Japenese Earthquake 2011 What Happened? March 11 2011 a cateogory 8.9 earthquake triggered off the SE coast of Japan. This event triggered a Tsunami that struck the South East Coast of Japan. How are Tsunamis Formed? Secondary Hazard Tsunamis are rare events caused by destructive plate boundaries when plates move. What were the Impacts? Environmental EffectsEffects on the Environment Human EffectsEffects that impact humans. ResponsesLong Term ResponsesShort Term Responses