1668 North Anatolia earthquake in the context of 2023 Turkey–Syria earthquake
On 6 February 2023, at 04:17:35 TRT (01:17:35 UTC), a moment magnitude (Mw ) 7.8 earthquake struck southern and central Turkey and northern and western Syria. The epicenter was 37 km (23 mi) west–northwest of Gaziantep. This strike-slip shock achieved a Mercalli intensity of XII (Extreme) around the epicenter and in Antakya. It was followed by a Mw 7.7 earthquake, at 13:24:49 TRT (10:24:49 UTC). This earthquake was centered 95 km (59 mi) north-northwest from the first. There was widespread severe damage and tens of thousands of fatalities.
1668 North Anatolia earthquake in the context of 1939 Erzincan earthquake
An earthquake struck Turkey's eastern Erzincan Province at 1:57:23 a.m. on 27 December 1939 local time with a moment magnitude (Mw ) of 7.8 and maximum Mercalli intensity of XII (Extreme). It is tied with the 2023 Turkey–Syria earthquakes as the most powerful earthquake in Turkey to be recorded by instruments. However, it was less powerful than estimates of the 1668 North Anatolia earthquake. This was one of the largest in a sequence of violent shocks to affect Turkey along the North Anatolian Fault between 1939 and 1999. Surface rupturing, with a horizontal displacement of up to 3.7 meters, occurred in a 360 km long segment of the North Anatolian Fault Zone. The earthquake was the most severe natural loss of life in Turkey in the 20th century, with 32,968 dead, and some 100,000 injured.