In the Eastern Alps, the indentation of the Adriatic promontory since the Cenozoic affected the kinematics of separate crustal domains bounded by faults that accommodate lateral extrusion processes and differential shortening. Deciphering the pattern of crustal stresses in the orogen interior is challenging, due to the lack of in situ stress measurements at crustal depths. We define stress regimes and the orientations of the most-compressive horizontal stress (S_Hmax) by integrating published results with new data, including stress analysis from fault plane solutions, estimation of crustal anisotropy through the shear wave splitting analysis, paleostress determination from fault slip data, and computation of cumulative seismic displacements. The retrieved regional S_Hmax are generally consistent with N-S convergence. In the northern part of the study area, current stress orientations are almost parallel to paleo-S_Hmax, suggesting a rather uniform compressional regime since the late Cenozoic. Conversely, sharp deflections and divergence with paleo-S_Hmax appear at the western border of the Adriatic promontory across major transpressive and extensional shear zones and in the Southalpine domain, indicating a change in tectonically induced second-order stresses. A current strike-slip regime with subordinate orogen-parallel seismic displacements affects a belt to north of the Periadriatic Lineament and NE-extension characterizes the Ortles-Engandine region. Seismic anisotropy locally exhibits fault-parallel fast axes (Brenner-Giudicarie fault-systems, Dinaric and Southalpine thrusts), whereas stress-induced anisotropy parallel to S_Hmax characterizes the southern part of the orogen. Cumulative seismic displacements are small compared to geodetic ones, and unravel partitioning of deformation into second-order transpressive and extensional belts in response to indentation.

中文翻译：

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东阿尔卑斯山的应力模式和地壳各向异性：地震和地质观测的见解

在东阿尔卑斯山，自新生代以来亚得里亚海海角的凹陷影响了以适应横向挤压过程和差异缩短的断层为界的单独地壳域的运动学。由于缺乏地壳深度的原位应力测量，破译造山带内部的地应力模式具有挑战性。我们通过将已发表的结果与新数据相结合来定义应力状态和最大压缩水平应力（S _Hmax）的方向，包括断层面解的应力分析、通过剪切波分裂分析估计地壳各向异性、根据断层滑动确定古应力数据和累积地震位移的计算。反演的区域S _Hmax与NS 收敛基本一致。在研究区北部，目前的应力方向几乎与古S _Hmax平行，表明自新生代晚期以来存在相当均匀的挤压状态。相反，在亚得里亚海海角的西部边界，跨越主要的挤压和伸展剪切带以及南高山区域，出现了与古南海_{Hmax的急剧偏转和分歧，表明构造引起的二阶应力发生了变化。}当前的走滑区具有与造山带平行的地震位移，影响着近地层线以北的带，而北东延伸则构成了奥尔特莱斯-恩甘丁地区的特征。地震各向异性局部表现出与断层平行的快轴（布伦纳-朱迪卡里断层系、第纳里克和南高山逆冲断层），而与SHmax平行的应力引起的各向异性则_表征了造山带的南部。与大地测量相比，累积地震位移较小，并且根据压痕将变形划分为二阶挤压带和伸展带。