(A) Examples of critical fault lengths for thrust and normal faults as a function of burial depth for |$\beta = 0.5^\circ$|⁠, |$10^\circ$|⁠, |$20^\circ$|⁠. (B) Normalized stressing rates |$(2\pi L)(\dot{\tau }_E - \mu \dot{\sigma }_E) / (G^{\prime } \Delta v)$| for thrust and normal faults. For both panels the sense of slip is indicated by colours as shown in the legend in panel B.