The 479 BC Potidaea tsunami is the oldest record of a

tsunami A tsunami ( ; from ja, 津波, lit=harbour wave, ) is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake. Earthquakes, volcanic eruptions and other underwater explo ...

in human history.Smid, T. C.: "'Tsunamis' in Greek Literature", ''Greece & Rome'', 2nd Ser., Vol. 17, No. 1 (April 1970), pp. 100–04 (102f.) The tsunami is believed to have been triggered by a 7.0

earthquake An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in intensity, from ...

in the north

Aegean Sea The Aegean Sea ; tr, Ege Denizi (Greek language, Greek: Αιγαίο Πέλαγος: "Egéo Pélagos", Turkish language, Turkish: "Ege Denizi" or "Adalar Denizi") is an elongated embayment of the Mediterranean Sea between Europe and Asia. It ...

. The associated tsunami may have saved the colony of

Potidaea __NOTOC__ Potidaea (; grc, Ποτίδαια, ''Potidaia'', also Ποτείδαια, ''Poteidaia'') was a colony founded by the Corinthians around 600 BC in the narrowest point of the peninsula of Pallene, the westernmost of three peninsulas at ...

from an invasion by Persians from the

Achaemenid Empire The Achaemenid Empire or Achaemenian Empire (; peo, 𐎧𐏁𐏂, , ), also called the First Persian Empire, was an ancient Iranian empire founded by Cyrus the Great in 550 BC. Based in Western Asia, it was contemporarily the largest em ...

Tectonic setting

The

is a seismically active region with complex plate tectonics interaction both within and surrounding the

Aegean Sea Plate The Aegean Sea Plate (also called the Hellenic Plate or Aegean Plate) is a small tectonic plate located in the eastern Mediterranean Sea under southern Greece and western Turkey. Its southern edge is the Hellenic subduction zone south of Crete, ...

. Seismicity in the Aegean Sea is due to active extension within the lithospheric plate. The Aegean Sea Plate is defined along several major plate boundaries including the

North Anatolian Fault The North Anatolian Fault (NAF) ( tr, Kuzey Anadolu Fay Hattı) is an active right-lateral strike-slip fault in northern Anatolia, and is the transform boundary between the Eurasian Plate and the Anatolian Plate. The fault extends westward fro ...

which runs through northern Turkey, where the Anatolian Plate slides past the

Eurasian Plate The Eurasian Plate is a tectonic plate that includes most of the continent of Eurasia (a landmass consisting of the traditional continents of Europe and Asia), with the notable exceptions of the Indian subcontinent, the Arabian subcontinent and ...

along this right-lateral

strike-slip In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic ...

fault. The southern margin is dominated by active convergence of the African Plate. It converges north towards the Aegean Sea Plate at a rate of 5–10 mm/yr. The subduction rate along the

Hellenic subduction zone The Hellenic subduction zone (HSZ) is the convergent boundary between the African Plate and the Aegean Sea Plate, where oceanic crust of the African is being subducted north–northeastwards beneath the Aegean. The southernmost and shallowest part ...

at 35 mm/yr, however, greatly exceeds the velocity of the African Plate. North–south extension within the Aegean Sea Plate in the

back-arc region The back-arc region is the area behind a volcanic arc. In island volcanic arcs, it consists of back-arc basins of oceanic crust with abyssal depths, which may be separated by remnant arcs, similar to island arcs. In continental arcs, the back-ar ...

compensates the subduction rate. Shallow crustal earthquakes within the Aegean Sea Plate is a result of this

extension Extension, extend or extended may refer to: Mathematics Logic or set theory * Axiom of extensionality * Extensible cardinal * Extension (model theory) * Extension (predicate logic), the set of tuples of values that satisfy the predicate * E ...

, accommodated by east–west trending normal faults.

Earthquake

The 7.0 earthquake had an epicenter somewhere in Macedonia. It was given a maximum Mercalli intensity of IX (''Violent'').

Tsunami

During the

Persian Persian may refer to: * People and things from Iran, historically called ''Persia'' in the English language ** Persians, the majority ethnic group in Iran, not to be conflated with the Iranic peoples ** Persian language, an Iranian language of the ...

siege of the sea town Potidaea, Greece,

Herodotus Herodotus ( ; grc, , }; BC) was an ancient Greek historian and geographer from the Greek city of Halicarnassus, part of the Persian Empire (now Bodrum, Turkey) and a later citizen of Thurii in modern Calabria ( Italy). He is known f ...

reports how Persian attackers who tried to exploit an unusual retreat of the water were suddenly surprised by "a great flood-tide, higher, as the people of the place say, than any one of the many that had been before". Herodotus attributes the cause of the sudden flood to the wrath of

Poseidon Poseidon (; grc-gre, Ποσειδῶν) was one of the Twelve Olympians in ancient Greek religion and myth, god of the sea, storms, earthquakes and horses.Burkert 1985pp. 136–139 In pre-Olympian Bronze Age Greece, he was venerated as a ch ...

. The large tsunami was observed in the

Toronean Gulf The Toronean Gulf or Toroneos Gulf () and Toronaic Gulf (), also known as the Kassandra Gulf (), is a gulf of the Thracian Sea, part of the northern Aegean Sea, in Chalkidiki, Greece. It lies between the Kassandra peninsula in the west, and Sit ...

which devastated Potidaea. The tsunami sank multiple Persian ships attempting to invade the colony, drowning several hundred soldiers. The source of the tsunami is still controversial with its origins attributed to meteorological effects or a submarine landslide. Historical documents did not mention the occurrence of a storm however.

References

{{coord missing, Greece Earthquakes in Greece Tsunamis in Greece 479 BC 1st-millennium BC natural events

Tectonic setting

Earthquake

Tsunami

See also

References