A caldera similar to this one filled with water to become Crater Lake in Oregon (42°56'42"N, 122°06'01"W; see Figure 35-2). Why isn’t the Okmok Caldera presently filled with water?
The question is based on Map T-2, the “Umnak, Alaska,” topographic map (scale 1:250,000; contour interval 200 feet), Map T-21b, a satellite image; and Figures 35-3 and 35-4, a shaded relief map and a stereogram showing the Okmok Caldera (53°25'33"N, 168°07'38"W) on Umnak Island in the Aleutian Islands.
What will be an ideal response?
The Okmok caldera wall is open to the northeast.
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