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2008年10月6日在西藏当雄发生了Mw 6.3地震.我们从一对降轨ENVISAT ASAR资料获得了这次地震的同震位移场,通过同震位移场的反演确定了发震断层参数.并且应用一维变异理论评估了InSAR结果中的误差协方差矩阵,直接用于评价断层反演参数的不确定性水平.结果表明,此次地震发生于羊易盆地东缘的次级断层,走向178°,倾角58°,倾向近正西,以正断层运动为主,兼具少量右旋走滑分量,且资料的误差水平对反演结果的影响不大.这次地震引起震中位置地表下沉至少30 cm,似乎是亚东谷露裂谷带北段的羊易地堑下沉的表现.
The Mw 6.3 earthquake occurred in Dangxiong, Tibet, on October 6, 2008. We obtained the coseismic displacement field of this earthquake from a pair of orbiting ENVISAT ASAR data and determined the seismogenic fault parameters by inversion of the coseismic displacement field The error covariance matrix in InSAR results was evaluated by using one-dimensional variation theory, which was directly used to evaluate the uncertainty of fault inversion parameters.The results show that the earthquake occurred in the secondary fault on the eastern margin of Yangyi basin, With a dip of 178 °, a dip of 58 ° and a tendency of nearly normal to the west, are mainly normal faults with a small amount of right-lateral strike-slip components, and the data error level has little effect on the inversion results. Sinking at least 30 cm seems to be a manifestation of the subsidence of the Sheep-Yi Graben in the northern segment of the Yadonggullu rift valley.