Novarupta lava dome, Mt. Katmai, and Trident Volcano, Alaska. The dome is 380 meters in diameter and occupies a small part of the vent from which about 15 cubic kilometers of magma was erupted in 1912 (dashed line marks approximate outline of vent). (Copyrighted photograph reprinted with permission, Aero Map US Inc., August 21, 1987.)

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Updated 06.24.97