New Maps/Report by USGS Scientists Show Underwater Features of Crater Lake in Unprecedented Detail Ancient lava flows, volcanic cones and landslides are some of the features below the surface of Crater Lake that are depicted and explained in a report available from the U.S. Geological Survey, Department of the Interior. The geologic features of Crater Lake came to light in July 2000, when U.SGS scientists mapped the floor of the lake in unprecedented detail, using an ocean-exploration technique known as high-resolution multibeam echosounding.

Information about Crater Lake and the new bathymetry survey is available online from the Crater Lake Information Clearinghouse at http://craterlake.wr.usgs.gov and the Pacific Seafloor
Mapping Project at http://walrus.wr.usgs.gov/pacmaps.

• Crater lake Data Clearinghouse