Abstract:

In recent years, the differential Interferometric Synthetic Aperture Radar (DInSAR) technique has been widely used in the earths surface deformation monitoring, including the displacements caused by earthquake, volcano activity, glacier movement, ground subsidence, active fault and landslides Compared with the conventional approaches (such as GPS monitoring), applying the DInSAR technique has many advantages in surface deformation monitoring Firstly, the SAR satellite works all the time, and it is not affected by climatic changes Secondly, the spatial resolution is high Thirdly, the images can cover a large area on the earth Finally, the continuous displacement information of the ground can be achieved In this paper, the DInSAR technique is used to study the tectonic deformation characteristics of the eastern segment of the Altyn Tagh Fault, which is an important crustal deformation boundary on the northeastern margin of the Tibetan Plateau To the north of this boundary, the surface deformation is weak and uniform, while to the south it is strong but not uniform From the western part to the eastern part of this area, the deformation intensity gradually decreases Between these two parts there is the western part of the North Qilianshan Fault, where the minimum deformation intensity is about 10 cm In addition, there exist two linear intensive deformation belts in the southern area One is in N65 W direction, which is in accordance with the direction of the secondary compressionshear plane of the Altyn Tagh strikeslip fault zone The other is in a roughly NW direction, which is consistent with the trend of the western part of the North Qilianshan Fault

Key words:

Key words: DInSAR; the eastern segment of the Altyn Tagh Fault; tectonic deformation