A 6.0-magnitude earthquake hit off the Solomon Islands in the early hours today. <br/><br/>The US Geological Survey said the quake struck at 02:43 am local time at a depth of 4.0 kilometres (2.5 miles), some 170 kilometres north-northeast of the capital city Honiara. No tsunami warning was issued.<br/><br/>The Solomon Islands are part of the Pacific "Ring of Fire", a zone of tectonic activity known for frequent quakes and volcanic eruptions. In 2007, an 8.0-magnitude quake in the Solomon Islands claimed 52 lives and left thousands homeless when it created a 10-metre tsunami.