Tsunami's

Tsunami's are not very nice incidents to experience and they usually occur quite a few times per year.
 They are very deadly and they are stronger than you think. They can detonate buildings,kill people, obliterate houses, bend road signs and lot's more.
 The average hight of a tsunami is only about 2-3 foot (60-90 cm). BUT!!!!! They are so fast that they can go faster than a jet plane!!! Also they have recorded tsunami's at  3000 metres!!!!! (3 KM) But those tsunamis don't really occur in a civilisation when people are around. They only occur in landslides for some reason. Tsunami's like that are called megatsunami's.
Tsunami's are caused by other incidents such as Earthquakes,Volcanic eruptions and underwater explosions like nuclear bombs hitting the water or an asteroid or a metorite.