We shed light on the nature and structure of the crust surrounding the Comoros Archipelago, western Indian Ocean, offering insights into the region's geological history and volcanic island formation. Our comprehensive study encompasses the acquisition of new, deeply penetrating seismic data from the SISMAORE cruise (refraction and reflection seismic), and the subsequent analysis of the characteristics and structure of the crust surrounding the Comoros Archipelago. Both the reflection seismic imaging and the velocity structure using ocean bottom seismometers indicate that the crust of the Comoros Basin exhibits oceanic characteristics, thus resolving previous controversies about its nature. The thickness of the oceanic crust ranges from 5.8 to 6.6 km in the north of the archipelago to 6–7.2 km within the Comoros Basin. The estimated roughness of the top basement in the Comoros Basin ranges from 110 to 200 m values typical of intermediate to slow spreading ridges, such as the extinct spreading centre in the West Somali Basin.

中文翻译：

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科摩罗群岛通过继承性断裂带在洋内就位


我们揭示了西印度洋科摩罗群岛周围地壳的性质和结构，深入了解该地区的地质历史和火山岛的形成。我们的综合研究包括从 SISMAORE 巡航中获取新的深穿透地震数据（折射和反射地震），以及随后对科摩罗群岛周围地壳的特征和结构进行分析。反射地震成像和海底地震仪速度结构均表明科摩罗盆地地壳具有海洋特征，从而解决了此前关于其性质的争议。群岛北部的洋壳厚度为 5.8 至 6.6 公里，科摩罗盆地内的洋壳厚度为 6-7.2 公里。科摩罗盆地顶部基底的估计粗糙度范围为 110 至 200 m，是中等至缓慢扩张脊的典型值，例如西索马里盆地的灭绝扩张中心。