365 Crete earthquake

The 365 Crete earthquake occurred at about sunrise on 21 July 365 in the Eastern Mediterranean, with an assumed epicentre near Crete. Geologists today estimate the undersea earthquake to have been a magnitude 8.0 or higher. It caused widespread destruction in central and southern Greece, northern Libya, Egypt, Cyprus, Sicily, and Spain. On Crete, nearly all towns were destroyed.
The Crete earthquake was followed by a tsunami which devastated the southern and eastern coasts of the Mediterranean, particularly Libya, Alexandria and the Nile Delta, killing thousands and hurling ships inland. The quake left a deep impression on the late antique mind, and numerous writers of the time referred to the event in their works.
Geological evidence.
Recent (2001) geological studies view the 365 Crete earthquake in connection with a clustering of major seismic activity in the Eastern Mediterranean between the fourth and sixth centuries 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 of the island of Crete, which is estimated to correspond to a seismic moment of , or 8.6 on the moment magnitude scale. An earthquake of such a size exceeds all modern ones known to have affected the region.
Carbon dating shows that corals on the coast of Crete were lifted and clear of the water in one massive push. This indicates that the tsunami of 365 was generated by an earthquake in a steep fault in the Hellenic Trench near Crete. 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 this could happen every 800 years or so. It is uncertain whether "one of the contiguous patches might slip in the future."
Literary evidence.
Historians continue to debate the question whether ancient sources refer to a single catastrophic earthquake in 365, or whether they represent an historical amalgamation of a number of earthquakes occurring between 350 and 450. The interpretation of the surviving literary evidence is complicated by the tendency of late antique writers to describe natural disasters as divine responses or warnings to political and religious events. In particular, the virulent antagonism between rising Christianity and paganism at the time led contemporary writers to distort the evidence. Thus, the Sophist Libanius and the church historian Sozomenus appear to conflate the great earthquake of 365 with other lesser ones to present it as either divine sorrow or wrath—depending on their viewpoint—for the death of Emperor Julian, who had tried to restore the pagan religion two years earlier.
On the whole, however, the relatively numerous references to earthquakes in a time which is otherwise characterized by a paucity of historical records strengthens the case for a period of heightened seismic activity. Kourion on Cyprus, for example, is known to have been hit then by five strong earthquakes within a period of eighty years, leading to its permanent destruction.
Archeology.
Archeological evidence for the particularly devastating effect of the 365 earthquake is provided by a survey of excavations which document the destruction of most late antiquity towns and cities in the Eastern and Southern Mediterranean around 365.
Tsunami.
The Roman historian Ammianus Marcellinus described in detail the tsunami that hit Alexandria and other places in the early hours of 21 July 365. His account is particularly noteworthy for clearly distinguishing the three main phases of a tsunami, namely an initial earthquake, the sudden retreat of the sea and an ensuing gigantic wave rolling inland:
The tsunami in 365 was so devastating that the anniversary of the disaster was still commemorated annually at the end of the sixth century in Alexandria as a "day of horror".
Gallery.
Effects of the earthquake visible in the ancient remains:
Further reading.
Literary discussion on sources and providentialist tendencies
Geological discussion