The 1509 Constantinople earthquake, referred to as "The Lesser Judgment Day" (Turkish: Küçük Kıyamet) by contemporaries, occurred in the Sea of Marmara on 10 September 1509 at about 10pm. The earthquake had an estimated magnitude of 7.2 ± 0.3 on the surface wave magnitude scale. Forty-five days of aftershocks followed the earthquake, as well as a tsunami.