A series of strong earthquakes struck off the Solomon Islands in rapid succession on Sunday, seismologists said, but no damage was reported and no tsunami warnings were issued.

The strongest of the three tremors, at 5:58 am (1858 GMT Saturday) had a magnitude of 6.1, with the other two each measuring 5.1, according to the US Geological Survey.

The quakes occurred within 30 minutes of one another at depths of 10 kilometres to 36 kilometres, some 600 kilometres (370 miles) from the Solomon Islands capital Honiara.

It was the fifth time in four days that an earthquake with a magnitude of over 6.0 has struck in the region.

On Saturday, Australian seismologists recorded a tremor measuring 6.6, followed by a series of smaller aftershocks. The US Geological Survey put it at 6.3, at a depth of 19 kilometres.

Two earlier tremors clocked in at 6.1, while another measured 6.4.

The Solomon Islands are part of the "Ring of Fire", a zone of tectonic activity around the Pacific Ocean that is subject to earthquakes and volcanic eruptions.

In 2007 a tsunami following an 8.1-magnitude earthquake killed at least 52 people in the Solomons and left thousands homeless.

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Series of quakes hit off Solomon Islands