Figure 8. Interpretive scheme of seismic line 87775 across the northern Knipovich Ridge. Half graben west of the rift valley displays a thick (up to 2 km) sedimentary assemblage subdivided into two seismic sequences separated by unconformity, as inferred from seismic signature and velocity parameters. 1 - Sedimentary rocks, 2 - Oceanic basaltic basement, 3 - Fault, 4 - Selected reflectors, 5 - Unconformity.