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鲜水河断裂是青藏高原东部边缘附近的高活动性走滑断层系统。我们使用多干涉图方法由ERS-1/2和欧洲环境卫星所获得的十年SAR数据来构建由于鲜水河西北段地震间应变积累而产生的视距形变速率图。该速率图显示了与断层有关的清晰的形变梯度,但是从地表断层迹线看稍向东偏移。通过使用蒙特-卡洛方法对InSAR速率图和GPS数据的共同反演,当锁定深度为3～6km时,以90%置信水平估算出滑动速率为9～12mm/a。此滑动速率与全新世断层滑动速率及历史地震相吻合。我们的结果也揭示不存在显著的跨断层拉伸。将来,上升和下降轨道得出的InSAR数据可能会进一步约束此断层的3D断层滑动速率。
The Xianshuihe fault is a highly active strike-slip fault system near the eastern edge of the Qinghai-Xizang Plateau. We use the multi-interferogram method from the 10-year SAR data obtained from ERS-1/2 and the European Environmental Satellite to construct a line-of-sight strain rate profile due to the strain build-up between the Seismic northwaters of the Xianshui River. The rate map shows a clear deformation gradient associated with the fault, but a slight eastward offset from the surface fault trace. By using the Monte Carlo method to reconstruct InSAR velocity maps and GPS data, the slip rate is estimated to be 9-12 mm / a at a 90% confidence level when the lock depth is 3 ~ 6 km. This slip rate coincides with the Holocene fault slip rate and historical earthquakes. Our results also reveal that there is no significant cross-sectional stretch. In the future, InSAR data derived from ascending and descending orbits may further constrain the 3D fault slip rate for this fault.