A strong 5-magnitude tremor hit just west of the Greek island of Kefalonia in the Ionian Sea in the early hours of Nov. 9, less than two days after the quake-prone island was hit with a previous shaking.
The quake, which hit at 1.15 a.m. local time, had its epicenter 5 kilometers underwater, the Athens Geodynamic Institute reported.
There were no immediate reports of damage or injuries. A 4.7-magnitude quake had hit the island on Nov. 7.
The area often produces very strong quakes. The island was flattened in 1953 by a 7.2-magnitude tremor and earlier this year suffered a strong jolt that caused a lot of damage.