Schematic representation of the Maxwell viscoelastic model and the Andrade anelastic model. The different models can be seen as a succession of springs (labeled as μ) and dashpots (labeled as η). The springsrepresent the elastic properties of the material while the dashpots represent its viscous properties. The Andrade model is a combination of the viscoelastic Maxwell assembly in series with an infinite number of springs and dashpots in parallel. This last part represents the memory of the material, which corresponds to the anelastic component of the assembly.