ESSE 1010 Lecture Notes - Seismic Wave, Toothpaste, Lithosphere

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Physical basis of plate techtonics: the upper and lower mantle are viscous solids, the lithosphere is a brittle solid, distinction between viscous and brittle behavior is fundamental to understanding. Solids: maintain their form (rigid, hard), no relative displacement of internal particles. Relative displacements of internal particles indicate the internal flow properties or. Rheological classification: basis of classification: net response to short term forces. Viscoelasticity: most materials have: long time scale, an elastic rheology on a short term scale, and a viscous rheology on a. E. g. spring with weight is elastic on time scale of a few seconds or minute, but slowly stretches on a time scale of several years. Short and long are relative terms: forces acting for the same duration may be short for one material but long for another material with different physical properties, since most materials have different physical properties at different temperatures.

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