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As the waves approach the shallow coastal waters, they appear normal and the speed decreases.
Then, as the tsunami nears the coastline, it turns into a gigantic, forceful wall of water that smashes into the shore with speeds exceeding 600 miles per hour (965 km/h)!
Usually tsunamis are about 20 feet (6 m) high, but extreme ones can get as high as 100 feet (30 m) or more!
A tsunami is a series of waves and the first wave may not be the largest one, plus the danger can last for many hours after the first wave hits. During the past 100 years, more than 200 tsunamis have been recorded in the Pacific Ocean due to earthquakes and Japan has suffered a majority of them.
The Pacific Ocean tsunami warning system was put in place back in 1949. As of June 2006, the Indian Ocean has a tsunami warning system, and NOAA expanded the Pacific system to include the Caribbean, the Gulf of Mexico and areas of the Atlantic around the U.S. coast as of mid-2007.
Did you know...
...a tsunami is not a tidal wave - it has nothing to do with the tide?!
...another name used to describe a tsunami is “harbor wave”
...“tsu” means harbor and “nami” means wave in Japanese?!
...sometimes the ocean floor is exposed near the shore since a tsunami can cause the water to recede or move back before slamming in to shore?!
...tsunamis can travel up streams and rivers that lead to the ocean?!
BEFORE A TSUNAMI:
Learn the buzzwords - Learn words used by both the West Coast / Alaska Tsunami Warning Center (WC/ATWC - for AK, BC, CA, OR, and WA) and the Pacific Tsunami Warning Center (PTWC - for international authorities, HI and all U.S. territories within Pacific basin) for tsunami threats...
Learn risks - If new to area, call local emergency management office and ask what the warning signals are and what to do when you hear them. Coastal areas less than 25 feet above sea level and within a mile of shoreline along coasts are at greatest risk. Or visit www.tsunamiready.noaa.gov
Make a plan - Develop a Family Emergency Plan (e.g. establish meeting places, list of emergency contact #s, out of state contact person, etc) and Disaster Supplies Kits.
Listen - Make sure you have a battery-operated radio (with spare batteries) for weather forecasts and updates. (Radios like Environment Canada’s Weatheradio and NOAA’s Weather Radio have a tone-alert feature that automatically alerts you when a Watch or Warning has been issued.)
Water signs - If near water or shore, watch for a noticeable rise or fall in the normal depth of coastal water - that’s advance warning of a tsunami so get to high ground. Also - if water pulls away from shoreline and exposes sea floor - run to higher ground ASAP!!
Feeling shaky...? - If you feel an earthquake in the Pacific Coast area (from Alaska down to Baja), listen to the radio for tsunami warnings.
Is that it...? - Don’t be fooled by the size of one wave - more will follow and they could get bigger … and a small tsunami at one beach can be a giant wave a few miles away!
Be ready to evacuate - Listen to local authorities and leave if you are told to evacuate.
DURING A TSUNAMI:
Leave - If you are told to evacuate, DO IT! Remember - a tsunami is a series of waves - the first one may be small but who knows what the rest will bring. Grab your BOB/Disaster Supplies Kit and GO!
IF ON OR NEAR SHORE - Get off the shore and get to higher ground quickly! Stay away from rivers and streams that lead to the ocean since tsunamis can travel up them too. You cannot outrun a tsunami ... if you see the wave it’s too late!
IF ON A BOAT - It depends where you are -- either get to land or go
further out to sea ...
Don’t go there - Do NOT try to go down to the shoreline to watch and don’t be fooled by size of one wave - more will follow and they could get bigger so continue listening to radio and TV.
AFTER A TSUNAMI:
Listen - Whether on land or at sea, local authorities will advise when it is safe to return to the area -- keep listening to radio and TV updates.
Watch out - Look for downed power lines, flooded areas and other damage caused by the waves.
Don’t go in there - Try to stay out of buildings or homes that are damaged until it is safe to enter and wear sturdy work boots and gloves when working in the rubble.
Strange critters – Be aware that the waves may bring in many critters from the ocean (marine life) so watch out for pinchers and stingers!
RED or GREEN sign in window – After a disaster, Volunteers and Emergency Service personnel may go door-to-door to check on people. By placing a sign in your window that faces the street near the door, you can let them know if you need them to STOP HERE or MOVE ON.
Either use a piece of RED or GREEN construction paper or draw a big RED or GREEN “X” (using a crayon or marker) on a piece of paper and tape it in the window.
-- RED means STOP HERE!
-- GREEN means EVERYTHING IS OKAY…MOVE ON!
-- Nothing in the window would also mean STOP HERE!
Insurance - If your home suffers any damage, contact your insurance agent and keep all receipts for clean-up and repairs.
Mold - Consider asking a restoration professional to inspect your house for mold. Also check out www.epa.gov/mold
Some additional things to check and do...
Above from IT'S A DISASTER! …and what are YOU gonna do about it? book (proceeds benefit USFRA) - learn more
Photo: Mainichi Shimbun/Reuters via NatGeo
West Coast / Alaska Tsunami Warning Center (WC/ATWC - for AK, BC, CA, OR, and WA)
Pacific Tsunami Warning Center (PTWC - for international authorities, HI and all U.S. territories within Pacific basin)
Flood safety tips on USFRA
Earthquakes mitigation & safety tips on USFRA
USFRA's Disaster Preparedness Links