西藏亚东-谷露裂谷带运动特征的InSAR研究

摘要

亚东谷露裂谷等南北向分布的大型地堑在青藏高原新生代构造演化中发挥着重要作用,该研究对理解青藏高原中南部地堑在第四纪构造演化的地位具有重要意义.基于欧空局Envisat卫星2003～2008年SAR数据,利用SBAS时序InSAR技术,去除地形、大气、轨道等因素的影响,获取亚东谷露裂谷带及邻区的LOS速度场,并反演亚东谷露裂谷带的滑动速率和闭锁深度.结果表明,亚东-谷露裂谷带南段与北段具有相同的倾滑速率,均为1 mm/a;其闭锁深度南段为31 km,北段为22 km;其断层倾角南段为52°,北段为40°,与地质结果一致.%The Yadong-Gulu rift in the Tibet plateau plays a very important role intectonic evolution in the Cenozoic Era.Its examination helps to understand the role central and southern Tibet rifts played in the evolution of the Tibet Plateau in the Quaternary.Based on 26 ENVISAT synthetic aperture radar(SAR) scenes during the period from 2003 to 2008,we take the SBAS-InSAR technology to calculate the time-dependent LOS velocity field of Yadong-Gulu rift and the surrounding region,in which the errors induced by terrain,orbit data and the atmosphere model have been detected.The results of the slip rate,which is inverted by the LOS direction deformation,show that the southern and northern portionsof the rift have a similar dip slip rate of about 1 mm/a.The locking depth is 31km in the southern section and 22 km in the northern section.The inversion of fault dip angle in the southern and northern sections is 52° and 40° respectively.