Figure 4: Two types of seafloor polygonal structure observed in the study area.
From: Current rates and mechanisms of subsea permafrost degradation in the East Siberian Arctic Shelf
(a) A high-resolution side-scan sonar image showing a type of polygonal structure, which represents a regularly shaped depression surrounded by a raised shaft; (b) a high-resolution side-scan sonar image showing a type of polygonal structure characterized by a regular pattern consisting of raised oval-like shapes.
