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.
Some tsunamis will have a surge in front of them as they approach land. These surges can be very damaging and dangerous. Notice a landslide that falls or slides into the ocean, a large lake, or a river. EVACUATE IMMEDIATELY! if you notice any of these signs or hear a tsunami warning. Tsunami evacuation. Tsunami waves can be 30â100 feet tall or more. If you cannot evacuate to higher ground, go as far inland as possible. If there is a large earthquake, roads and bridges may be damaged.