Twin earthquakes of preliminary magnitude of 5.4 and 5.5 rattled the western Greek port of Patras, seismologists said. There were no immediate reports of injuries or damage.
The Athens-based Institute of Geodynamics said the first quake occurred at 10.25pm Monday (0725 AEDT Tuesday) about 155 kilometres south-west of Athens, and about 40 kilometres outside Patras. The second occurred at 12.15am Monday (0915 AEDT Tuesday), in the same area. "The activity is ongoing but the likelihood of a very strong earthquake is considered to be very slight," Institute director Giorgos Stavrakakis said.
"This is a phenomenon of twin earthquakes or virtually identical magnitude. It's not common but it is well known."