[[:file:evaluating-top-and-fault-seal_fig10-38.png|Figure 1]] is a simple [[cross section]] of a low-relief salt structure showing three seismic sequences. The figure shows how strain is calculated: by comparing the original undeformed line length with the deformed line length between two arbitrary points, A and B. In this figure, 1<sub>0</sub> is the initial, undeformed line length; 1<sub>1</sub> is the deformed line length of the 60-m.y sequence boundary; and 1<sub>2</sub> is the deformed line length of the 131-m.y. sequence boundary. The strain (ε) on the 131-m.y sequence boundary is ε = (1<sub>2</sub> – 1<sub>0</sub>)/1<sub>0</sub> = 2.5%. The strain on the 60-m.y. sequence boundary is ε = (l<sub>1</sub> – 1<sub>0</sub>)/1<sub>0</sub> = 0.5%. All strains are extensional. | [[:file:evaluating-top-and-fault-seal_fig10-38.png|Figure 1]] is a simple [[cross section]] of a low-relief salt structure showing three seismic sequences. The figure shows how strain is calculated: by comparing the original undeformed line length with the deformed line length between two arbitrary points, A and B. In this figure, 1<sub>0</sub> is the initial, undeformed line length; 1<sub>1</sub> is the deformed line length of the 60-m.y sequence boundary; and 1<sub>2</sub> is the deformed line length of the 131-m.y. sequence boundary. The strain (ε) on the 131-m.y sequence boundary is ε = (1<sub>2</sub> – 1<sub>0</sub>)/1<sub>0</sub> = 2.5%. The strain on the 60-m.y. sequence boundary is ε = (l<sub>1</sub> – 1<sub>0</sub>)/1<sub>0</sub> = 0.5%. All strains are extensional. |