CRUSTAL DEFORMATION DUE TO NONUNIFORM SLIP ALONG A LONG FAULT

The problem of the static deformation of a homogeneous, isotropic, per fectly elastic half-space caused by non-uniform slip along vertical st rike-slip and dip-slip faults of infinite length and finite depth is s tudied. Four slip profiles are considered: elliptic b = b0(1 - h2/L2)1 /2; parabolic b = b0(1 - h2/L2); linear b = b0(1 - h/L); and cubic b = b0(1 - h2/L2)3/2; where b is the slip at depth h, b0 is the surface s lip and L is the fault depth. The deformation corresponding to the fou r non-uniform slip profiles is compared with the deformation due to a uniform slip, assuming the source potency integral-L/0 b(h)dh to be th e same. The parity in source potency is achieved by varying the fault- depth L, keeping the surface-slip b0 constant. Contour maps showing th e displacement and stress fields around a long, vertical, strike-slip fault are also obtained. It is found that the effect of the non-unifor mity of slip on the subsurface deformation is significant in the near field. The surface deformation is affected by the non-uniformity to a lower extent.