, and National Weather Service offices can save your life.
Here is a USGS video about the 1964 ‘Megathrust’ Quake and Tsunami in Alaska. http://youtu.be/lE2j10xyOgI
Here are some Tsunami links:
http://www.jacksjoint.com/tidalwave.htm – 1964 Alaska Earthquake and Tsunami U.S. Coast Guard radio traffic
http://www.fema.gov/kids/tsunami.htm – For kids: Tsunami
http://ptwc.weather.gov/ – Check here for latest Tsunami Warnings for everywhere except the North American West Coast
http://itic.ioc-unesco.org/index.php – International Tsunami Information Center
http://seagrant.oregonstate.edu/earthquakes-and-tsunamis – Impact of Tsunamis on Coastal Communities in the U.S. state of Oregon
http://www.soest.hawaii.edu/coasts/nps/tsunamiHazards.php – Tsunamis in Hawaii
http://www.ngdc.noaa.gov/hazard/tsu.shtml – NGDC Tsunami Database
http://ntwc.arh.noaa.gov/ – North American West Coast ONLY – Tsunami Warnings
http://www.tsunami.org/index/index.html – Pacific Tsunami Museum
http://earthweb.ess.washington.edu/tsunami/index.html – Tsunami General Information
http://nctr.pmel.noaa.gov/ – Tsunami Hazard Mitigation Program
http://nctr.pmel.noaa.gov/tsu_links.html – Tsunami Hazard Links
http://www.tsunamiresearchcenter.com/ – Tsunami Research Center
http://earthweb.ess.washington.edu/tsunami/miscellaneous/relsites.html – More Tsunami Links
This information came from the Alaska Tsunami Warning Center safety page.