The Mw  6.5 Farsinaj earthquake strikes Iran with a maximum Mercalli intensity of VII, causing at least 1,119 deaths and damaging over 5,000 homes.

The 1957 Farsinaj earthquake struck Hamadan province, Iran on 13 December at 05:15. The moment magnitude 6.5 earthquake struck at a depth of 15 km (9.3 mi). The epicenter of the earthquake was located in the seismically active Zagros Mountains. The mountain range was also the location for several historic earthquakes. The earthquake occurred near two segments of the active strike-slip Main Recent Fault. At least 1,130 people died, including over 700 in the village of Farsinaj. Additional deaths also occurred in Dehasiyab, Sarab, and other villages. The earthquake left an estimated 15,000 homeless; poor weather conditions including a winter storm on 21 December killed another 20 people. Several deadly and damaging aftershocks in that month killed a total of 38 people.

December 13 is the 347th day of the year in the Gregorian calendar; 18 days remain until the end of the year.