The coastline of Thera before and after the eruption of the volcano.

Druitt, T.H. & Francaviglia, V., An Ancient Caldera Cliff Line at Phira and its Significance for the Topography and Geology of Pre-Minoan Santorini, in: Hardy, D.A. et al. (eds.), Thera and the Aegean World III, Vol. 2: Earth Sciences, Proceedings of the Third International Congress, Santorini, Greece, 3-9 September 1989, The Thera Foundation, London 1990, III:2, p. 367, ill. 4.

ŠThe Thera Foundation
FHW Image processing