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首页> 外文期刊>NRIAG Journal of Astronomy and Geophysics >Analysis of magnetic gradients at North East of Wadi Ar Rika quadrangle, Saudi Arabia, to delineate subsurface linear features and faults
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Analysis of magnetic gradients at North East of Wadi Ar Rika quadrangle, Saudi Arabia, to delineate subsurface linear features and faults

机译：分析沙特阿拉伯Wadi Ar Rika四边形东北的磁梯度，以描绘地下线性特征和断层

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摘要

Ar Rika fault zone constitutes one of the two major parts of the NW–SE Najd fault system (NFS), which is one of the most prominent structural features located in the east of the center of the Arabian Shield, Saudi Arabia. By using Enhancement Thematic Mapper data (ETM+) and Principle Component Analysis (PCA), surface geological characteristics, distribution of rock types, and the different trends of linear features and faults are determined in the study area. First and second order magnetic gradients of the geomagnetic field at the North East of Wadi Ar Rika have been calculated in the frequency domain to map both surface and subsurface lineaments and faults. Lineaments as deduced from previous studies, suggest an extension of the NFS beneath the cover rocks in the study area. In the present study, integration of magnetic gradients and remote sensing analysis that resulted in different valuable derivative maps confirm the subsurface extension of some of the surface features. The 3D Euler deconvolution, the total gradient, and the tilt angle maps have been utilized to determine accurately the distribution of shear zones, the tectonic implications, and the internal structures of the terranes in the Ar Rika quadrangle in three dimensions.
机译：Ar Rika断裂带是NW-SE Najd断裂系统（NFS）的两个主要部分之一，它是位于沙特阿拉伯阿拉伯盾牌中心以东的最突出的结构特征之一。通过使用增强专题测绘仪数据（ETM +）和主成分分析（PCA），可以确定研究区域的地表地质特征，岩石类型分布以及线性特征和断层的不同趋势。已在频域中计算了Wadi Ar Rika东北部地磁场的一阶和二阶磁场梯度，以绘制地表和地下的线型和断层图。从先前的研究推论得出的线性特征表明，NFS在研究区域的覆盖岩下延伸。在本研究中，磁梯度和遥感分析的整合导致了不同的有价值的导数图，从而确认了某些表面特征的地下扩展。 3D Euler反卷积，总坡度和倾斜角图已被用于在三个维度上准确确定Ar Rika四边形中的剪切带分布，构造影响以及地层的内部结构。

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