西藏亚东-谷露地堑分段滑移速率的GPS/InSAR监测与构造意义

项目名称： 西藏亚东-谷露地堑分段滑移速率的GPS/InSAR监测与构造意义

项目编号： No.41274027

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 乔学军

作者单位： 中国地震局地震研究所

项目金额： 70万元

中文摘要： 大量分布的南北向大型地堑（裂谷带）在青藏高原新生代构造演化中发挥过重要作用,是制约高原地形地貌、构造块体运动及强震活动等的控制因素,但由于断层活动定量化的地震地质和大地测量数据等关键资料的不足,对这些断层在第四纪青藏高原南北向缩短、东西向伸展变形过程中的调节作用仍认识有限.本研究拟以横跨雅鲁藏布江缝合带,500公里长的亚东-谷露地堑为对象，开展GPS、InSAR监测,通过加密观测，建立数条跨断层的地壳位移速度剖线,结合该地区已有的地震地质及地球物理资料，将GPS与InSAR融合,精确测定亚东-谷露断裂带各段的运动速率、几何学特征,并反演计算断裂带各段的闭锁深度，研究该断裂带构造活动特征及其与强震的关系,探索断层闭锁深度与深部构造活动的关系,揭示亚东-谷露地堑的构造意义，以澄清青藏高原中南部地堑在青藏高原第四纪构造演化的地位。

中文关键词： 亚东-谷露裂谷带；GPS；InSAR；雅鲁藏布缝合线；地壳形变

英文摘要： A lot of large scale SN-trend rifts distributed in the Tibet plateau. Those rifts have played a very important role during the evolution of tectonics in the Cenozoic Era. Also, it is a key point for the topographic changes, tectonic block movements and the seismic activities. But the lack of quantified descriptions of seismic geology and geodesy in this area makes it very limited to understand the adjustment role of those faults how to shorten along SN and how to extend along WE within the plateau in the Quaternary. This study is focused on the 500km-long Yadong-Gulu rifts which stretches over the Yaluzangbu suture zone. GPS and InSAR will be used to monitor the crustal deformation and to derive an accurate 3-d velocity map of the area. We expect to densify the existed GPS network and form several profiles across the rift and then to integrate the GPS and InSAR measurements to derive the velocity maps and geometry of different segments of the rift, cooperated with geology and geophysics data. Finally, we will inverse the lock depth of different segments and investigate the relationship between crustal deformation features and strong earthquakes as well as relationship between the lock depth and deep struture. It will help us to best understand the characteristics of Yadong-Gulu rift and to clarify the role of r

英文关键词： Yadong-Gulu rift；GPS；InSAR；Yarlung-Zangbo suture；Crustal deformation