1978 Thessaloniki earthquake ( ) occurred on 20 June at . The shock registered 6.5 on the moment magnitude scale , had a maximum Mercalli intensity of VIII ( '' Severe '' ) , and was felt throughout northern Greece , Yugoslavia and Bulgaria . It was the largest event in the area since the 1932 Ierissos earthquake
1932 Ierissos earthquake
1932 Ierissos earthquake
1978 Thessaloniki earthquake