The 1893 Quchan earthquake occurred at about 19:30 local time (15:06 UTC) on 17 November. It had an estimated magnitude of 6.6 on the surface wave magnitude scale and a maximum perceived intensity of X (Intense) on the Mercalli intensity scale. It caused severe damage in Quchan County, particularly to the town of Quchan itself and there were an estimated 18,000 casualties.