Surface vertical displacements, potential perturbations andgravity changes of a viscoelastic earth model induced by internal point dislocations

Details Surface vertical displacements, potential perturbations andgravity changes of a viscoelastic earth model induced by internal point dislocations Surface vertical displacements, potential perturbations andgravity changes of a viscoelastic earth model induced by internal point dislocations

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999geoji.137..429w&link_type=abstract

Geophysical Journal International, Volume 137, Issue 2, pp. 429-440.

Astronomy and Astrophysics

Astronomy

10

Deformation, Dislocations, Potential Field, Viscosity

Scientific paper

Using the viscoelastic correspondence principle, we utilize the surface coseismic spheroidal deformation fields (i.e. vertical displacements, potential perturbations and gravity changes) of SNREI earth models caused by four typical types of point dislocation, derived by Sun & Okubo (1993), to deduce the fundamental formulas for spheroidal fields relevant to viscoelastic earth models. In computations, we employ a strike-slip dislocation on a vertical plane buried at the bottom of the lithosphere to estimate the maximal viscous relaxation responses to this kind of source that possibly exist on the surface of the earth. We take the seismic moment as 10^22 N m, which is characteristic of an average large earthquake. The numerical results demonstrate that, if we take the viscosity as 10^19 Pa s in the asthenosphere, and 10^21 Pa s in the other mantle layers, the rates of surface vertical displacements and gravity changes within about 2.5 deg for the 10 postseismic years are respectively 1.5-8.1 cm yr^-1 and 4.0-14.9 mugal yr^-1 : the viscous relaxation for this mantle viscosity profile proceeds much faster than for a constant mantle viscosity of 10^21 Pa s.

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