This program calculates the deformation that occurs on the surface of an elastic body when slip displacement occurs along the fault plane in the direction of inclination on a flat, tilted longitudinal displacement fault in a homogeneous, isotropic, semi-infinite elastic body.

The formula is based on Mansinha & Smylie (1971). The Poisson's ratio is assumed to be 0.25 for granite. Note that this assumption is not correct for soft ground.

Although this program calculates the vertical displacement of the ground surface in the cross section perpendicular to the fault at the center of the fault, the deformation pattern of the ground surface on pure longitudinal faults is not much different from that at the center of the fault (Matsu'ura and Sato, 1975), so it can be applied to deformation other than at the center of the fault. However, it cannot be used when there is an opening crack or an oblique displacement component. If the fault plane is bent or the amount of slip on the fault changes, please use the five-section reverse fault model.

The WEB version of the five-section reverse fault model is under construction.