The under-sea quake struck at 5:19 A.M. Local time and sparked a tsunami alert, although no damage is expected due to its depth of 171-km, according to the Pacific Tsunami Warning Centre.
"A destructive tsunami was not generated, based on earthquake and historical tsunami data," the centre said.
The quake comes 12 days after a similar 6.5-magnitude earthquake struck the area, at a depth of 205-km.
Tonga, almost 2,000-km northeast of New Zealand, lies on the so-called Pacific "Ring of Fire", where continental plates collide causing frequent seismic activity.
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