A magnitude 9.0 earthquake,which was the strongest earthquake in the past four decades,occurred just off the northwest coast of Sumatra,Indonesia,on December 26,2004.It caused serious damage and casualties.

• 2004年12月26日印度尼西亚苏门答腊西北海域发生40年来最强烈的地震,造成巨大伤亡和财产损失。