Rockslides in the Variscan orogenic belt of the Central Europe are a rare and poorly studied phenomenon. These relatively stable features have recently been shaped by secondary rockfall, toppling, sliding, or slumping. On afforested slopes, such processes can be efficiently analysed and dated by dendrogeomorphic methods. We performed detailed analyses of 355 increment cores from 81 Picea abies (L.) Karst. trees growing on two dormant rockslides in northeastern Czechia to reconstruct the activity of rock block movements and rockfalls. For the event determination we used standard event-response (I_t) index and a semi-quantitative approach involving logical spatial position of disturbed trees during a three-year period. Furthermore, climate preparatory and triggering factors were analysed to investigate possible main drivers of recent secondary processes. Overall, four periods of certain block reactivations at the Prudký site since 1940 and seven periods of certain block reactivations at the Rudohorský site since 1834 were reconstructed. Most of the events can be dated to the period 1960–2000, but our data do not indicate any high-magnitude activity. This paper also demonstrates the results of tree eccentric growth not only in the main supposed direction of stem tilting but also in the direction perpendicular to the main direction when ca. 40% of all trees growing on rock blocks recorded the movements in both analysed axes of stem tilting, suggesting possible complex deformation and different directions of block movements over time. It also appeared that the periods with greatest activity of secondary movements were characterised by a significantly higher rain-on-snow factor (p = 0.007 and 0.026 at the Prudký and the Rudohorský site, respectively) thus indicating block detachments during periods of rapid snowmelt.

中欧华力斯坎造山带的岩石滑坡是一种罕见且研究较少的现象。这些相对稳定的特征最近已由次生落石、倾倒、滑动或坍塌形成。在植树造林的斜坡上，可以通过树木地貌方法有效地分析和确定此类过程。我们对来自 81 Picea abies (L.) Karst的 355 个增量岩心进行了详细分析。在捷克东北部的两个休眠的岩石滑坡上生长的树木，以重建岩石块运动和落石的活动。对于事件确定，我们使用标准事件响应（I _t) 指数和半定量方法，涉及三年期间受干扰树木的逻辑空间位置。此外，还分析了气候准备和触发因素，以调查近期次级过程的可能主要驱动因素。总体而言，重建了自 1940 年以来 Prudký 站点的四个特定区块重新激活时期和自 1834 年以来 Rudohorský 站点的七个特定区块重新激活时期。大多数事件可以追溯到 1960 年至 2000 年期间，但我们的数据并未表明任何高强度活动。本文还展示了树木偏心生长的结果，不仅在茎倾斜的主要假设方向上，而且在与主方向垂直的方向上也有 ca。在岩石块上生长的所有树木中有 40% 记录了两个分析的茎倾斜轴的运动，表明随着时间的推移可能的复杂变形和块运动的不同方向。似乎二次运动活动最活跃的时期的特征是显着更高的雨雪系数（分别在 Prudký 和 Rudohorský 场地 p = 0.007 和 0.026），因此表明在快速融雪期间块分离。