A strong 6.4-magnitude earthquake struck off Fiji on Saturday, U.S. seismologists said, but it was considerably deep and there were no reports of damage or injury.

The offshore quake hit at 3:00 p.m. (0200 GMT) and was centred around 287 kilometres (178 miles) east of Suva, at a depth of 538 kilometres, the U.S. Geological Survey (USGS) said.

The Hawaii-based Pacific Tsunami Warning Center did not immediately issue any warnings. The quake occurred in the so-called Pacific Ring of Fire, a region of frequent seismic activity due to collisions between continental plates.