A strong earthquake with a preliminary magnitude of between 5.9 and 6.1 has hit the western Greek island of Kefalonia, just over a week after a similar quake damaged dozens of buildings across the island.

The Athens Geodynamic Institute registered Monday's pre-dawn quake at 5.9, while the U.S. Geological Survey registered a 6.1-magnitude. It is common for different institutes to record slightly different figures.

It was not immediately clear whether there was any damage or injuries.

Thousands of residents have been spending nights with relatives or in ships sent for that reason after a magnitude-5.9 temblor on Jan. 26 damaged thousands of buildings and slightly injured seven people on the island.

Monday's quake was felt on the nearby island of Zakinthos and parts of the western Greek mainland.