Unexpected seismicity has been detected in the past few years along the northern Guadiana Menor River (Guadalquivir foreland basin) at the northern boundary of the Betic Cordillera. Earthquake focal mechanisms evidence the activity of N‐S to NNE‐SSW sinistral faults in the basement. Yet continuous GPS (CGPS) data show a westward movement in both the Prebetic Arc and the eastern Guadalquivir basin infill, which disagrees with the strike‐slip faults. To more precisely describe the structure and evolution of the area, new Bouguer anomaly data from the southeastern basin combined with seismicity data, electric resistivity tomography profiles (ERT), and surface studies are provided. Given the soft consistency of the sedimentary infill in the area, surface evidence of faulting is scarce, limited to elongated channel and minor vertical faults affecting Quaternary sediments, where ERT profiles suggested the presence of faults. These results suggest that the Guadalquivir basin infill, the Prebetic Arc and the central Betic Cordillera move towards the west, independent from the Iberian crust, but indicating to some extent an upward propagation of the basement deformation. However, the basement is coupled with the Alboran Domain and undergoes NNW‐SSE Eurasia‐Nubia convergence and orthogonal extension. This scenario is suggestive of the initial stages of indentation tectonics, better developed in the eastern Betic Cordillera and the central Alboran Sea.

中文翻译：

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走滑前陆断层（中部比蒂科迪勒拉锋）的地震活动：压痕构造学的证据

在过去的几年中，在Betic Cordillera北部边界的Guadiana Menor河北部（Guadalquivir前陆盆地）发现了意外的地震活动。地震震源机制证明了地下室N‐S到NNE‐SSW左旋断裂的活动。然而，连续的GPS（CGPS）数据显示，在弧前弧带和瓜达基维尔东部盆地的填充物中都向西运动，这与走滑断层不同。为了更准确地描述该地区的结构和演化，提供了东南盆地的新布格异常数据，并结合了地震数据，电阻率层析成像（ERT）和地表研究。考虑到该地区沉积物填充物的软一致性，断层的表面证据很少，仅限于影响第四纪沉积物的细长通道和较小的垂直断层，其中ERT剖面表明存在断层。这些结果表明瓜达尔基维尔盆地填充物，Prebetic Arc和中部Betic Cordillera向西移动，独立于伊比利亚地壳，但在一定程度上表明了基底变形的向上传播。但是，地下室与Alboran区域耦合，并经过NNW-SSE欧亚大陆-努比亚收敛和正交扩展。这种情况表明了压痕构造的初期阶段，该阶段在比蒂科迪勒拉东部和中阿尔伯兰海地区得到了更好的发展。Prebetic Arc和中部Betic Cordillera向西移动，独立于伊比利亚地壳，但在一定程度上表明了基底变形的向上传播。但是，地下室与Alboran区域耦合，并经过NNW-SSE欧亚大陆-努比亚收敛和正交扩展。这种情况表明了压痕构造的初期阶段，该阶段在比蒂科迪勒拉东部和中阿尔伯兰海地区得到了更好的发展。Prebetic Arc和中部Betic Cordillera向西移动，独立于伊比利亚地壳，但在一定程度上表明了基底变形的向上传播。但是，地下室与Alboran区域耦合，并经过NNW-SSE欧亚大陆-努比亚收敛和正交扩展。这种情况表明了压痕构造的初期阶段，该阶段在比蒂科迪勒拉东部和中阿尔伯兰海地区得到了更好的发展。