Erzincan Earthquake

In the final days of December 1939, a magnitude 7.8 earthquake struck eastern Turkey and almost completely destroyed the city of Erzincan, killing more than 30,000 people. It remains one of the deadliest earthquakes in the country's modern history. It also proved to be a turning point, because it exposed the vulnerability of the young republic's building stock and helped shape Turkey's later approach to seismic risk and reconstruction.

Erzincan sits in a broad basin in the upper Euphrates region, along the North Anatolian Fault, a long strike-slip fault that runs across northern Turkey in a way broadly comparable to California's San Andreas. The fault marks the boundary where the Anatolian plate slides westward relative to the Eurasian plate, and the area had been struck by destructive earthquakes before. Erzincan itself had been damaged by earlier shocks in past centuries. In 1939, however, much of the town was built of mud brick, rubble masonry and other materials that performed poorly when shaken, and the soft sediments of the basin are generally thought to have worsened the effects of ground motion.

The earthquake struck at night, in the cold of winter, when most residents were indoors. Buildings collapsed across the city, and the surrounding region suffered heavy damage too. The rupture is estimated to have extended for around 300 kilometers along the fault, producing visible surface breaks. Death tolls vary by source, but most accounts place them above 30,000. Survivors faced freezing temperatures, heavy snow and disrupted communications, which complicated rescue and relief efforts in a remote region with limited transport. Aftershocks and later storms added to the hardship.

The quake was the first in a remarkable sequence. Over the following decades, a series of large earthquakes ruptured the North Anatolian Fault progressively from east to west, a pattern that seismologists have studied closely. The 1999 İzmit and Düzce earthquakes are often seen as later chapters of this migration toward the Istanbul region.

In the aftermath, authorities decided that Erzincan would be rebuilt, but on a different site. The new city was laid out nearby, with planned streets and more modern construction. The disaster also contributed to early Turkish thinking about earthquake-resistant building and disaster management, though enforcement of building standards remained a problem for decades. Erzincan was struck again in 1992, a reminder that the hazard persists.