Sometime between April 23 and April 25, 1928, Karystos was struck by a 3 meter sea-wave or tsunami.The wave, first thought to have been generated by an earthquake is now believed to have been a storm surge.
A sequence of strong earthquakes which occurred in the eastern part of the Gulf of Corinth caused an exceptional sea-wave.
The predominant feature of this wave is that the sea-water disturbance was spread almost everywhere along the north, west and south coasts of the Aegean Sea.
It is not certain whether the wave has not been reported from the eastern part of the Aegean Sea because of lack of instrumentation and/or dissemination of information or because of a real absence of sea-water disturbance. The maximum wave intensity was observed along the north coastline of Crete in the South Aegean.
This event has been reported by several investigators and Ambraseys (1962) has compiled the relevant information Antonopoulos (1980) and Papadopoulos and Chalkis (1984) have reproduced this information in their tsunami lists.
But according to the International Journal of The Tsunami Society, a more reasonable hypothesis is that the sea-wave was caused by atmospheric causes.
The wave source, no matter what the generation mechanism is likely to have been located somewhere in the South Aegean as the wave intensity distribution indicates.
Sources:
International Journal of The Tsunami Society. Vol II Number I, 1993
Ambraseys, N. N., (1962) Data for the investigation of the seismic sea-waves in the Eastern Mediterranean. Bull. Seismol. Sot. Am., 52, 895-913
Papadopoulos, G.A. and Chalkis, B.J., (1984) Tsunamis observed in Greece and the surrounding area from antiquity up to the present times. Mar. Geology, 56, 309-317.