TSUNAMI

Tsunami is the transfer of water bodies caused by changes in sea surface vertically with a sudden. Changes in sea level can be caused by an earthquake centered bumiyang
under sea, underwater volcanic eruptions, underwater landslides, or meteor hit the ocean. Tsunami waves can propagate in all directions. Power contained in the tsunami wave is fixed to the function height. In the deep ocean, tsunami waves can propagate with a speed of 500-1000 km per hour. Equivalent to the speed of aircraft. Deep-sea wave height is only about 1 meter. So, wave speed is not felt by the ship which was in the middle of the sea.
Tsunamis can occur if an interruption occurs that causes the movement of large amounts of water, such as volcanic eruptions, earthquakes, landslides meteor who fell to earth. However, 90% of the tsunami is an earthquake under the sea. In recording the history of some of the tsunami caused by the volcano eruption, for example when the eruption of Mount Krakatoa.
The quake that caused tsunami
1. An earthquake centered in the middle of the sea and shallow (0-30 km)
2. An earthquake with a strength of at least 6.5 on the Richter Scale
3. An earthquake with a pattern of reverse fault or fault down
Tsunami in history
1. 1 November 1755 - The tsunami destroyed Lisbon, the capital of Portugal, and claimed 60,000 lives.
2. 1883 - On August 26, Krakatoa eruption and tsunami killed more than 36,000 inhabitants.
3. 2004 - On 25-26 December 2004, the massive earthquake that caused the tsunami claimed over 250,000 lives in South Asia, Southeast Asia and Africa. The height of the tsunami of 35 m.