Variation in Upper Plate Crustal and Lithospheric Mantle Structure in the Greater and Lesser Antilles From Ambient Noise Tomography

The crust and upper mantle structure of the Greater Lesser Antilles Arc provides insights into key subduction zone processes in a unique region slow convergence old slow-spreading oceanic lithosphere. We use ambient noise tomography gathered from island broadband seismic stations temporary ocean bottom seismometer network installed as part Volatile Recycling experiment to map crustal shear-wave velocity eastern Arc. Taking depth 2.0 km/s contour proxy, we find sediment thickness up 15 km south Grenada Tobago basins thinner sediments near arc north. observe thicker crust, based on 4.0 contour, beneath platforms with greatest around 30 km, likely related addition volcanism through time. There are distinct low zones (4.2–4.4 km/s) wedge (30–50 depth), Mona Passage, Guadeloupe-Martinique, Grenadines. passage anomaly may be ongoing extension there, while Guadeloupe-Martinique Grenadine anomalies fluid flux, upwelling, and/or partial melt nearby slab features. location is slightly obliquely subducted fracture zones. This feature could explained by either three-dimensional flow, gap slab, variable hydration, dynamics including ponding interactions plate.