Abstract. The region around the town Albstadt, SW Germany, was struck by four damaging earthquakes with magnitudes greater than five during the last century. Those earthquakes occurred along the Albstadt Shear Zone (ASZ) which is characterized by more or less continuous microseismicity. As there are no surface ruptures visible which may be connected to the fault zone, its characteristics can only be studied by its seismicity. We use the earthquake data of the state earthquake service of Baden-Württemberg from 2011 to 2018 and complement it with additional phase picks beginning 2016 at the AlpArray and StressTransfer seismic networks in the vicinity of the ASZ. This extended dataset is used to determine new minimum 1-D seismic vp and vs velocity models and corresponding station delay times for earthquake relocation. Fault plane solutions are determined for selected events and the direction of the maximum horizontal stress is derived. The minimum 1-D seismic velocity models have a simple and stable layering with increasing velocity with depth in the upper crust. The corresponding station delay times can be well explained by the lateral depth variation of the crystalline basement. The relocated events align north-south with most of the seismic activity between the towns of Tübingen and Albstadt east of the 9° E meridian. The events can be separated into several subclusters which indicate a segmentation of the ASZ. The majority of the 36 determined fault plane solutions features a NNE-SSW strike, but also NNW-SSE striking fault planes are observed. The main fault plane associated with the ASZ is dipping steeply and the rake indicates mainly sinistral strike-slip, but we also find minor components of normal and reverse faulting. The determined direction of the maximum horizontal stress of 147° is in good agreement with prior studies. This result indicates that the stress field in the area of the ASZ is mainly generated by the regional plate driving forces as well as the Alpine topography.

中文翻译：

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高山前陆北部的阿尔布施塔特剪切带的地震活动和构造构造

摘要。上个世纪以来，德国西南部阿尔布施塔特（Albstadt）周围地区遭受了四次破坏性地震的袭击，震级大于五级。这些地震发生在阿尔伯施塔特剪切带（ASZ）上，其特征是或多或少的连续微地震。由于没有可见的可能与断层带相连的表面破裂，因此只能通过其地震活动性研究其特征。我们使用了2011年至2018年巴登-符腾堡州地震服务局的地震数据，并在2016年开始在ASZ附近的AlpArray和StressTransfer地震网络中进行了额外的相位采集。此扩展的数据集用于确定新的最小一维地震vp和vs速度模型以及地震重新定位的相应站点延迟时间。确定所选事件的断层平面解，并得出最大水平应力的方向。最小一维地震速度模型具有简单而稳定的分层，其速度随上地壳中深度的增加而增加。相应的站延迟时间可以通过晶体基底的横向深度变化很好地解释。重新定位的事件使南北与9°E子午线以东的蒂宾根镇和阿尔布施塔特镇之间的大部分地震活动保持一致。事件可以分为几个子类，这些子类指示ASZ的分段。在确定的36个断层平面解中，大多数具有NNE-SSW走向，但也观察到NNW-SSE打击断层。与ASZ相关的主要断层平面陡倾，前角主要表示左旋走滑，但我们也发现了正向和反向断层的较小部分。确定的最大水平应力147°的方向与先前的研究非常吻合。该结果表明，ASZ区域的应力场主要由区域板块驱动力以及高山地形产生。