The 2003 Altai earthquake, or 2003 Chuya earthquake, occurred on September 27, 2003, at 18:33 local time (11:33 UTC). The epicenter was in Altai Republic, Russia and was close to the borders of Mongolia, China, and Kazakhstan. The magnitude was put at M_w 7.3 and the depth 18 km. It was felt in a wide range of southern Siberia, and the intensity was MM V in Novosibirsk. 300 houses were destroyed. It was the strongest earthquake in this region since an estimated 7.7 earthquake on December 20, 1761. This earthquake occurred in a segmented fault zone which had not been previously recognized.