The quake badly shook Tezpur, a city of 100,000 people, about 45 kilometres (28 miles) from the epicentre. Residents said many people poured onto the streets and some buildings were damaged.
"I have never experienced anything like this before, I immediately left the house," a citizen in Larissa region, in central Greece, told ERT state television.
The USGS said the magnitude was 6.3, while the European Mediterranean Seismological Centre (EMSC) put it 6.2, revising earlier reports that suggested the tremor was as much as 6.9.
