Analysis of the near-surface structure of the Aller fault system (SAFETY)

阿勒断层系统近地表结构分析（安全）

• 批准号: 535374791
• 负责人: Dr. Christian Brandes
• 金额: --
• 依托单位: Institut für Geologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/535374791?language=en
• 关键词: Analysis; near; surface; structure; Aller

Northern Germany is commonly regarded as an area of low seismicity, but a number of historic earthquakes with intensities of up to VII occurred in this region during the last 1200 years that point to significant seismic events. In the proposed project, we aim for an improved analysis of the Aller fault system, which is one of the major fault systems in northern Germany. The proposed project has two main objectives. The first one is to analyse the near-surface fault structure of the Aller fault system at two selected locations. The second objective is to investigate the sediment thickness distribution in the study area and to investigate whether locally thicker sediment accumulations are driven by fault activity, thus representing small fault-controlled basins in which Eemian sediments are locally preserved. Within the frame of the proposed project, we plan to acquire several shear-wave and P-wave reflection seismic profiles and a grid of GPR profiles at the two locations near Hämelhausen and Lehringen in Lower Saxony. We will investigate how close branches of the Aller fault system reach the Earth’s surface and if the Aller fault system was neotectonically active. The anticipated results will deliver new insights into the near-surface structure of an intraplate fault system in northern Central Europe and will improve knowledge about the timing of neotectonic fault activity, which may support future probabilistic seismic hazard analysis. Furthermore, the project will help to solve the origin of the Eemian depocentres and the formation of important Paleolithic archaeological sites that are related to these mini-basins.

德国北部通常被认为是地震活动较少的地区，但在过去的1200年里，该地区发生了许多强度高达VII级的历史性地震，表明发生了重大地震事件。在拟议的项目中，我们的目标是改进对Aler断层系统的分析，该系统是德国北部的主要断层系统之一。拟议的项目有两个主要目标。第一种方法是在选定的两个地点分析阿勒尔断裂系统的近地表断裂结构。第二个目的是调查研究区的沉积物厚度分布，并探讨局部较厚的沉积物堆积是否受断裂活动的驱动，从而代表局部保存有伊米面沉积物的小型断控盆地。在拟议项目的框架内，我们计划在下萨克森州海梅尔豪森和莱林根附近的两个地点获取几条横波和P波反射地震剖面以及一个探地雷达剖面网格。我们将调查Aler断层系统的分支到达地球表面的距离有多近，以及Aler断层系统是否在新构造上活动。预期的结果将对中欧北部板内断裂系统的近地表结构提供新的见解，并将提高对新构造断裂活动时间的了解，这可能支持未来的概率地震危险分析。此外，该项目将有助于解决与这些小型盆地有关的埃米亚堆积物中心的起源和重要旧石器时代考古遗址的形成问题。