摘要
•The southern Puerto Rico slope studied with new swath bathymetry and seismic data.•The Muertos thrust belt is narrow and probably inactive south of St. Croix rise.•The Investigator fault zone shows active dip-slip motion, but no strike-slip motion.•New observations for future assessment of the natural resources offshore Puerto Rico.•New observations for future assessment of the seismic-tsunami hazard in Puerto Rico.