Viscosity of the lithosphere of Enceladus

Computer Science

Scientific paper

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Enceladus, Lithosphere, Satellite Surfaces, Terrain Analysis, Viscosity, Voyager 2 Spacecraft, Chemical Composition, Craters, Heat Transmission, Spaceborne Photography, Topography, Saturn, Satellites, Enceladus, Viscosity, Lithosphere, Characteristics, Voyager 2, Images, Surface, Regions, Craters, Observations, Bombardment, Features, Water, Comparisons, Depth, Crater Floors, Relaxation, Ice, Analysis, Time Dependency, Temperature, Composition, Regolith

Scientific paper

Regions of the Enceladus surface are shown by high resolution Voyager II images to be highly cratered, as if by heavy bombardment, with crater forms similar to those of fresh lunar surfaces but often shallower in depth. The flattening of these craters and the bowing up of their floors indicate viscous relaxation of the topography. Viscosity at the top of the lithosphere is suggested by crater form analysis to lie between 10 to the 24th and 10 to the 25th P. The zones where flattened craters occur may be regions of past or present heat flow that is higher than in adjacent terrains. Encedalus probably has a mixture of ammonia ice and water ice in the lithosphere, while the lithospheres of Ganymede and Callisto are primarily composed of water ice

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