Figure 2. A deformed wireframe illustrates surface folding associated with a thrust fault. On the left, the fault ruptures the surface. On the right, the fault does not reach the surface. The deformation shown in both panels has been exaggerated by a factor of 1,000 to show 2 kilometers of cumulative slip in an elastic medium. Poisson’s ratio has been changed from the 0.25 default to 0.5 so that volume is preserved. This makes cross-sections ‘retrodeformable,’ meaning the deformation can be undone and the strata restored, as generally assumed by geologists for the lithosphere. Credit: Temblor, CC BY-NC-ND 4.0