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Tsunamis can originate thousands of kilometres out to sea, reaching wave heights of up to 30 metres and speeds of up to 720 km/h.
 
The GREATEST RISK is for areas up to 30 meters above sea level and less than 2 km from the coast, which in the case of Ecuador covers a significant area where thousands of people live.
 
A tidal wave or tsunami occurs as a series of rises and falls in sea level, spaced 5 to 90 minutes apart. 
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