Starting in May 2018, a volcano-tectonic crisis occurred in the vicinity of Mayotte, a volcanic island in the Comoros Archipelago in the Mozambique Channel. The origin of the volcanism but also the subsurface architecture and nature of the crust, remain unknown. Here, based on receiver function analyses that provide S-wave velocity profiles, we determine the depth of Mohorovičić discontinuity (Moho) and V_P/V_S ratios for volcanic islands in the Mozambique Channel. We propose that the crust beneath Mayotte and Juan de Nova islands is of continental nature, while it appears to be of oceanic origin beneath Europa and Grande Glorieuse islands. Our results suggest that Mayotte edifice grew on an isolated continental block abandoned during the Gondwana breakup and the opening of the Mozambique Channel. The continental crust is underlain by a thick (9–10 km) and fast layer, interpreted as magmatic underplating which may result from the 20-Myr-long duration of the volcanism. The new velocity model determined from the seismic station on Mayotte can be used to relocate the seismicity related to the ongoing volcano-tectonic crisis.

2018年5月开始，莫桑比克海峡科摩罗群岛火山岛马约特岛附近发生火山构造危机。火山活动的起源以及地壳的地下结构和性质仍然未知。在这里，基于提供S波速度剖面的接收器函数分析，我们确定了莫霍罗维奇奇不连续性 ( Moho )的深度和莫桑比克海峡火山岛的V _P /V _S比率。我们认为马约特岛和胡安德诺瓦岛下方的地壳是大陆性的，而它似乎是欧罗巴下方的海洋起源和 Grande Glorieuse 岛。我们的研究结果表明，马约特岛大厦生长在一个孤立的大陆块上，在冈瓦纳大陆分裂和莫桑比克海峡开放期间被遗弃。的大陆地壳由粗（9-10公里）和快速层，解释为岩浆侵这可能导致从火山20秘耳长持续时间伏。从马约特岛地震台确定的新速度模型可用于重新定位与正在进行的火山构造危机相关的地震活动。