Combined interpretation of 2D reflection seismic data and 2D gravity modelling reveals an Iberian-type magma-poor margin across the Obbia Basin in offshore central Somalia. The configuration of the syn-rift and post-rift sediments as well as the upper crust, the lower crust and the Moho delineates four distinct marginal domains. The proximal domain is characterized by thickest crust and narrow underfilled basins, bounded by normal faults piercing the low-reflective upper crust. On top of the upper crust, there is a thick package of Karoo-aged pre-rift sediments (>2 s two-way time (TWT)). A major normal fault, with a throw of 4 s (TWT) dissects the sediments, the crystalline crust and likely also the Moho and represents the necking point, the oceanward limit of the proximal domain and the transition to the necking domain. The necking domain hosts deep half-grabens filled with wedge-shaped syn-rift sediments of likely Early Jurassic age. Crustal thinning was predominantly accommodated by ductile extension of the high-reflective lower crust, resulting locally in lower crustal boudins. With ongoing extension, the upper crust may have become completely detached from the lower crust and rests on the upper mantle at present-day. Within the subsequent hyperextended domain, the Moho shallows significantly and reaches the top basement level in the seaward portion of the line. Normal faults commonly penetrate through the entire crust and bound minor isolated syn-rift deposits. The termination of the hyperextended domain is marked by a major, shallow-dipping, concave downward fault that apparently connects the Moho with the top basement further seaward. Several small continental blocks, so-called extensional allochthones may be present in the transitional area between the coupling point and the exhumation point. The absence of Moho reflections in the east of the profile indicates that crust may be absent and the upper mantle is exhumed.

对2D反射地震数据和2D重力建模的综合解释显示，索马里中部近海Obbia盆地的伊比利亚型岩浆贫乏边缘。syn的配置裂谷和裂谷后的沉积物，以及上地壳，下地壳和莫霍面划定了四个不同的边缘区域。近端区域的特征是最厚的地壳和狭窄的欠充填盆地，其边界是贯穿低反射性上地壳的正常断层。在上地壳的顶部，有一叠厚厚的卡鲁老化的裂谷前沉积物（> 2 s双向时间（TWT））。一次大的正断层（TWT）经过4 s（TWT）分解，析出了沉积物，晶体壳以及可能的莫霍面（Moho），代表了颈点，近端区域的向海界限和向颈区域的过渡。颈缩区域容纳深楔形的深粉，充满楔形突触可能是侏罗纪早期的裂谷沉积物。地壳变薄主要是由于高反射性下地壳的延展性所致，局部导致了地壳下部的地壳。随着不断的扩展，目前的上地壳可能已经与下地壳完全分离，并搁在上地幔上。在随后的超扩展区域内，Moho明显变浅，并到达该线向海部分的最高地下层。正断层通常穿透整个地壳，并约束较小的孤立同理裂口沉积物。超伸展区域的终止以一个主要的浅倾凹向下断层为标志，该断层显然将莫霍峰与顶部基底进一步向海连接。在耦合点和掘尸点之间的过渡区域中可能存在几个小的大陆块，即所谓的伸展异位甲硫醚。剖面东部没有Moho反射，表明可能没有地壳，并且上地幔被挖出。