Abstract. With the aim of unveiling evidence of Late Quaternary faulting, a series of Ground Penetrating Radar (GPR) profiles were acquired across the Campotenese continental basin (Mt. Pollino region) in the southern Apennines active extensional belt (Italy). A set of forty-nine 300 MHz and 500 MHz GPR profiles, traced nearly perpendicular to a buried normal fault, were acquired and carefully processed through a customized workflow. The data interpretation allowed us to reconstruct a pseudo-3D model depicting the boundary between the Mesozoic bedrock and the sedimentary fill of the basin, which were in close proximity to the fault. Once reviewing and defining the GPR signature of faulting, we highlight in our data how near surface alluvial and colluvial sediments appear to be dislocated by a set of conjugate (west and east-dipping) discontinuities that penetrate inside the underlying Triassic dolostones. Close to the contact between the continental deposits and the bedrock, some buried scarps which offset wedge-shaped deposits are interpreted as coseismic ruptures, subsequently sealed by later deposits. Although the use of pseudo-3D GPR data implies more complexity linking the geophysical features among the radar images, we have reconstructed a reliable subsurface fault pattern, discriminating master faults and a series of secondary splays. We believe our contribution provides an improvement in the characterization of active faults in the study area which falls within the Pollino seismic gap and is considered potentially prone to severe surface faulting. Our aim is for our approach and workflow to be of inspiration for further studies in the region as well as for similar high seismic hazard areas characterized by scarcity of near-surface data.

中文翻译：

---

第四纪断层的 GPR 特征：来自 Mt. 的研究。意大利亚平宁山脉南部波利诺地区

摘要。为了揭示晚第四纪断层的证据，在亚平宁山脉活动伸展带南部（意大利）的坎波特斯大陆盆地（Mt. Pollino 地区）采集了一系列探地雷达 (GPR) 剖面。通过定制的工作流程获取并仔细处理了一组 49 个 300 MHz 和 500 MHz GPR 剖面，这些剖面几乎垂直于埋藏的正常断层追踪。数据解释使我们能够重建一个伪 3D 模型，该模型描绘了中生代基岩和盆地沉积填充物之间的边界，它们与断层非常接近。一旦检查和定义了故障的 GPR 签名，我们在数据中强调了近地表冲积和崩积沉积物似乎被一组渗透到下伏三叠纪白云岩内部的共轭（西倾和东倾）不连续性错位。靠近大陆沉积物和基岩之间的接触处，一些抵消楔形沉积物的掩埋陡坡被解释为同震破裂，随后被后来的沉积物封闭。尽管使用伪 3D GPR 数据意味着将雷达图像之间的地球物理特征联系起来更加复杂，但我们重建了一个可靠的地下断层模式，区分了主断层和一系列二次张开。我们相信，我们的贡献改进了研究区内活动断层的特征，该断层位于 Pollino 地震间隙内，被认为可能容易发生严重的地表断层。我们的目标是让我们的方法和工作流程为该地区的进一步研究以及类似的以近地表数据稀缺为特征的高地震危险区提供灵感。