2004年苏门答腊地震引起的远场形变

FAR-FIELD DEFORMATION CAUSED BY 2004 SUMATRA EARTHQUAKE

用球体位错理论计算2004年苏门答腊地震在川滇地区形成的理论水平位移场,结果表明,理论计算值与利用GPS观测数据获得的该地震在川滇地区引起的同震水平位移场观测值基本吻合。在此基础上,进一步计算了该地震引起的全球和中国大陆及周边地区同震位移场、应变场、重力和大地水准面变化。

The theoretical horizontal dispalcement field caused by the 2004 Sumatra earthquake in the Sichuan- Yunnan area was calculated according to the spherical dislocation theory. The results show that the theoretical value of displacement field is basically consistent with the observed value in situ with GPS. On this basis,we have calculated the co-seismic displacement field, strain field, changes of gravity and geoid of the whole Earth and China mainland and vicinity caused by the Sumatra earthquake.