Combined topography and bathymetry hillshade for Davidof volcano. The mostly submerged caldera is approximately 2.5 km diameter, and has a maximum depth of 80 m. Bathymetry from Alaska Fisheries Science Center (https://www.fisheries.noaa.gov/inport/item/22164) and subaerial elevations from the U.S. Geological Survey IFSAR survey (accessed from https://elevation.alaska.gov/).
Image courtesy of AVO/USGS.