is a result of the southwards migration of the subduction zone. This has led to extension both along the line of the arc as it bulged out and extension perpendicular to the arc, which is the current tectonic state. Seismicity The Hellenic arc is one of the most active seismic zones in western Eurasia. It has regularly been the source for magnitude 7 earthquakes in the last hundred years of instrumental recording and the location for at least two historical events that were probably of about magnitude 8 or more, the 365 Crete earthquake and the 1303 Crete earthquake. See also Mediterranean Ridge References External links Megathrust earthquakes in Greece Geology of Greece