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lava coil
A lava coil is a spiral or scroll-shaped lava formation occurring when relatively low viscosity lava such as Pahoehoe solidifies along a slow-moving shear zone in the flow. The shear produces a Kelvin–Helmholtz instability that forms spiral-shaped patterns. Depending on the side of the flow the spiral is clockwise or anti-clockwise. They have been observed on flows near Kilauea on Hawai'i,〔(Dallas Peck, Lava coils of some recent historic flows, Hawaii. Geological Survey Research, B148-B151 1966 )〕 in Kenya〔Temperley BN (1966) Vortex exudation coils on a recent basaltic lava in Kenya. Overseas Geol Mineral. Resour. 10:42--46〕 and possibly on Mars.
File:lava coil.png| Surface of December 31, 1974 pahoehoe northeast of Pu‘u Koa ́e, Hawaii. Lava coil is 10 m diameter.
File:Weird-Lava-flows-on-Mars.jpg|Spirals interpreted to be lava coils〔 on the surface of a Martian lava lake in Cerberus Palus. Field of view is about 500 m.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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