September 23, 1063 Earthquake: Istanbul,trakya, Erdek, Iznik, Turkey

1063 or 23 Sept 1064. 40.4 N 28.9 E, intensity VIII, Istanbul, Trakya, Erdek, Iznik (reference #1071)

1064 Sep 23. 40.4 N 28.9 E, intensity VIII (reference #1149)

AD 1063 Sep 23 Marmara. This was a rather large earthquake in the Sea of Marmara that caused considerable destruction in the districts within an area demarcated by Tekfrdag, Erdek and the Dardanelles […] In Constantinople the shocks caused general panic and some damage. There is no record of any deaths. Aftershocks continued to be felt in Constantinople for two years. Most probably the shocks originated in the Sea of Marmara off the shore of Cyzicus. The principal source for this event is Attaliates, a contemporary. He dates the beginning of the earthquake very precisely to a.M.Byz.. 6572, in the second indiction, on 23 September. All these elements are completely consistent and give 23 September 1063. (reference #1063)

1063 Sep 23. This was a severe earthquake that spread desolation particularly along the north coast of the Sea of Maramara, and ruined many districts which lay between Constantinople and the Dardanelles. The walls of towns, aqueducts, churches and public buildings, were thrown down throughout all southern Thrace particularly at Myriophyto(Miirefte), Panion (n.Barbaros) and Redestos(Tekirdag). Damage extended to Nicaea(Iznik) where the walls of the great church where the First Council of Churches had assembled were crumbled to their foundations. In Constantinople, houses were ruined and a few public buildings were damaged or destroyed. The earthquake caused the collapse of the remains of the temple of Hadrian at Cyzicus (n.Erdek). Aftershocks continued to be felt in Constantinople for two years. Most probably the shock originated from the Sea of Marmara offshore Cyzicus. (reference #14000)