the most damage. We sometimes call tsunamis tidal waves, though they're not caused by
tides. Oceanographers call tsunamis seismic sea waves. Whatever their name, those who
lived through them call them killers.
What actually a tsunami..?
It's a wave of water that sometimes follows earthquakes, volcanic eruptions, or underwater
landslides. Not all tsunamis are destructive. In fact if you were out to sea, a tsunami could
pass under your boat and you would hardly notice. That's because the ocean bottom is so
deep. But as the wave get closer to land, the ocean becomes shallower and begins to cause
the wave to crest. Some tsunamis can top 100 feet (30m) by the time they reach shore.
The largest tsunami ever measured was 212 feet (65m) high.
How fast a tsunami can travel..?
In deep water, a tsunami can travel as fast as 600 mph (1,000 kmph) per hour. It's important
to remember that a tsunami is usually made up of several waves moving together. The
distance from the crest of one wave to the crest of another can be as much as 100 miles
(160 km). So as large wave could hit, followed an hour or so later by still another
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