Displacement, strain and stress fields due to shear and tensile dislocations in a viscoelastic half-space

Details Displacement, strain and stress fields due to shear and tensile dislocations in a viscoelastic half-space Displacement, strain and stress fields due to shear and tensile dislocations in a viscoelastic half-space

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007geoji.170.1399p&link_type=abstract

Geophysical Journal International, Volume 170, Issue 2, pp. 1399-1417.

Astronomy and Astrophysics

Astronomy

3

Deformation, Dislocation, Lithosphere, Rheology, Stress Distribution, Viscoelasticity

Scientific paper

Okada (1992) provided expressions for the displacement and strain fields due to a finite rectangular source in an elastic, homogeneous and isotropic half-space. Starting with these results, we applied the correspondence principle of linear viscoelasticity to derive the quasi-static displacement, strain and stress fields in a viscoelastic, homogeneous and isotropic half-space. We assume that the medium deforms viscoelastically with respect to both the shear and the normal stresses but keeps a constant bulk modulus; in particular, the shear modulus relaxes as Maxwell fluid. We presented the viscoelastic effect on displacement, displacement gradient and stress fields, for a choice of parameter values. The viscoelastic effect due to the sudden dislocation reaches a limit value after about 10 times the Maxwell time. The expressions obtained here provide tools for the study of viscoelastic relaxation of lithosphere associated with seismic and volcanic phenomena.

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