Analyzing the partitioning of stress and deformation in active orogenic settings is of fundamental importance for understanding the mechanisms driving the geodynamic evolution and seismicity, particularly in complex orogenic settings. In this respect, a quantitative understanding is obtained by coupling the large-scale geodynamic evolution with partitioning of local deformation and stress patterns derived from analyzing the seismicity character, focal plane solutions and kinematics of genetically related active structures. The goal of the present paper is to investigate the stress field characteristics in relation with the specific geotectonics and seismogenic zones of Romania. The principal stress components are computed by inverting the fault plane solutions provided by a completed and updated catalogue for the crustal earthquakes recorded since 1929 up to 2012. Our investigation is justified to the extent that the basic hypothesis of properly representing the seismic area partitioning by individual clusters of events is relevant at the scale of each earthquake-prone area and from statistical point of view (minimum 20–30 events). The catalogue covers mostly the area in front of the Carpathians Arc: Moesian Platform, Barlad Depression, North Dobrogean Orogen, Southern Carpathians belt (Făgăraş-Câmpulung, Central Southern Carpathian and Danubian seismogenic zones) and western part of Romania (Banat region). The seismicity is sporadic and the available fault plane solutions are less representative for the entire area in the inner side of the Carpathians and for the Dobrogea region, located between Danube river and Black Sea. Therefore, for these last two regions the resulted stress field properties are considered as preliminary. The formal stress inversion applied on groups of focal mechanisms proved to be a better estimation of the tectonic stress orientation that can be achieved in the study region in comparison with single focal mechanism, as shown in the World Stress Map Project 2016.

中文翻译：

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罗马尼亚复杂地震活动区的地壳应力分配

分析活动造山环境中应力和变形的分区对于理解驱动地球动力学演化和​​地震活动的机制（特别是在复杂造山环境中）至关重要。在这方面，通过将大规模的地球动力学演化与对局部变形和应力模式的划分结合起来，从而获得了定量的理解，该模式是通过分析与遗传相关的活动结构的地震活动性，焦平面解和运动学得出的。本文的目的是研究与罗马尼亚的特定大地构造和地震发生带有关的应力场特征。通过反转完整的和更新的自1929年至2012年记录的地壳地震的目录提供的断层平面解，可以计算出主要应力分量。从统计的角度来看，事件的集群与每个地震多发地区的规模有关（最少20–30个事件）。该目录主要涵盖喀尔巴阡山脉弧前的区域：莫斯平台，巴拉德凹陷，北多布罗根造山带，喀尔巴阡山脉南部带（Făgăraş-Câmpulung，喀尔巴阡山脉中部南部和达努比亚地震发生带）和罗马尼亚西部（班纳特地区）。地震活动是零星的，并且可用的断层平面解对于喀尔巴阡山脉内侧的整个区域以及位于多瑙河和黑海之间的多布罗加地区的代表性较小。因此，对于最后两个区域，所得的应力场特性被认为是初步的。事实证明，与单一震源机制相比，应用于震源机制组的形式应力反演是对研究区域构造应力方向的更好估计，如2016年世界应力图项目所示。