SUMMARY We determine a new 3-D shear wave velocity (Vs) model down to 400 km depth beneath the Cape Verde hotspot that is far from plate boundaries. This Vs model is obtained by using a new method of jointly inverting P- and S-wave receiver functions, Rayleigh-wave phase-velocity data and S-wave arrival times of teleseismic events. Two Vs discontinuities at ∼15 and ∼60 km depths are revealed beneath volcanic islands, which are interpreted as the Moho discontinuity and the Gutenberg (G) discontinuity. Between the north and south islands, obvious high-Vs anomalies exist in the uppermost mantle down to a depth of ∼100–150 km beneath the Atlantic Ocean, whereas obvious low-Vs anomalies exist in the uppermost mantle beneath the volcanic islands including the active Fogo volcano. These low-Vs anomalies merge into a significant column-like low-Vs zone at depths of ∼150–400 km beneath the Cape Verde swell. We propose that these features in the upper mantle reflect a plume-modified oceanic lithosphere–asthenosphere system beneath the Cape Verde hotspot.

中文翻译：

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佛得角下方羽流改变的海洋岩石圈-软流圈系统的地震证据

总结 我们确定了一个新的 3-D 横波速度 (Vs) 模型，该模型可深入佛得角热点下方 400 公里，远离板块边界。该 Vs 模型是通过联合反演 P 波和 S 波接收函数、瑞利波相速度数据和远震事件的 S 波到达时间的新方法获得的。在火山岛下方揭示了约 15 公里和约 60 公里深度的两个 Vs 不连续面，这被解释为莫霍面不连续面和古腾堡 (G) 不连续面。南北岛之间，大西洋下~100~150 km深度的上地幔中存在明显的高Vs异常，而火山岛下的上地幔中存在明显的低Vs异常，包括活跃福戈火山。这些低 Vs 异常在佛得角隆隆下方约 150-400 公里处合并成一个显着的柱状低 Vs 区。我们提出，上地幔中的这些特征反映了佛得角热点下方的羽状改变的海洋岩石圈-软流圈系统。