Geological Evidence
Recent geological studies view the AD 365 Crete earthquake in connection with a clustering of major seismic activity in the eastern Mediterranean between the 4th century and the 6th century AD which may have reflected a reactivation of all major plate boundaries in the region. The earthquake is thought to be responsible for an uplift of 9 m of the island of Crete, which is estimated to correspond to a seismic moment of ~10^29 dyne cm. An earthquake of such a size exceeds all modern ones known to have affected the region. However, a recent reassessment of radiocarbon data indicates that the uplift most probably took place at a later date.
Researchers at the University of Cambridge recently carbon dated corals on the coast of Crete which were lifted 10 metres and clear of the water in one massive push. This indicates that the tsunami of AD 365 was generated by an earthquake in a steep fault in the Hellenic Trench near Crete. The scientists estimate that such a large uplift is only likely to occur once in 5,000 years; however, the other segments of the fault could slip on a similar scale—and could happen every 800 years or so. It is unsure whether "one of the contiguous patches might slip in the future."
Read more about this topic: 365 Crete Earthquake
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