Tsunami | Causes of Tsunami | Types of Tsunami

  The earth is constantly moving on large tectonic plates.  When these tectonic plates move past each other, collide and/or slide under one another (subduction), an earthquake results.  This is what happened with the recent tsunami that devastated Southern Asia.

Do you know about tectonic plates ? 

 
A tectonic plate (also called lithospheric plate) is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere.
       Plate size can vary greatly, from a few hundred to thousands of kilometers across; the Pacific and Antarctic Plates are among the largest. Plate thickness also varies greatly, ranging from less than 15 km  to about 200 km !!