Editorial comment by Zadig
The capital of the province of the Hellespont, Cyzicus, was ruined by a large earthquake. Malalas dates it to 10 November in an unspecified year during the reign of Hadrian (117-138). Ambraseys connects Malalas’ earthquake with a passage from the Chronicon Paschale (PG 92, p. 615) which does not mention the earthquake, but only Hadrian’s construction programme in Nicomedia, Nicaea and Cyzicus, which is dated to 123. The construction programme of Hadrian began soon after his progress through Asia Minor in 124. According to Ambraseys, to have merited imperial assistance, Cyzicus must have been struck by the earthquake only shortly before, so probably on 10 November 123.
Guidoboni, who syncretises this event with the one in Nicomedia in 120, links it with two passages from the Sibylline Oracles mentioning a tsunami and an earthquake affecting both Cyzicus and Cibyra.
Guidoboni, Catalogue of ancient earthquakes in the Mediterranean area up to the 10th century, 1994, p. 233-234
Ambraseys, Earthquakes in the Mediterranean and Middle East, 2009, p. 126