Complex Martinique intermediate-depth earthquake reactivates early Atlantic break-up structures

Lindner, Mike, Rietbrock, Andreas, Bie, Lidong ORCID:, Gao, Ya-jian, Goes, Saskia and Frietsch, Michael (2024) Complex Martinique intermediate-depth earthquake reactivates early Atlantic break-up structures. Geophysical Research Letters, 51 (11). ISSN 0094-8276

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Earthquakes that rupture several faults occur frequently within the shallow lithosphere but are rarely observed for intermediate-depth events (70–300 km). On 29 November 2007, the Mw7.4 Martinique earthquake struck the Lesser Antilles Island Arc near the deep end of the Wadati-Benioff-Zone. The sparse regional seismic network of 2007 previously hampered a detailed examination of this unusually complex event. Here, we combine seismic data from different studies with regional moment tensor inversion results and 3D full-waveform modeling. We show that the earthquake is a doublet consisting of dip-slip and strike-slip motion along two oblique structures, both activated under extensional stress along the strike of the slab. Comparison with tectonic reconstructions suggests that the earthquake ruptured along a re-activated ridge-transform segment of the subducted Proto-Caribbean spreading ridge. The unprecedented resolution of the source process highlights the influence of pre-existing structures on localizing slab deformation also at intermediate-depth.

Item Type: Article
Additional Information: Funding information: This work was funded under Natural Environment Research Council Grant NE/K010611/1 and by the Geophysical Institute at KIT.
Faculty \ School: Faculty of Science > School of Environmental Sciences
UEA Research Groups: Faculty of Science > Research Groups > Geosciences
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Depositing User: LivePure Connector
Date Deposited: 12 Jun 2024 09:30
Last Modified: 17 Jun 2024 09:30
DOI: 10.1029/2024GL108922


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