Rodrigues Ridge connects the Réunion hotspot track with the Central Indian Ridge (CIR) and has been suggested to represent the surface expression of a sub-lithospheric flow channel. From global earthquake catalogues, the seismicity in the region has been associated mainly with events related to the fracture zones at the CIR. However, some segments of the CIR appear void of seismic events. Here, we report on the seismicity recorded at a temporary array of 10 seismic stations operating on Rodrigues Island from September 2014 to June 2016. The array analysis was performed in the time domain by time shifting and stacking the complete waveforms. Event distances were estimated based on a 1-D velocity model and the travel time differences between S and P wave arrivals. We detected and located 63 new events that were not reported by the global networks. Most of the events (51) are located off the CIR and can be classified as intraplate earthquakes. Local magnitudes varied between 1.6 and 3.7. Four seismic clusters were observed that occurred to the west of the spreading segment of the CIR. The Rodrigues Ridge appeared to be aseismic during the period of operation. The lack of seismic activity along both Rodrigues Ridge and the sections of the CIR to the east of Rodrigues may be explained by partially molten upper-mantle material, possibly in relation to the proposed material flow between the Réunion plume and the CIR.

中文翻译：

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基于时域阵列分析的罗德里格斯山脊（印度洋）周围的地震间隙和板内地震活动

罗德里格斯山脊将留尼汪岛热点轨道与中印度洋山脊（CIR）连接起来，并已被建议代表岩石圈以下流动通道的表面表达。从全球地震目录来看，该地区的地震活动主要与与CIR断裂带有关的事件有关。但是，CIR的某些部分似乎没有地震事件。在这里，我们报告了2014年9月至2016年6月在罗德里格斯岛上运行的10个地震台站的临时阵列记录的地震活动。通过时移和叠加完整波形在时域中进行了阵列分析。事件距离是根据一维速度模型以及S和 P之间的旅行时间差估算的 波到达。我们检测到并定位了全球网络未报告的63个新事件。大多数事件（51）位于CIR附近，可以归类为板内地震。局部大小在1.6到3.7之间变化。在CIR扩展段以西发现了四个地震群。罗德里格斯山脊在手术期间似乎是抗震的。沿罗德里格斯山脊和罗德里格斯以东的CIR断面都缺乏地震活动，这可能是由于上地幔部分熔融的缘故所致，这可能与Réunion羽流和CIR之间的拟议物质流动有关。