The quake struck at 9:43 am (2143 GMT) on the coast of the Kamchatka peninsula, about 400 kilometres (250 miles) northeast of regional capital Petropavlovsk-Kamchatsky, at a depth of 9.3 kilometres, the USGS said.

A spokeswoman of the Kamchatka region's emergency situations ministry told AFP that there was no damage from the quake, whose epicenter was 50 kilometres south of the nearest village, Ust-Kamchatsk.

She gave a magnitude of 6.4 and said the quake's depth was 33 kilometres.