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https://doi.org/10.5194/se-2020-56
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2020-56
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  27 Apr 2020

27 Apr 2020

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This preprint is currently under review for the journal SE.

Seismic gaps and intraplate seismicity around Rodrigues Ridge (Indian Ocean) from time-domain array analysis

Manvendra Singh1,2 and Georg Rümpker2 Manvendra Singh and Georg Rümpker
  • 1Mauritius Oceanography Institute, Avenue des Anchois, Morcellement de Chazal, Albion, Mauritius
  • 2Institute of Geosciences, Goethe-University Frankfurt, Frankfurt am Main, Germany

Abstract. Rodrigues Ridge connects the Reunion 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 ten 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 of the complete waveforms. Event distances were estimated based on a 1-D velocity model and the travel-time differences between S- and P-waves arrivals. We detected and located 63 new events, which 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 1.3 and 3.5. Four seismic clusters were observed along with a distinguishable swarm of earthquakes that occurred to the west of the spreading segment of the CIR during the period from March to April 2015. The Rodrigues Ridge appeared 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 Reunion plume and the CIR.

Manvendra Singh and Georg Rümpker

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Manvendra Singh and Georg Rümpker

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Latest update: 23 Oct 2020
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Short summary
Using the seismic array methods 63 events were located in the Rodrigues-CIR region, not reported by any global network, most of them being off the ridge axis. The lack of seismicity along the section of CIR, as observed from global data and this study, can possibly be attributed to the presence of partially molten mantle beneath Rodrigues Ridge. The results will be of interest for a broad range of geoscientists interested in the tectonic evolution of Indian Ocean, and plume-crust interaction.
Using the seismic array methods 63 events were located in the Rodrigues-CIR region, not reported...
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