M 5.9 - 4 km SE of Köseköy, Turkey
- 1999-09-13 11:55:28 (UTC)
- 40.709°N 30.045°E
- 13.0 km depth
ShakeMap
Six people killed, one died of a heart attack, 422 injured and additional damage in the Adapazari-Golcuk-Kocaeli area. Felt in much of northwestern Turkey.