tsunamis

Many tsunamis occur each year, but one of the most deadly tsunamis occurred in 2004. The tsunami was triggered by an undersea Megathrust earthquake. The earthquake, known as the Sumatra-Andaman earthquake, was the second biggest tsunamis ever recorded, the Magnitude is between 9.1 and 9.3. The earthquake set off the tsunami.

How does the tsunami happend

  Is a catastrophic tsunami waves, usually by the source on the seabed within the next 50 kilometers, more than 6.5 Richter scale earthquake in the seabed. Underwater or coastal landslides or volcanic eruptions can also be caused by the tsunami. In a shock, the shock wave in the sea in order to expand the circle, spread to great distances, as pebbles falling into the shallow waves generated by the same pond. Tsunami wavelength than the maximum depth of the sea also, and orbital motion in the seabed near the block did not by much, no matter the depth of the ocean, the wave can be spread over the past.