Crustal dilatation observed by GRACE after the 2004 Sumatra-Andaman earthquake
Crustal dilatation observed by GRACE after the 2004 Sumatra-Andaman earthquake
复制标题
DOI：
10.1126/science.1128661
复制
发表时间：
2006-08-04
期刊：
影响因子：
56.9
通讯作者：
Kuo, Chung-Yen
中科院分区：
文献类型：
--
作者：
Han, Shin-Chan;Shum, C. K.;Kuo, Chung-Yen
我们报告的检测地震的天基测量。重力恢复和气候实验（GRACE）卫星观测到了12月大地震引起的+/-15微伽利略重力变化。2004年苏门答腊地震同震形变通过地球层状密度结构的垂直位移和壳幔密度的变化，使重力场发生突变。GRACE对长距离空间的敏感性。重力变化的波长导致重力测量中垂直位移和膨胀效应的贡献大致相等。GRACE观测提供了海底地震造成地壳扩张的证据。
We report the detection of an earthquake by a space-based measurement. The Gravity Recovery and Climate Experiment (GRACE) satellites observed a +/-15-microgalileo gravity change induced by the great December. 2004 Sumatra-Andaman earthquake. Coseismic deformation produces sudden changes in the gravity field by vertical displacement of Earth's layered density structure and by changing the densities of the crust and mantle. GRACE's sensitivity to the long spatial. wavelength of gravity changes resulted in roughly equal contributions of vertical displacement and dilatation effects in the gravity measurements. The GRACE observations provide evidence of crustal dilatation resulting from an undersea earthquake.