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Recent Reactivation of Variscan Tectonic Zones: A Case of Rodl-Kaplice-Blanice Fault System (Bohemian Massif, Austria/Czech Republic)
Surveys in Geophysics ( IF 4.9 ) Pub Date : 2024-02-22 , DOI: 10.1007/s10712-023-09811-x
Pavel Roštínský , Lubomil Pospíšil , Otakar Švábenský , Anastasiia Melnyk , Eva Nováková

The Rodl-Kaplice-Blanice fault system (RKB) of Variscan shear origin, repeatedly active since the Late Paleozoic to the Recent, is expressed by a number of lithological contacts, distinct geophysical gradients and many landforms. A general trend of the RKB as well as linear configuration of its internal architecture is fairly similar to those of topical near Rhine Graben and Alpine-Carpathian transition area as the two other consistent recently reactivated large-scale tectonic structures in the extended (thinned) crust of central Europe. In middle part of the RKB, the occurring linear topographic and geological features parallel to the main RKB sections point to the existence of a wide tectonic zone in the crust following the fault system. Our multidisciplinary study includes a summary of corresponding basic geological data, overview of seismic, regional geophysical and geomorphological conditions, primary model of recent kinematic activity in the RKB area derived from the space (Global Navigation Satellite System—GNSS) monitoring and terrestrial (repeated high precision levelling) geodetic data and comparison of these various information.

The obtained knowledge indicates that the RKB is active up to ~ 1.0 mm horizontally and > 0.5 mm vertically. The fault system area in the Bohemian Massif can be subdivided into the three parts of diverse tectonic structure and block kinematics. Sinistral horizontal movements are highest near the southern surface sections (Rodl-Kaplice, Rudolfov and Drahotěšice faults), whereas noticeable vertical differentiation is going on mainly along the Blanice and Kouřim faults in the north where the RKB activity is gradually decreasing towards the extensive Elbe shear zone with transverse movements. The middle part of the RKB is dislocated by a large active transverse tectonic structure of the South Bohemian Basins (SBB) with variable horizontal velocity vectors of surface GNSS stations. Most of the weak regional earthquakes have been recorded west of the RKB. Besides faults of the SBB, these were mainly associated with the RKB-subparallel Lhenice fault. Based on the earthquake distribution and foci depths, the latter fault can have similar structural position as the RKB related to lower part of the Variscan level in the ~ 10–12 km depth.



中文翻译:

瓦里斯构造带的近期重新激活:以 Rodl-Kaplice-Blanice 断层系统为例(奥地利/捷克共和国波希米亚地块)

瓦里斯坎剪切起源的罗德尔-卡普利采-布兰尼斯断层系(RKB)自晚古生代到近代以来反复活动,表现为许多岩性接触面、明显的地球物理梯度和许多地貌。 RKB 的总体趋势及其内部结构的线性配置与莱茵河地堑和阿尔卑斯-喀尔巴阡过渡区附近的局部非常相似,因为扩展(减薄)地壳中另外两个最近重新激活的一致的大型构造结构中欧的。在RKB中部,出现与RKB主要剖面平行的线性地形和地质特征,表明地壳中存在沿着断层系的宽阔构造带。我们的多学科研究包括相应基础地质数据的总结、地震概述、区域地球物理和地貌条件、基于空间(全球导航卫星系统 - GNSS)监测和地面(重复高精密水准测量)大地测量数据以及这些各种信息的比较。

获得的知识表明 RKB 的水平活动范围可达 ~ 1.0 mm,垂直范围可达 > 0.5 mm。波希米亚地块断层系统区可细分为不同构造结构和块体运动学的三个部分。左旋水平运动在南部地表部分(Rodl-Kaplice、Rudolfov 和 Drahotěšice 断层)附近最高,而明显的垂直分异主要沿着北部的 Blaice 和 Kouřim 断层进行,其中 RKB 活动逐渐减弱,朝向广泛的易北河剪切具有横向运动的区域。 RKB 的中部由于南波希米亚盆地 (SBB) 的大型活动横向构造结构而发生错位,其表面 GNSS 站的水平速度矢量可变。大多数弱区域地震发生在 RKB 以西。除了 SBB 断层外,这些断层主要与 RKB 近平行 Lhenice 断层有关。根据地震分布和震源深度,后一个断层可能具有与约 10-12 km 深度的 Variscan 水平下部相关的 RKB 相似的构造位置。

更新日期:2024-02-22
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