Effect of a compliant fault zone on the inferred earthquake slip distribution

摘要: [1] We present a new semi-analytic method to evaluate the deformation due screw dislocation in arbitrarily heterogeneous and/or anisotropic elastic half plane. The employs integral transformations reduce governing partial differential equations Fredholm equation of second kind. Dislocation sources, as well spatial perturbations properties are modeled using equivalent body forces. solution is obtained Fourier domain successive over-relaxation, and mapped into inverse Fast Transform. apply this investigate effect soft damage zone around an earthquake fault on co-seismic displacement field, slip distribution inferred from inversions geodetic data. In presence kilometer-wide with reduction effective shear modulus factor 2, that assume laterally homogeneous model tend underestimate amount middle seismogenic layer by much 20%. This bias may accentuate maxima seismic moment release at depth between 3–6 km suggested previous studies large strike-slip earthquakes.