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geomorphology Western Washington University

Maars

8km (26,247feet)

The largest known maars are found on the Seward Peninsula in Northwest Alaska. These maars range in size from 4000m (13,100ft) to 8000m (26,200ft)in diameter and a depth up to 300m (980ft). There large size is due to the explosive reaction that occurs when magma come in contact with permafrost.Examples of these maars include North Killeak Maar, south Killeak Maar, Devil Mountain Maar and Whitefish Maar.

References: James E. Beget, David M. Hopkins, Steven D. Charron. (1995). “The Largest Known Maars on Earth, Seward Peninsula, Northwest Alaska”. Arctic Vol. 49, No. 1 (March 1996). Pg. 62-69.

Multi-Ring Impact Basins

A multi-ring impact basin is a very large impact crater that initially had a multiple ring morphology. They form when a solid body collides with a planet or moon at a very high speed.

References:

Spudis, Paul D. The Geology of Multi-Ring Impact Basins. Cambridge University Press. 1993