The West Qinling orogen has played an important role in accommodating the deformation in the northeastern Tibetan Plateau induced by the India-Eurasia convergence. Here we construct a vertical land motion (VLM) model based on the latest leveling observations adjacent to the West Qinling orogen. Combined with the horizontal deformation field, the crustal deformation pattern in this area is analyzed. Additionally, slip rate and coupling coefficients of the West Qinling fault, the longest fault separating the West Qinling orogen from the Lanzhou (Longxi) block, are inverted and constrained with GPS and VLM observations. Results show that the West Qinling fault slips slowly at a rate of 1–2 mm/yr and is strongly coupled with a moment magnitude deficit of Mw7.4. The crustal uplift rates adjacent to the West Qinling orogen are 0–3 mm/yr; which combined with 0–12.5ⅹ10−9/yr contraction rates, suggests that strain transformation plays a key role in controlling the tectonic uplift in the West Qinling orogen, and furthers our understanding of the contemporary geomorphic and topographic features. We identify a significant deformation transition belt at longitudes of 105°–106°E, which indicates that crustal deformation, induced from the northeastern expansion of the Tibetan Plateau, is mainly constrained to the plateau, rather than accommodated by crustal materials eastward escaping along the Qinling Mountains.

中文翻译：

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西秦岭造山带附近的应变转换：对青藏高原东北部生长的启示

西秦岭造山带在适应印度-欧亚大陆辐合引起的青藏高原东北部变形方面发挥了重要作用。在这里，我们基于西秦岭造山带附近的最新水平观测构建了垂直陆地运动（VLM）模型。结合水平变形场，分析了该区地壳变形模式。此外，西秦岭断层是将西秦岭造山带与兰州（龙溪）地块分开的最长断层，其滑动速率和耦合系数通过 GPS 和 VLM 观测进行反演和约束。结果表明，西秦岭断裂以 1-2 mm/yr 的速度缓慢滑动，并与 Mw7.4 的矩震级缺陷强烈耦合。与西秦岭造山带相邻的地壳隆升速率为 0～3 mm/yr；结合0-12.5ⅹ10-9/年的收缩率，表明应变转换在控制西秦岭造山带构造隆升中起关键作用，并进一步加深了我们对当代地貌和地形特征的理解。我们在 105°～106°E 经度处识别出一条显着的变形过渡带，表明青藏高原东北扩张引起的地壳变形主要受高原影响，而不是由地壳物质向东逃逸秦岭。