Source of Tsunami

 
 
• subduction zones(where an oceanic plate subsides under the continental plate)

- Subtion zones have a number of earthquakes. When an 

earthquake occur in the sea and large areas of the sea 

floor eleveate or subside, a tsunami can be generated

                        www.pubs.usgs.gov/publications/text/understanding.html

• Volcanos

-collapse of all or part of the volcanic edifice, subsidence,

an explosion, a landslide, and an earthquake accompanying or 

preceding the eruption

-In Indonesia(1883), the tsunami caused by Krakatoa eruption 

killed 36,000 people

 
• Landslides(on land or in the sea)

-Lituya bay, Alaska, 1958, the earthquake-induced rockslide

produced a bigsplash wave which removed trees to a height of 525m

Lander and Lockridge,United States tsunamis

• cosmic collisions

  -cosmic-body impacts disturb the water surface, as momentum 

   of falling debris is transferred to the water into which 

   the debris falls