Symmetry of the Aegean Sea

The Aegean Sea is a famous part of the Mediterranean, where the African Tectonic Plate meets with the Eurasian Tectonic Plate. Description of the geological features can be seen here: https://en.wikipedia.org/wiki/Aegean_Sea_Plate

Apart from the deep understanding the Aegean Sea geology already found in scientific articles, the convection rolls pattern tells an untold story. The two trenches (Hellenic Trench and Strabo Trench) are accurately symmetrical, as shown here, aligned 46.4° from north. A closer look would lead to the conclusion that the edges sway a bit. The alignment can actually be pinpointed with calculation, being the alignment (from east and west respectively) of a tectonic roll of the relevant latitude divided with two. The central axis is formed in between convection rolls division lines, marked with intersection point of the northern part of the Sea.

The Mediterranean Sea is characterized by north-south oriented convection rolls, and along the 32nd parallel, the alignment er exactly N-S. This leads to the rather unique symmetry of the Aegean Sea.

The relevant convection rolls are shown superimposed on the Google Earth map. Red lines stand for upwelling between rolls, blue lines stand for downwelling. The upper set of rolls is drawn with slightly wider lines, the lower convection rolls have thinner lines for marking the divisions between them.