The causes of Tsunamis

Tsunami's have been around for many years, they are deadly water waves that kill many people and demolish cities. Just a few years ago in 2004, we had a terrible Tsunami that did so much damage that they are still repairing. Some causes of Tsunami's are when the destructive plates move abruptly and vertically displace the overlying water. Subduction zone related earthquakes generate the majority of all Tsunami's. At the beginning of all Tsunami's, the water level only swells 300mm above normal sea level. A Tsunami can occur at any state of a tide, and even at low tide will still inundate coastal areas if the incoming waves surge high enough. Some Tsunami's can reach all the way across an ocean. There are some smaller Tsunami's that happen in Japan that can devastate nearby coasts within 15 minutes. Could you imagine, a small Tsunami can completely demolish a coast in 15 minutes, could you imagine how fast a big Tsunami could demolish a coast! In the 1950's it was hypothesized that larger Tsunami's were created by landslides, explosive volcanic eruptions, and impact events when they contact water.