- Seafloor enthusiasts! We now have a complete set of high resolution seafloor bathymetry grids for the Cascadia subduction zone (offshore Washington, Oregon & northern California) available for download! #USGS #data #science #mapping #MarineGeohazards 🧪⚒️🌊 www.usgs.gov/programs/cmh...Apr 23, 2025 23:31