Long-term seismic activity prior to the December 26, 2004, off the west coast of northern Sumatra, Indonesia, M_W=9.0 earthquake was investigated using the Harvard CMT catalogue.

• 使用哈佛CMT资料；研究了2004年12月26日印尼北苏门答腊以西近海MW9.；0地震前的长期地震活动