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 Chaski Bay, Crater Lake, Oregon

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[Chaski Bay image]

Oblique view looking east towards Chaski Bay. The distance across the bottom of the image is about 2.6 kilometers (1.6 miles).

A major lake floor feature in this view is the extensive landslide deposit that originated in the caldera wall at Chaski Bay. Characterized by irregular topography and isolated blocks, the Chaski Bay slide separates the southwest basin from the east basin. At the western margin of the slide (A) is an area in which warm water vents into the lake. This area is marked by bacterial mats that were discovered by scientists aboard the Deep Rover. Remnants of the failed caldera wall that fed the Chaski Bay slide can be seen in the form of large down-dropped blocks up to 200 meters (656 feet) in length. Other landslide deposits are found west of Eagle Point, in Danger Bay, and in the east basin.

As in other views of the caldera walls, steep rock outcrops are submerged below promontories above the surface of the lake. Between these promontories are Kerr Notch and Sun Notch, which mark the location of prominent U-shaped valleys that were carved into Mount Mazama by glaciers before the formation of the caldera. In the foreground, prominent channels can be seen on the surface of the central platform. These carried lava flows that cascaded over the platform`s east slope to form a field of lava spreading from its east base.

Source: Gardner, James V., Peter Dartnell, Laurent Hellequin, Charles R. Bacon, Larry A. Mayer, and J. Christopher Stone. 2001. Bathymetry and selected perspective views of Crater Lake, Oregon. USGS Water Resources Investigations Report 01-4046.

March, 2001