A 6.6-magnitude quake hit off the west coast of Cyprus early Tuesday, the US Geological Survey said.
The strong and relatively shallow quake was centred 48 kilometres (30 miles) west-northwest of the town of Polis on the Mediterranean island, the USGS said.
There was a low likelihood of casualties and damage from the quake, the USGS said in its preliminary assessment.
Cyprus lies in a secondary earthquake-prone zone, but tremors of such magnitude are uncommon.
The biggest quake in recent years was a magnitude 6.8 in 1996, which killed two people in Paphos along the west coast.