Rheology, Planetary Interior
Rheology (from the Greek words ῥɛĩ (rhei), “to flow,” and λόγος (logos), “teaching”) is the science of the flow and the deformation of matter in response to an applied stress.
Planetary interiors and surfaces are composed of solid and liquid silicate rocks, metals, and ices, which deform and flow under an applied non-hydrostatic stress σ (in [Pa]). If the applied stress is small, the material behaves elastically. This means that the material returns to its initial state after the stress is removed. Real planetary materials exhibit a plastic, nonreversible rheological component, in addition to their elastic behavior. In this case, the material does not fully return to its initial state after the stress is removed.
Plastic rheologies are characterized by a maximum stress, called yielding stress, above which perfect elasticity is lost. For nonelastic rheologies the relative deformation, called strain ɛ (dimensionless) and caused by a constant stress σ0, is time...
KeywordsMantle convection Planetary interior dynamics Plate tectonics Rock creep (diffusion dislocation) Viscosity Tectonics
References and Further Reading
- Jaeger JC, Cook NGW, Zimmermann RW (2007) Fundamentals of rock mechanics, 4th edn. Blackwell, OxfordGoogle Scholar
- Ranalli G (1995) Rheology of the Earth. Chapman and Hall, LondonGoogle Scholar
- Stamenković V et al (2012) The influence of pressure-dependent viscosity on the thermal evolution of super-Earths. Astrophys J 748:22 ppGoogle Scholar
- Watts AB (2001) Isostasy and flexure of the lithosphere. Cambridge University Press, CambridgeGoogle Scholar