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2008-11-10青海大柴旦地区发生了Mw 6.3级地震,其发震断层位于青藏高原东北缘的大柴旦-宗务隆山断裂带。利用欧空局Envisat/ASAR卫星雷达影像数据,采用二通差分干涉技术获得了地震的同震地表形变场,基于1D协方差函数估计InSAR同震形变场的中误差为0.52cm,方差-协方差衰减距离为5.9km。在此基础上,采用弹性半空间矩形位错模型进行断层几何参数反演,并利用断层自动剖分技术确定了地震的最佳同震滑动分布模型。结果表明,该地震的震源机制解为走向107.19°,倾角56.57°,以逆冲为主兼具少量右旋走滑分量;滑动分布主要发生在10～20km深度范围内,最大滑动量为0.51m,释放的能量为4.3×1018 Nm。
2008-11-10 Mw 6.3 earthquake occurred in the Dachaichaan area of Qinghai Province. Its seismogenic fault is located in the Dachaichaan-Zongrou Longshan fault zone on the northeastern margin of the Qinghai-Tibet Plateau. Using the ESA satellite image data of Envisat / ASAR, the co-seismic surface deformation field of the earthquake was obtained by two-way differential interference technique. The error of covariance deformation of InSAR was 0.52cm based on 1D covariance function. The variance-covariance The attenuation distance is 5.9km. On this basis, the rectangular half-space rectangular dislocation model is used to carry out inversion of fault geometry parameters, and the optimal coseismic slip distribution model of the earthquake is determined by means of fault automatic dissection technology. The results show that the focal mechanism of the earthquakes is about 107.19 ° and 56.57 ° inclination, mainly thrusting with a small amount of dextral strike-slip component. The slip distribution mainly occurs in the depth range of 10 ~ 20 km with a maximum slip of 0.51 m , The energy released is 4.3 × 1018 Nm.