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The tremor, with a depth of 10.82 kilometres struck 119 kilometres southwest of Dadali in the Pacific Solomon Islands at 2:31 am local time.
The Hawaii-based Pacific Tsunami Warning Centre said no tsunami warnings were in effect.
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The Solomon Islands sit on the so-called Pacific Ring of Fire, a region of frequent seismic activity due to collisions between continental plates.
A 6.0-magnitude earthquake struck off the Solomon Islands in September but there were no reports of damage and no tsunami warnings were issued.
Here's what you should do during an earthquake
In 2013, the Solomons were hit by a tsunami after an 8.0-magnitude quake, leaving at least 10 people dead and thousands homeless after buildings were destroyed.
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