A moderate earthquake of 5.4 magnitude hit an area in the Ionian Sea off the coast of Greece Sunday without causing casualties or major damage, Greek and US authorities reported. The epicentre of the tremor, which occurred at 1523 PST, was located near the island of Zante, 329 kilometres (203 miles) west of Athens, seismologists at the Athens observatory said. There were no casualties and no significant damage, local authorities said. The quake was felt most strongly on Zante, local police said. The US Geological Survey rated the magnitude as 5.6.