The 150 km long, 6 s TWT, 2D seismic profile KBF03A, which was acquired in 1994 and lies near the western edge of the Kaapvaal craton in South Africa, has been reprocessed using standard reflection seismic processing methods. The results exhibit a significant improvement in the imaging quality of the subsurface features and an evident boost in the signal-to-noise ratio. The improved seismic data, combined with application of seismic attributes, integration with surficial geological and geophysical maps, and computation of velocity tomograms, has revealed previously undetected structural features within the supracrustal sequences underlying the profile. In particular, the Phanerozoic sediments found along the profile, comprising exclusively Kalahari Group and Dwyka Group deposits, are disrupted by multiple folds of varying wavelengths (~1–10 km) and variably oriented normal and thrust faults. Additionally, the effect of the Moshaweng fault, previously characterised as a listric fault extending to depths of >10 km, on the Phanerozoic sediments has been further constrained to suggest repeated extensional reactivations and a more recent (<1 Ma) inversion. Considerations of the eastern end of the profile have suggested links between some of the observed structural features and the nearby ~146 Ma Morokweng impact structure, the lateral expanse of which is poorly constrained in the literature. The collection of these newly imaged features is interpreted as evidence for multiple Late Mesozoic to Cenozoic tectonic events, including polyphasic reactivation of basement structures, under both extensional and compressional stress regimes. By analysing these newly detected features, our study not only provides new insight into the neotectonic evolution of the Phanerozoic sediments along the western margin of the Kaapvaal craton, but also demonstrates the utility in reprocessing legacy data and reveals its untapped potential.

1994年购得的150 km长，6 s TWT，2D地震剖面KBF03A已使用标准反射地震处理方法进行了重新处理，该地震剖面位于南非Kaapvaal克拉通的西边缘附近。结果表明，地下特征的成像质量有了显着改善，信噪比明显提高。改进后的地震数据，结合地震属性的应用，与浅层地质和地球物理图的整合以及速度层析成像的计算，已经揭示了该剖面下地壳层序中以前未被发现的结构特征。特别是沿剖面发现的生代沉积物，仅包括卡拉哈里组和德维卡组沉积物，被不同波长（〜1-10 km）的多重褶皱和定向断裂和正断层的干扰所破坏。此外，莫沙文断裂（以前被表征为延伸至> 10 km深度的李斯特断裂）对生代沉积物的影响进一步受到限制，以表明反复的伸展复活和最近（<1 Ma）的反演。考虑到剖面的东端，建议在一些观察到的结构特征和附近的〜146 Ma Morokweng冲击构造之间建立联系，该构造在文献中很少受到横向扩展的限制。这些新成像的特征的集合被解释为多个晚中生代至新生代构造事件的证据，包括基底结构的多相再活化，在拉伸应力和压缩应力两种情况下。通过分析这些新发现的特征，我们的研究不仅为了解沿Kaapvaal克拉通西缘的生代沉积物的新构造演化提供了新的见解，而且还展示了其在处理遗留数据中的效用，并揭示了其尚未开发的潜力。