The underwater landscape of Crater Lake was mapped in 2000. this collection imagery and data was a cooperative effort between the U.S. Geological Survey's Pacific Seafloor Mapping Project, the National Park Service, and the Center for Coastal and Ocean Mapping at the University of New Hampshire. A state-of-the-art multibeam sonar system collected high-resolution bathymetry, and calibrated co-registered acoustic backscatter to support both biological and geological research in the area (aquatic biology, geochemistry, volcanic processes, etc). This survey collected over 16 million soundings and the resulting data portrays the bottom of Crater Lake at a spatial resolution of 2 meters.
The cinder volcano named Wizard Island grew as the lake filled. Older submerged shorelines of the island can be seen where lava flows shattered after entering the lake, creating steep underwater talus slopes. The gently sloping bench around Wizard Island consists of lava flows that were later drowned by the rising lake. Submerged near the center of Crater Lake is the central platform volcano, which also has breaks in its slopes that indicate the location of shorelines. Below its steep north and east flanks, however, are sinuous lava flows that apparently flowed underwater, down over the shattered older lava.
The above information is copied from the USGS website. Additional photos and explanations of underwater formations as seen through the Crater Lake bathymetry study can be found on the USGS website.
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"Fly-by of shaded-relief bathymetry and surrounding mountains of Crater Lake Oregon. The colored region is the lake floor whereas the gray region shows the surrounding mountains. The lake is approximately 9-km wide east to west. The flight approaches from the south, flies around the lake floor in a clockwise direction, passes over Wizard Island, Merriam Cone, the deep East Basin, the Central Platform, and Rhyodacite Dome." From pubs.usgs.gov/dds/dds-72/site/flyby.htm
Last updated: September 24, 2021