Aniakchak Caldera

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  FionaRae (guest)

  http://www.avo.alaska.edu/volcanoes/volcinfo.php?volcname=Aniakchak From Miller and others (1998): "Aniakchak Crater is an ice-free, circular caldera about 10 km in diameter and a maximum of 1 km deep which was first described by Smith (1925). The pre-caldera cone was built upon a basement of Tertiary sedimentary and volcanic rocks and Jurassic-Cretaceous sedimentary rocks, which are exposed high on the east and south walls of the caldera (Detterman and others, 1981). The elevation of the caldera rim varies from 1,341 m to 610 m. Surprise Lake, a 3.2-km-long lake in the northeast part of the caldera at an elevation of about 335 m is the source of the Aniakchak River, which flows through a breach in the eastern wall of the caldera. Numerous domes, flows, and cones occupy the interior of the caldera (Neal and others, 1992); the largest cone is Vent Mountain, 2.5 km in diameter and rising 430 m above the floor of the caldera. The pre-caldera cone was built on the west side of a basement high. The cone was deeply dissected by numerous glaciers that cut U-shaped valleys into the slopes before the caldera-forming eruption.

  17 years ago | reply | hide comment
• 
  Michel rabatel (guest)

  very interesting! I'm a fan of Flight simulator X and i'm also a real pilot in France and I visit the planet, according with web sites giving maps and photos. Aniakchak National Monument is astounding. Our world is fantastic in the universe. Let protect him. Mich

  16 years ago | reply | hide comment