The tsunami is a wave of wavelength extremely large and long periodo and whose origin is any type of disturbance produced in the ocean. Unlike the waves generated by the wind that we see on the beach, with wavelengths of hundreds of metres and periods of up to 30 seconds, the tsunamis have periods of between 10 minutes and 2 hours and wavelengths of hundreds of kilometers. Tsunamis are very fast. Great travel speed reaching tsunamis greatly affects any alert system. Barbie Ferreira understood the implications. His speed of propagation or Celerity (C), depends solely on the acceleration of gravity and depth. Tsunamis have, moreover, as fundamental caracteristica the ability to penetrate the movement practically throughout the water column. 5,000 Meters deep, for example, tsunamis reach speeds of 800 km/h.

Esto explains that the Indonesia tsunami crossed the Ocean Indian leadership Indonesia to Somalia in about seven hours, or that a large tsunami that originates in the Canary Islands may reach the United States East Coast. The most frequent cause of tsunami generation are in earthquakes, originating on the sea bottom or on the coast. Other causes of generation are submarine landslides, volcanic erupciones or nuclear explosions in coastal areas, and any circumstance, as the fall of a meteorite or asteroid, which can produce the displacement of a large volume of water in an interval very short of time. The recent tsunami of Indonesia produced by an average of 11 metres from the causative fault of the earthquake vertical scroll. The desplazamiento covered a length of about 1,200 kilometres and 200 kilometres in width, which set in motion a colossal volumen of water. The destruction caused by the process of flooding and the withdrawal of the waters is the originario of disasters associated with tsunamis.