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. 2017 Jul 10;8:15980. doi: 10.1038/ncomms15980

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Copyright © 2017, The Author(s)

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a) Location of study area in the Lesser Antilles subduction zone. The seismicity from 1900 to 2015 from the ISC catalogue is marked by coloured dots. Ellipses mark the estimated rupture areas of the 1843 and 1839 earthquakes¹⁵. (b) Survey geometry with bathymetry of the study area. Small circles, colour-coded for depth, mark earthquake hypocenters used in this study. Smaller circles mark events that were relocated but were not used in the tomography. Coloured lines mark airgun shooting profiles from different surveys: EW9803 (orange), Sismantilles 1 (black), TRAIL (red), Sismantilles 2 (blue) and SEA-CALIPSO (purple). Triangles mark land stations. Squares mark OBSs. White dashed lines mark the outlines of the Barracuda and Tiburon ridges. Black dashed lines mark the projection onto the plate interface of the approximate prolongation of the main recognized fracture zones. The white box marks the extent of the tomography model. Numbered white lines mark the locations of profiles shown in Fig. 4. Topography and bathymetry data for this image were compiled from multi-beam bathymetry data²¹,⁶⁹, the GEBCO_2014 Grid, version 20150318 (www.gebco.net), and data from the ASTER Global Digital Elevation Model (GDEM) v2 (ref. ⁷⁰).