Abstract A seismic wave is released when there is sudden displacement on a fault plane. The passage of this wave along the fault plane or within the lithosphere could result in ground shaking or vibration at the surface of the Earth. To provide a geophysical explanation to this phenomenon, the high-resolution aeromagnetic data of the sedimentary terrain and part of the Basement Complex of Southwestern Nigeria were processed and interpreted to provide fault architecture of the area, which could serve as conduit for the passage of seismic energy in the study area. High-resolution aeromagnetic data along the Lagos–Ore axis are processed for fault mapping in the study area. The reduced-to-equator (RTE) residual aeromagnetic data used were enhanced using the total horizontal derivative (THD) and upward continuation (UC) filtering techniques on Oasis Montaj 6.4.2 (HJ) software. The resultant maps were overlaid and compared with the plotted RTE residual maps for relevant interpretations. Varying signatures of magnetic anomalies are grouped into high (57.9–89.1 nT), intermediate (38.2–57.9 nT), and low (4.0–38.2 nT) magnetic intensities, which are associated with contracting basement rocks features. The obtained lineaments from the THD reveal areas of various deformations such as brittle, which is associated with faults/fractures, and ductile deformation, which is associated with folds of geological features. The faults, as depict by the UC map, reveal different depth ranges of 500–2250 m at the western side and 1,500–1,250 m at the northwestern area of the study. Since it has been on record that September 11, 2009, earth tremor of magnitude 4.4, with the epicenter at Allada, Bennin Republic, 128 km west of Lagos, Nigeria occurred within the study area, it can be inferred that the established geologic fault architecture could be responsible for the hazard and be part or synthetic to the Ifewara-Zungeru fault in Nigeria.

中文翻译：

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尼日利亚西南部拉各斯-矿石轴断层结构的航空磁图

摘要 断层面发生突然位移时会释放地震波。该波沿断层面或岩石圈内的通过可能导致地球表面的地面震动或振动。为了对这一现象提供地球物理解释，对尼日利亚西南部沉积地形和部分基底复合体的高分辨率航磁数据进行了处理和解释，以提供该地区的断层结构，可作为地震通过的通道。研究区的能源。沿拉各斯-矿石轴的高分辨率航磁数据被处理用于研究区域的断层绘图。在 Oasis Montaj 6.4.2 (HJ) 软件上使用总水平导数 (THD) 和向上延续 (UC) 滤波技术增强了所使用的缩减至赤道 (RTE) 残余航磁数据。将所得地图叠加并与绘制的 RTE 残差地图进行比较，以进行相关解释。磁异常的不同特征分为高 (57.9–89.1 nT)、中 (38.2–57.9 nT) 和低 (4.0–38.2 nT) 磁强度，这与收缩的基底岩石特征有关。从 THD 获得的线条揭示了各种变形的区域，例如与断层/裂缝相关的脆性和与地质特征褶皱相关的延性变形。UC 地图所描绘的断层揭示了西侧 500-2250 m 和 1,500-1 的不同深度范围，在研究的西北部区域为 250 m。自2009年9月11日有记载的4.4级地震以来，震中位于尼日利亚拉各斯以西128公里的本宁共和国阿拉达，在研究区内发生，可以推断出已建立的地质断层结构可能对危害负责，并且是尼日利亚 Ifewara-Zungeru 断层的一部分或合成部分。