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Crater Ridge (top) and Mt. Edgecumbe
(bottom) Volcanic Field
Credit & Copyright: Dr. Bruce G.
Explanation: Few Americans likely realize that there are spectacular volcanic landscapes in coastal southeast Alaska. Here is the amazing volcanic field of Crater Ridge and dormant Mt. Edgecumbe on Kruzof Island, west of the town of Sitka and south of Juneau.
Edgecumbe Volcanic Field resulted from prehistoric
eruptions that were last only slightly reawakened with two minor tephra-forming
eructations some four and six thousand years ago, following a larger blast
nearly ten thousand years ago.
The ecological implications of volcanoes and volcanic landscapes in southeast Alaska are wide-ranging.
They have produced fertile soils in which grow dense, true temperate rainforests of cedar and hemlock.
They have created topographic relief (view topography map of the region) -- mountains, ridges, cliffs -- on which ice fields and glaciers have formed and carved out valleys rich with habitats for much wildlife.
Next week's picture: Boy Meets Sea Lion
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