In this study, we utilize C-band Sentinel-1 radar images from 2015 to 2022, combined with interseismic horizontal GNSS velocities, to construct large-scale, high-resolution, 3-D velocity and strain rate maps over a vast region of southern Tibet. We show the distribution of prevailing dilatational strain accumulation along the seven major rift zones. Using 2-D elastic dislocations invoking a two-fault model in a Bayesian framework, we quantified the decadal extension rates across the seven rift zones, and we suggest a total extension rate of 18.4 ± 1.7 mm/yr, consistent with geological and geodetic estimates. The resulting strain rate maps, combined with the earthquake catalog, help us identify areas with high earthquake potential. Our study enhances our understanding of the present-day tectonics and kinematics in southern Tibet and provides important constraints for seismic hazard assessment in this region.

中文翻译：

---

来自 Sentinel-1 InSAR 和 GNSS 数据的藏南大规模拉伸应变


在本研究中，我们利用 2015 年至 2022 年的 C 波段 Sentinel-1 雷达图像，结合地震间水平 GNSS 速度，在藏南广大地区构建了大规模、高分辨率的三维速度和应变速率图。我们显示了沿 7 个主要裂谷带的主要扩张应变积累的分布。使用调用贝叶斯框架中双断层模型的二维弹性位错，我们量化了七个裂谷带的年代际延伸率，我们建议总延伸率为 18.4 ± 1.7 毫米/年，与地质和大地测量估计一致。生成的应变率图与地震目录相结合，有助于我们识别具有高地震可能性的区域。我们的研究增强了我们对藏南地区当今构造和运动学的理解，并为该地区的地震灾害评估提供了重要的约束条件。