Effects of earth's spherical curvature and radial heterogeneity in dislocation studies-for a point dislocation

Details Effects of earth's spherical curvature and radial heterogeneity in dislocation studies-for a point dislocation Effects of earth's spherical curvature and radial heterogeneity in dislocation studies-for a point dislocation

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29l..46s&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 12, pp. 46-1, CiteID 1605, DOI 10.1029/2001GL014497

Physics

5

Geodesy And Gravity: Seismic Deformations (7205), Geodesy And Gravity: General Or Miscellaneous, Geodesy And Gravity: Earth'S Interior-Dynamics (8115, 8120), Global Change: Solid Earth, Seismology: General Or Miscellaneous

Scientific paper

To the present, dislocation theories for a homogeneous half-space are often used to calculate or interpret displacements and gravity changes caused by an earthquake or to inverse a seismic fault model. However, far-field effects of spherical curvature and radial heterogeneity have to be considered. In this research, Okada [1985] and Sun et al. [1996] dislocation theories are used to calculate displacements caused by four independent dislocations in three earth models: a homogeneous half-space, a homogeneous sphere, and a heterogeneous sphere. Effects of spherical curvature and radial heterogeneity are investigated through comparison of displacements. Results show that effects of both sphericity and stratification are very large. The stratified effect reaches a discrepancy of more than 25% everywhere on the surface of the earth, including the near field.

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