The massive security operation surrounding Barack Obama's inauguration showed that he will be the most protected president in the history of the United States. Photo: REUTERS.
The physics of a tsunami. Tsunamis can have wavelengths ranging from 10 to 500 km and wave periods of up to an hour. As a result of their long wavelengths, tsunamis act as shallow-water waves. A wave becomes a shallow-water wave when the wavelength is very large compared to the water depth. where g is the acceleration due to gravity (= 9.8 m/s2) and H is the depth of water.
This deadliest tsunami 2004 caused by a 9.0 magnitude earthquake, killing more than 250,000 people in a single day is the most devastating tsunami in modern times, traveled 375 miles (600 km) in a mere 75 min. Thatâs 300 miles (480 km) per hour, leaving more than 1.7 million homeless affecting 18 countries.