The Tjörnes Fracture Zone accommodates right-lateral transcurrent motion between two segments of the Mid-Atlantic Ridge near northern Iceland (Figure 1). Portions of the Tjörnes Fracture Zone are exposed on land on the peninsulas of Flateyjarskagi, Tjörnes, and Tröllaskagi along the northern coast. This subaerial exposure presents an opportunity to study active oceanic transform tectonics on land, keeping in mind the atypical effects of the mantle plume beneath Iceland (Hardarson et al., 1997;Wolfe et al., 1997). The Tjörnes Fracture Zone has been studied extensively to improve understanding of tectonics in Iceland (