The 1983 Biga earthquake hit northwestern Turkey on 5 July 1983.

It measured 6.1 on the surface-wave magnitude scale and was felt as far away as eastern Greece.

[3] The Biga Peninsula is an area marked by active faults including strike-slip movement and en echelon divergent basins.

The earthquake was preceded by a foreshock nearly a year prior, and was followed by aftershock clusters.

Several houses collapsed, an additional 85 damaged, water mains broke and windows shattered.