Tsunamis (giant waves) evolve from ocean-generated earthquakes.
The Indian Ocean tsunami of December 26, 2004, was the worst tsunami (in terms of loss of life) in recorded history.
When you first arrive in a foreign country, ask the concierge at your hotel whether the country has a tsunami warning system? If the response is yes, ferret out every detail about the warning system. If not, be predictably alert to all large bodies of sea water.
In coastal areas, tsunamis can reach a height of 30 feet or greater, although the 2004 tsunami actually reached 108 feet.
Tsunamis can move inland for a considerable distance and at a speed faster than a person can run.
When you can see the wave of a tsunami, you are too close to escape:
1. If you are at the beach or near the ocean and you feel the earth shake, move immediately to higher ground;
2. Approaching tsunamis forewarn with the noticeable rise or fall of coastal waters;
3. An approaching tsunami usually emits a loud roar that sounds very much like a train or aircraft; and
4. High, multi-story, reinforced concrete hotels are located in many low-lying coastal areas. The upper floors of these hotels can provide a tentative safe place to find refuge should a tsunami warning occur and you cannot move quickly inland to higher ground.