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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/4314

Authors: Casula, G.*
Carcione, J. M.*
Title: Generalized Mechanical Model Analogies of Linear Viscoelastic Behaviour
Title of journal: Bollettino di Geofisica Teorica ed Applicata
Series/Report no.: Vol. XXXIV - N. 136
Issue Date: Dec-1992
Keywords: Rheology
Wave Propagation
viscoelastic Behaviour
Linear standard Models
Abstract: abstract - The description of wave propagation by a viscoelastic rheology allows for the introduction of two important phenomena: wave dissipation, i.e., the conversion of motion into heat, and velocity dispersion, the phenomenon in which two different Fourier components travel with different velocities. In this work, we consider a mechanical representation of viscoleastic media, which in virtue of its simplicity constitues a useful tool to model the variety of dissipation mechanisms present in real media. Examples of simulated wavefields in these type of media can be found, for instance, in the works of Carcione et al. (1988a,b), where the equations are based on the standard linear solid model. Here we analyze in detail the physical properties and capabilities of different mechanical models, and give some hints to obtain realistic models of attenuation and velocity dispersion; for example, the constant Q phenomenon and the set of relaxation peaks over a given frequency band.
Appears in Collections:04.01.05. Rheology
Papers Published / Papers in press

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