A moderate earthquake struck off the coast of Indonesia on Wednesday in the Molucca Sea, seismologists said, but there was no tsunami alert or immediate reports of damage. The US Geological Survey said a 5.2-magnitude quake struck at 4:32 am (2032 GMT Tuesday), at a shallow depth of 10 kilometres (six miles) and was centred 244 kilometres west southwest of Ternate, Moluccas. Indonesia sits on the Pacific 'Ring of Fire', where the meeting of continental plates causes high volcanic and seismic activity. 