Fig. 1: Maps of the research area.
From: Fluids from deep subducted sediments control the seismic behavior of the Lesser Antilles megathrust
a Bathymetric map, tectonic setting and seismic survey of the study area in the northern-central Lesser Antilles. The Tiburon and Barracuda ridges subduct obliquely beneath the forearc shown by white dashed lines. The red line indicates the multi-channel seismic profile. The blue line indicates the profile perpendicular to the Tiburon ridge outboard of the trench20. The blue point shows the location of the estimate for the thickness of the incoming sediment21. All earthquakes shown are > 4 between the years 2014 and 2019, location data from the Institut de Physique du Globe de Paris (IPGP) Data Center, and available focal mechanisms from the Global Centroid Moment Tensor (Global CMT) catalog. Red stars large events 1839, 1946, and 1953. Ellipses the estimated rupture from large historic megathrust events in 1843 and 1839. b Bathymetric map superposed by the Vp structure of the slab modified from ref. 39, Vp >7.5 km/s in red, Vp <7.5 km/s in green. Relocated hypocenters from the OBSAntilles survey (survey area outlined by thin white line)62 are marked by purple dots, red dots indicating events in the overriding plate. Yellow segments of the MCS profile indicate the sediments in the plate boundary revealed in this study. Area with yellow dashed lines indicates the inferred underthrust sediments in front of the Tiburon ridge in this study. M. basin Martinique basin, K. graben Kalanina graben.
