A powerful earthquake with a magnitude of 7.2 on the richter scale struck off Vanuatu early on Friday, sparking a tsunami warning which was later cancelled. <br/> <br/>According to the US Geological Survey the quake hit at 4:14 am local time at a depth of 36 kilometres, 214 kilometres northwest of Luganville. <br/> <br/>In the six hours after the initial tremor, five aftershocks measuring between 5.0 and 6.4 in magnitude shook the area. <br/> <br/>A spokeswoman for Vanuatu's National Disaster Management Office said later, the office had not yet received any reports of major damage from the northern Torba province, which was closest to the quake's centre. <br/> <br/>The Pacific Tsunami Warning Centre said there had been no indication of any tsunami activity generated by the quake.<br/>